Surface nano-patterning by ion beam sputtering (IBS) is a bottom-up strategy to produce nanostructures on large areas of a wide range of materials (metals, insulators, semiconductors) in just a few minutes. This technique has been known for many years but its underlying physical mechanisms are still open to discussion. Initially, it was thought that these processes were rather universal, i.e., independent of the specific ion-target combination. However, recent experiments have shown that this is not the case. In particular, this work focuses on the case of an Ar+ or Xe+ ion beam impinging at oblique angles on a silicon surface, which results in the formation of nano-ripple patterns provided that the angle of incidence is above some threshold value. The paper is both an experimental and a theoretical study of the mechanisms which may govern the nano-ripple formation. We have characterized by AFM the dependence of the morphology of the ripple pattern on the ion species employed. In addition, we have studied by TEM the thickness of the amorphized surface layer that appears due to irradiation and the interface between this layer and the bulk, undamaged, silicon. These results have been used to develop a multiscale theoretical approach, which combines molecular dynamics simulations with a continuum, viscous flow model. From this model we show that the non-uniform generation of stress across the damaged amorphous layer is a key factor behind the range of experimental observations. Moreover, as the form of the stress field is controlled by the ion/target combination, this mechanism can account for the experimental observations on the influence of such combination in the properties of the ripple pattern. This work has been made through a collaboration with other researchers of ICMM, Universidad Carlos III de Madrid, Universidad Autónoma de Madrid, and Universidad Pontificia Comillas.
A deep and detailed understanding of the organic molecule – substrate interaction at the nanoscale is essential in order to develop a real nanoelectronic technology. The combination of Organic molecules and TiO2 surface is becoming a hot topic due to the extended use in novel photovoltaic devices. With this in mind, our group has studied several organic molecules on TiO2(110) surfaces. Thus, fullerenes, C60H30, Pentacene or PTCDI were studied by a combination of experimental and theoretical tools. Now, we expand that works in collaboration with the group of Luca Floreano (ALOISA beamline at Elettra synchrotron) by deeply characterizing Perylene, a prototypical molecule, on TiO2(110)-1×1. By a combination of STM and UPS experiments together with an accurate “many-body” corrected ab initio calculations we showed that the molecular coupling and adsorption configuration strongly depend on the coverage.
- – At low coverage, the surface-molecule interaction is dominated by van der Waals interactions. Perylene adsorb between Obr of the TiO2 surface with their large axis along the  crystallographic direction.
- – At high coverage the molecules self-organize forming large ordered domains. Under these conditions the interaction between molecules is found to be mediated by a strong side-to-side intermolecular hybridization.
The work has been published in J. Phys. Chem. C 2015, 119, 7809-7816
One of the most extended approaches in order to growth metal-organic nanostructures on surfaces consists in recombine small organic molecules with a carefully controlled quantity of metallic atoms on a surface. As an example, our group followed this strategy in previous works for obtaining a rich variety of nanostructures by combining PTCDA molecules with Fe atoms on Au(111). On the contrary, in this work we explored a different approach. We directly sublimated under UHV conditions a large metal-organic cluster [Cu4(m3-Cl)4(m-pym2S2)4](pym2S2 = dipyrimidinedisulfide) which spontaneously self-organize on the Cu(110) surface. We showed that the Cu4Cl4 metallic core maintains its molecular integrity during the process. Furthermore, the obtained structures are laterally stabilized by a p-p intermolecular interaction. The methodology described in this work opens the door for the synthesis of new (multi-)functional nanostructures based on large metal-organic precursors.
It has been published in the journal Chem. Commun. 51, 3243-3246 (2015)
One of the most important research lines carried out by the ESISNA group is devoted to the characterization by the most advanced Surface Science techniques of the deposition of organic molecules on metal and metal oxide surfaces towards the formation of new molecular nanoassemblies and other hierarchical nanostructures. Following this line, our group already shown that the deposition of C60 on the rutile TiO2(110)-(1 × 1) surface presents a well-ordered p(5 × 2) surface phase. Very recently, and motivated by this latest work, a step forward has been given and we have identified another crystallographic phase on this surface characterized by a large unit cell containing four C60 molecules. This phase, which exhibits four inequivalent C60 adsorption sites with just two different molecular orientations, is herein explained in terms of an accumulation of the so-called antiphase boundaries. Among the a priori ten possible antiphase boundary domains, only three of them can result in possible long-range structures attending to geometrical and energetic considerations. In order to fully characterize the structure and energetics of this new C60/TiO2(110)-(1 × 1) phase, an adequate combination of STM and accurate density functional theory based calculations, including an efficient self-consistent implementation of the vdW interaction, has been used. Results suggest that this new phase is the most stable among all the possible antiphase boundary domains. On the other hand, this work rationalizes and enforces the idea of the prevalence of the intermolecular vdW over the molecule–substrate interactions in this particular organic–inorganic interface, which sets TiO2 as an ideal substrate for decoupled systems.
The results have been published in J. Phys. Chem. C, 118, 27318 (2014)
Researchers in Spain have designed a vacuum chamber capable of mimicking conditions on Mars to test gear for use in future missions
SOURCE: WASHINGTON, March 25, 2014 /PRNewswire-USNewswire
A research team in Spain has the enviable job of testing out new electromechanical gear for potential use in future missions to the “Red Planet.” They do it within their Mars environmental simulation chamber, which is specially designed to mimic conditions on the fourth planet from the sun — right down to its infamous Martian dust. Mars is a key target for future space exploration, thanks to indications that the planet may have either been capable of supporting life in the past or is possibly even supporting it right now within its subsurface. To answer the many questions about the habitability of Mars, it’s critical to first develop new sensors and instruments capable of detecting the planet’s atmospheric and surface characteristics. In the journal Review of Scientific Instruments, which is produced by AIP Publishing, researchers from Centro de Astrobiología, INTA-CSIC, and Instituto de Ciencias de Materials deMadrid describe their work mimicking conditions on Mars. “Mars is a good place to learn about planets similar to ours and, as such, is the target of many NASA and European Space Agency missions,” explained José Ángel Martín-Gago, a research professor at the Instituto de Ciencias de Materials de Madrid. “Our group is primarily involved in the Mars Science Laboratory mission to construct a meteorological station intended for future use on a rover to further explore Mars’ surface.” By building here on Earth state-of-the-art vacuum chambers capable of reproducing the physical conditions of Mars — including temperature, pressure, gas composition, and radiation — the researchers can experimentally mimic these conditions to test instrumentation in “real” environmental operation conditions. Vacuum chambers have already enabled the researchers to test some of the meteorological sensors currently used onboard the Curiosity rover, which is exploring the surface of Mars. But they are now turning their attention to other challenges, such as Martian dust. “We’re simulating the effect of the Martian dust — one of the primary problems for planetary exploration — to gain a better understanding of how instruments behave when covered in dust,” said Jesus Sobrado, the scientist in charge of the machine’s technical development. As part of its research effort, the team has designed and built vacuum chambers devoted to simulating spatial environments, such as the surface of other planets like Mars’ surface or even Jupiter’s icy moon Europa, the interstellar medium, and interplanetary regions. Vacuum chambers can “answer many questions about Mars or other related planetary bodies — both from scientific and technology points of view,” he added. Martín-Gago and colleagues are currently collaborating with NASA on its mission to test the new meteorological station “Temperature and Wind for Insight,” associated with the Insight mission, and are also expected to test the Mars Environmental Dynamics Analyzer and Sign of Life Detector instruments proposed for the next mission to Mars in 2020. The article, “Mimicking Mars: A vacuum simulation chamber for testing environmental instrumentation for Mars” is authored by J.M. Sobrado, J. Martín-Soler, and J.A. Martín-Gago.
It has been published in the journal Review of Scientific Instruments 85, 035111 (2014)
Sequential formation of N-doped nanohelicenes, nanographenes and nanodomes by surface-assisted chemical (cyclo)dehydrogenation of heteroaromaticsmarzo 14th, 2014 | Posted by in News - (Comments Off on Sequential formation of N-doped nanohelicenes, nanographenes and nanodomes by surface-assisted chemical (cyclo)dehydrogenation of heteroaromatics)
The use of appropriately functionalized molecular building blocks to form novel nano-architectures with tailored structure and electronic properties has recently been brought under the spotlight. Recently, the ESISNA group has developed an effective way of exploiting on-surface chemistry to grow different nanostructures in sequential steps from the same molecular precursor. We have used different activation temperatures to control the on-surface C–H bond breaking and C–C bond making processes in the paradigmatic case of the nomplanar helically chiral pyridil-disubstituted dibenzohelicene (1 in figure) deposited on Pt(111).
This molecule experiences dehydrogenation from different groups at different temperatures.
At 440 K it cyclodehydrogenates, by cleaving some internal C–H bonds, which subsequently close to form additional carbocycles, giving rise to N-doped nanohelicenes (2 in figure). Further annealing at 650 K cyclodehydrogenates the aza-aromatic groups to form N-d oped nanographenes (3 in figure), and finally, at 770 K rim-dehydrogenation leads to N-doped nanodomes (4 in figure) covalently bound to the metal surface. By an efficient combination of the most advanced room temperature (RT) ultra-high vacuum scanning tunneling calculations based on improved density functional theory (DFT), the sequential development microscopy (UHV-STM) technique with state-of-the-art first-principles of the different resultant structures has been monitored.
Importantly, we have found significant agreement between experimental and calculated STM images of key intermediates, which allows a detailed mapping of the individual steps of this complex on-surface transformation.
This adequate combination of experiments and theory will permit shed some light in any other thermo-induced on-surface reaction of this kind.
The results have been published in Chemical Communication 50, 1555-1557 (2014).
Now we are looking for people to work with us:
ERC-synergy is a call of the European Union for promoting new ideas at the cutting edge of science and technology using challenging approaches.
NANOCOSMOS is an ERC-Synergy grant devoted to study the origin of chemical complexity in space using new strategies. These protocols involve radio-astronomy observations feeding surface-science experiments, and providing ideas and concepts for constructing advanced simulation ultrahigh-vacuum machines, and developing theoretical methodologies. More information about the project in this link.
The ESISNA group is committed to construct the called: STARDUST machine to simulate the production of nanoparticles and molecules in the photosphere of a dying start.
We are looking for people interested in working in this project at all levels:
* Research groups and scientists (including Ramón y Cajal or Marie Curie proposals) interested in join us for specific parts of the project.
*Post-docs and phD students in the fields of surface science modelling for astrochemistry, theoretical modeling, nanoparticle production in UHV, sputtering, synchrotron radiation…
* UHV-Engineering (designing and/or exploiting stardust machine)
*Vacuum technician (formation provided)
The grant will start in july-2014, and it will last for 6 years.
Interested people, please write a motivation letter indicating us which could be your contribution of the project
For application or more information, please contact: nanocosmos at icmm.csic.es
Despite their abundance and ubiquity in space, the origin of polycyclic aromatic hydrocarbons (PAHs) is still a mystery for astronomers. Gas phase chemistry models, this is, simple collisions between C atoms and C-containing molecules, and soot formation mechanisms can not easily account for the observed amount of PAHs, as they contain around 20% of all carbon observed in the photodissociation regions.
In a recent paper, our group propose a new possible mechanism based on surface science results. In our work, appearing in Nature Communications, top-down PAH synthesis is experimentally proven using nanotechnology tools.This can be seen as a sign indicating that the results obtained within the nanoscience framework might be essential in the modern understanding of astrochemistry.
Using advanced in-situ instrumentation we found that high temperature hydrogen etching on graphitized silicon carbide (SiC) surfaces is an efficient path to the formation of PAHs and other related species of hydrocarbons in conditions analogous to those occurring in the circumstellar envelopes of C-rich AGB stars.
Interstellar dust grain SiC crystallites have been found appearing in the chondritic meteorites falling to earth and hydrogen accounts for 70% of all matter in the universe. The abundance of the materials used in the laboratory experiments in different regions of the space renders the newly proposed mechanism as one possible explanation to the PAHs mysterious origin.
The results have been published in Nature Communications 5, 3054 (2014).
The European Research Council (ERC) announced the winners of 13 Synergy Grants, who will share a total of €150 million. The projects, at the crossroads of many disciplines, will receive funding of up to €15 million each for the coming six years. Amongst those projects, we can highlight the “Gas and Dust from the Stars to the Laboratory: Exploring the NANOCOSMOS” project, which involves the ESISNA group.
Our research group has shown the catalytic properties of the TiO2(110)-(1×1) surface towards dehydrogenation of large organic molecules. We have deposited C60H30 molecules on this surface and we have proven that high temperature annealing leads to partial cyclodehydrogenation, which allows the use of the activated PAH’s as building blocks for larger nanostructures. In this way, the formation of fullerene-like nanodomes on this dielectric surface was observed by STM. The different stages of this on-surface chemistry were followed by different experimental techniques (STM, XPS and NEXAFS) and theoretical methods.
Functionalizing epitaxial graphene
We are currently looking for a postdoc in the framework of the EC-Flagship program. The candidate should have proven experience in ultra high vacuum (UHV) and in some of the surface science characterization techniques (STM, LEED, XPS, synchrotron radiation…). IR experience in UHV will be advantageous.
Your application should include a CV and brief motivation letter.
We would like to fill the position soon, to start beginning 2014.
For application or more information, please contact:
Jose A. Martín-Gago; Gago@icmm.csic.es
More information about the group activities available at:
More information about the research institute at:
The bottom-up approach aims at forming tailored nanoarchitectures by manipulating organic molecules at atomic level and it is one of the most effective strategies used in nanotechnology. Catalytic surfaces are often used to prompt a particular reaction as they are very successful in modifying a particular molecule in selected ways. For example, transition metal surfaces are very efficient catalysers of dehydrogenation reactions in Polycyclic Aromatic Hydrocarbon (PAH), usually upon thermal activation. They can act in different ways, depending on the strength of the interaction between the surface and the adsorbate. When a PAH is deposited on a reactive surface, such as Pt(111), the molecule does not diffuse, so the as-deposited molecule sticks where it lands. When this system is annealed, the molecule dehydrogenates which results in an intramolecular transformation, as no intermolecular interaction is allowed as the molecules do not ‘see’ each other. However, when deposited on a weakly reactive surface the precursors diffuse. In this case, the thermal activation allows dehydrogenation and an intramolecular structural transformation; however, as the molecules diffuse they interact with each other, causing also intermolecular covalent bonding. So by simply changing the nature of the surface, we can obtain two completely different outcomes.
The picture shows how the two selected molecular precursor can either transform into N-doped fullerenes or nanographene on a highly reactive surface, where diffusion is prevented (left hand side), or they can react with each other to form covalent chains on a weakly reactive surface (right hand side).
This work has been performed by combining different experimental techniques, such as STM, XPS, NEXAFS (synchrotron radiation based) and DFT theoretical methods.
The results have been published in: ACS Nano 7 (2013) 3676.
Full text in this link:
Valence band electronic structure characterization of the rutile TiO2(110)-(1×2) reconstructed surface, Sanchez-Sanchez, C; Garnier, MG; Aebi, P; Blanco-Rey, M; de Andres, PL; Martin-Gago, JA; Lopez, MF; Surf. Sci., 608, 92 (2013). DOI: 10.1016/j.susc.2012.09.019
Full text in this link:
Small Pt nanoparticles on the TiO2(110)-(1×2) surface, Sanchez-Sanchez, C; Martin-Gago, JA; Lopez, MF;
Surf. Sci., 607, 159 (2013). DOI: 10.1016/j.susc.2012.08.028
Combined LEED-STM-IR in UHV machine
A new UHV machine has been installed in the main laboratory of ESISNA’s Group. The machine combines three powerful techniques: STM at room temperature (the STM apparatus recycled from old machine); LEED (with multichannel-plate especially suitable for studying molecular structures); and Infrared spectroscopy in reflexion combined with PEM spectroscopy. The system is divided in two independent chambers, one for evaporating and STM and the other for LEED and IR. The former one includes a sample manipulator cryostat (we expect to perform LEED and IR at 50 K).
The old equipment, which was working from 1991 has been dismounted. The last experiment was performed by P. Merino on the growth of epitaxial graphene on Pt(111).
The project for the construction of the machine has lasted for 5 years. On 5th November we starting the mounting, and on 11th dicember we are working again on the new machine. Some important Credits: Jesus Sobrado: Global UHV design; Gary Ellis: design of the IR set-up. Gonzalo Otero, Irene Palacio and Paqui Lopez: Main mounting of the new machine. Javier Méndez: New crysostat manufactured by PREVAC; Maques: Mounting of the structure; Vacom: construction of the vacuum chambers.
Graphene and Graphene derivatives are promising nanostructures to create new atomically precise materials. However, to this goal, it is important to functionalize and manipulate the graphene network in order to include specific species that confer new functionalities to the layer. We have used X-Ray Photoelectron Spectroscopy in order to determine the chemical species included into the graphene network in two different approaches:
First we have studied reduced graphene oxide derivatives in collaboration with the Polymer Science and Technology Institute of Madrid (ICTP-CSIC).We have followed Clik-chemistry for functionalizing graphene with a Conjugated Poly (fluorine).
Second, we have studiedtheoxidized graphene species grown by using a new CVD based methodology at the University of Aveiro (Portugal).
The possibility to select molecules with different shapes is one of the most intriguing issues of organic electronics, since it lets us envisage the exploitation of the anisotropy parameter for the design of hybrid archetypal devices. For this reason, we have studied the growth of two organic molecules, whose shape is completely different, on the dielectric TiO2(110)-1×1 surface.
Most of the organic molecules do not interact with the TiO2 surface. Here after we report on two different molecules which are weakly interacting with the surface, forming a physisorbed overlayer.
El congreso de Microscopías de Fuerzas y de Efecto Túenl FyT2012 tendrá lugar en San Lorenzo de El Escorial los días 12, 13 y 14 de Septiembre.
Visita la página http://www.fyt2012.com
Registrate y manda tu abstract antes del 30 de Junio.
Entrevista a Jose Angel Martin Gago publicada en “El Mundo digital”. Por Mónica Luna.
Financed by the Spanish Ministry of Science and Technology
Rolling grant MAT2011-26534 (Reactivity of Organic Molecules on Surfaces, REOMS)
Funding to develop research work in the ESISNA group (ICMM-CSIC) is offered for a person holding a physics/chemistry degree. The successful candidate is expected to work towards his/her PhD around the general subject of reactivity of organic molecules on surfaces, in particular the formation of fullerenes and graphene layers on metals and metal-oxides. The PhD will combine experimental and theoretical work, performing experiments in Ultra-High Vacuum with different Surface Science Techniques (e.g., Variable-Temperature Scanning Tunneling Microscopy), and using ab-initio Density Functional Theory to interpret the experiments.
Interested candidates should send a CV to
– Dr. Javier Mendez (firstname.lastname@example.org), and/or
– Dr. Pedro de Andres (email@example.com).
stating their interests and previous formation. Reference letters will be appreciated.
Deadline: February 2012
IUVSTA World Transfer Programme (WTC) rules:
To aid a recently qualified post doctoral scientist to transfer to another laboratory in another country in order to gain access to instruments (experiments, computers, large infrastructures) and/or to a special expertise, in order to progress more quickly her/his research project. The scientific stay will be of 3 to 12 months duration.
For a short stay, the grant consists of a travel grant but for a longer stay it may also cover some consumables or other discretionary expenses, upon the submission of a detailed budget plan.
Up to 3 years after the award of a PhD (or equivalent)
1) up to 1000 € for covering the cost of one return flight or train ticket (economy class only)
2) up to 2500€, according to the financial plan of the applicant for purchase of consumables, or small scientific equipment (excluding computers or accessories), conference fees and local costs, with a limit of / at a rate of max 250 € per month of stay
3) a special bonus of 500 €, paid to the scientist after acceptance – within 12 months of the stay – of a paper published in a recognized international peer reviewed scientific journal
A simple model to explain graphene Moirés on single crystal metal surfaces
Graphene revealed to be the most outstanding material of the decade. Scanning Tunneling Microscope (STM) images have proved the existence of Moiré superstructures on epitaxial graphene due to the spatial coincidence of the atomic periodicity of the graphene lattice with that of the supporting metal. Formation of Moiré superstructures has been reported on many metals, e.g. Ru, Ir , Rh , Pt , and recently Cu , Pd , Co and Ni . Surprisingly, albeit the huge, recent and still increasing number of papers devoted to this topic, the most fundamental questions about the formation, structure and stability of these Moirés have not been deeply addressed and is still a matter of scientific dispute.
We have addressed this topic by combining a geometrical model with STM images of multidomain epitaxial graphene on Pt(111). Our model predicts the formation of 22 stable superstructures for Pt(111). We have experimentally found 19 of them, which are all predicted by the model. Moreover, by applying this method to published data we can reproduce the Moiré superstructures found for other single crystal metal surfaces and we foresee the existence of other periodicities, which have not been reported yet.
A tutorial Chemical Society Review
On-surface synthesis can be regarded as an efficient means to build new molecular species by using bottom-up strategies. Recently, a collection of different reactions leading to large tailor-made organic molecules on single-crystal metal surfaces has been reported. The fundamental mechanisms controlling these reactions can be investigated from a surface science perspective. This discipline skilfully combines the use of characterization techniques at the nanoscale, with single-crystal metallic surfaces able to catalyse these reactions.Full text in this link: J.Mendez, M. F. Lopez and J. A. Martín-Gago; Chem. Soc. Rev., 2011, 40, 4578–4590
Scholarship Application Deadline Extended to April 30th 2011
The Welch Scholarship provides $15000 support once per year to a promising scholar who wishes to study vacuum science, techniques or their application in any field, and wants to spend a year in a research lab in another country.
This is an excellent opportunity to help offset some costs that may not be covered by other sources of funding, and this year the application deadline has been extended to April 30th. If you know promising candidates or are looking to host such a researcher, please refer to the detailed description and application forms and process on the IUVSTA web site at: http://www.iuvsta.org/iuvsta2/index.php?id=654
Please post of forward this to your colleagues, as appropriate. For any further questions, please contact the firstname.lastname@example.org
New bottom-up strategies for molecular assembly to tailor-build new molecules
The appearance on the technological scene of new electronic devices based on organic molecules is awaited with much expectation since they promise to be inexpensive, flexible, faster and smaller than those based on silicon technology. However, molecular electronics faces important challenges before the jump from the research laboratory to the technological centre can be made. To make this jump one of the new trends in the field aims to assemble organic molecules at specific locations on nanostructured surfaces, where they can subsequently be used as building-blocks for fabricating the active or passive electronic elements of a circuit. Rather than using the current top-down techniques, successfully applied in solid-state electronics, it seems clear that the groundwork for building molecular devices should start with a bottom-up strategy, presently lacking in the molecular engineer’s toolkit…
Roman Fasel and co-workers have shown that is possible to synthesize nanographene, a highly strategic molecule, from less complex polyphenyls, demonstrating the capabilities of this new strategy for bottom-up fabrication, which can be easily extended to the assembly of nanographenes of varying dimensions
Read our complete opinion article in nature chemistry 3,11,2011
Recently published in Chemistry, a European Journal. Vacuum deposition of a planarized PAH, as C60H30 , on a single-crystal surface, as Pt(111), leads to surface induced chirality caused by the different landing side of the molecule, as depicted by in-situ STM images.
We show that the surface discriminate the landing side of an individual molecule. Molecules adsorbed “right” or “left”-hand present different structural geometries, shifted by about 35º between them. Large-scale DFT calculations explain the atomistic mechanism behind the enantiomeric recognition process.
Published in Phys. Rev. Lett. by ESISNA
Graphene is one of the most outstanding materials of the decade. Among all the different proposed applications and protocols to growth it, epitaxial graphene on single-crystal metal surfaces have acquired a significant relevance as a model system where to rationalize their atomic structure, interaction with the support and excellent electronic properties. However, there are still many fundamental incertitudes about their interaction with the supporting substrate.
Here we present a full atomic determination of a new graphene phase with low crystallographic ratio with the substrate. The Pt substrate “adjusts” the position of their surface atoms to accommodate the graphene layer.
What you see it is not what it is! Chemical and morphological changes in the tip are frequent during an experimental STM session. We have shown the effect of different tip apexes on the appearance of atomic features of STM images by relating experimental STM images with DFT calculations. The work, which focuses on the particular case of the TiO2(110)-(1×1) surface, also identifies typical point-defects of this surface, as oxygen vacancies and hydroxyl groups.
TiO2(110)-(1×1) surface seen with a “contaminated” tip
The left panel shows an experimental STM image of the TiO2(110)-(1×1) surface. As we show by DFT calculations, in this case the W tip is terminated in a single O atom adsorbed replacing the W-apex. The right panel shows a) the STM experimental image of the same surface. A double tip formed by two O atoms adsorbed at the apex is the responsible of the image, as inferred from the theoretical calculations (image b). The presence of defects has also been simulated theoretically (images c and d).
These results have been published on “Nanotechnology”.
Molecular networks provide new surface functionality and could enable the formation of more complex structures
Nanoporous molecular systems have become an interesting field. They are well reported as templates for positioning nano-objects and for having remarkable applications in catalysis. Now metal-organic monolayers can be grown in a controlled way using PTCDA molecules and iron, which form stable coordination-based structures over extended areas.
Further information can be found in the journal Nanotechnology.
or an extended summary here
Twenty-five years ago today, on September 4, 1985, the buckyball was discovered at Rice University, and Google is commemorating that scientific discovery with an interactive doodle logo on its homepage
El sábado 4 de Septiembre, Google ha colocado en su página de inicio un nuevo logotipo -mejor conocido como “doodle”-, el cual es una representación animada de la buckyball, fullereno o buckminsterfullereno, el cual hoy se encuentra celebrando el 25º aniversario del su descubrimiento.
Nanociencia y su impacto social
DEL 19 AL 23 DE JULIO
Se celebró el curso Nanociencia y su impacto social. Participaron los siguientes ponentes:
Nazario Martín León; Mª Ángeles Herranz Astudillo;Eugenio Coronado Miralles; Jean M. Lehn; José López Carrascosa; José Ángel Martín Gago; José Manuel Pingarrón Carrazón; Fernando Briones; José Manuel Pingarrrón Carrazón; Nazario Martín León; Mª Eugenia Anta; Eiichi Nakamura; Nicolás Agrait de la Puente y Rodolfo Miranda Soriano
Como ya viene siendo habitual, cada año, antes del verano, nos reunimos los integrantes del grupo junto con nuestros colegas del CAB y antiguos miembros en el campo para hacer una barbacoa a la hora de comer y luego, por la tarde, una fiesta en la que están invitados todos los amigos y colegas. ¡¡ Hay cerveza y sangría para todos!!. Este es el programa previsto.
Este año será el día 11 de JUNIO-VIERNES.
Estas fotos corresponden a momentos estelares del año pasado
Interplay between fast diffusion and molecular interaction in the formation of self-assembled nano-structures of S-Cysteine on Au(111)marzo 23rd, 2010 | Posted by in News - (Comments Off on Interplay between fast diffusion and molecular interaction in the formation of self-assembled nano-structures of S-Cysteine on Au(111))
Fast diffusing cysteine molecules on the Au surface can be regarded as a 2D molecular gas. Molecular “evaporation” and “condensation” from the gas on the surface morphological features takes place continuously. This process leads progressively to the formation of a number of stable arrangements, not previously reported, like single-molecular rows, trimmers and 2D islands. The long-range order process of the single amino-acid on gold surface is driven by the formation of stable electrostatic interactions between adjacent molecules.
This work is the result of a collaboration between the Centro de Astrobiología and ESiSNA group. These results have been published in Langmuir.
Un equipo de investigadores del Centro de Astrobiología (INTA-CSIC) ha comprobado que a partir de la sal Azul de Prusia se pueden obtener cianuro de hidrógeno, urea y otras sustancias consideradas esenciales en la formación de las primeras moléculas biológicas. Para realizar el estudio, publicado en la revista Chemistry & Biodiversity, los científicos han recreado las condiciones químicas de la Tierra primitiva.
A single molecular magnet (SMM) is a large molecule exhibiting superparamagnetic properties, and therefore it behaves like a magnet. One of the challenges attracting more attention over the last few years has been the development of new techniques that allow their nanostructuration and addressing on surfaces, to promote their potential use for high-density information storage devices and quantum computing applications.
In a collaboration with the ICMAB and CIN2 research institutes we have been able to shown that these
molecules self-assemble on a Au surface from liquid environment forming single molecular wires. These results have been published in the journal: Langmuir.
For more details about the relevance of the work: click here
Most of the people of the ESISNA group have attended to the international conference: “Atomic controlled surfaces and interfaces- ACSIN” held in Granada (September-2009).
The conference was mainly devoted to discuss about epitaxial graphene layers and organic molecules on surfaces.After the long scientific sessions we found also time for visiting the “Alhambra by night”, together with some friends.
Here you can see a photo gallery…
Cada año, antes del verano, nos reunimos los integrantes del grupo junto con nuestros colegas del CAB en el campo para hacer una barbacoa a la hora de comer y luego, por la tarde, una fiesta en la que están invitados todos los amigos y colegas. ¡¡ Hay cerveza y sangría para todos!!. Este es el programa previsto.
Este año será el día 10 de Julio.
Surface Science studies use to prepare flat and clean surfaces by combining cycles of sputtering and annealing under Ultra-High Vacuum conditions. This procedure leads to large and ordered atomic terraces, as the shown in the image.
However, there are other simple methods to have single-atom separated terraces. These could be an starting point previous to the introduction of the sample in an UHV system. Here follows one of those.
The STM technique presents a clear drawback: the uncontrolled shape and chemical termination of the tip. This is particularly important in UHV, where atomic resolution is wanted. Tip preparation methods are therefore essential for obtaining good STM images. Here follows our optimized recipe. If you find it useful, please, let us know. Also we would appreciate if you send us yours. We will publish them here.
Here follows a list of some forthcoming conferences related to our research topics:
please, fell free to send us information about other non-listed conferences!
The group leaded by J. Tamayo y M. Calleja in “Instituto de Microelectrónica de Madrid-CSIC”, together with the ESISNA group and the “centro de Astrobiología” have developped a new nucleic acid biosensor based on the immobilization of self-assembled monolayers of DNA and PNA on micro-cantilevers.
These results have been published on “Nature Nanotechnology”
Nota de prensa publicada por el CSIC en referencia al artículo publicado en NATURE.
La FECYT (fundación Española para la ciencia y la Tecnología) ha publicado la obra titulada: “Nanociencia y nanotecnología: entre la ciencia ficción del presente y la tecnología del futuro”.
NASA and Google announced the release
of a new Mars mode in Google Earth that brings to everyone’s desktop
a high-resolution, three-dimensional view of the Red Planet.
How to make fullerenes “a la carte”: recently published in NATURE by ESISNA.
El centro de Astrobiología dispone de una nueva unidad de simulación de ambientes planetarios e interestelares dedicada a reproducir en un laboratorio las condiciones de presión, atmosfera y temperatura de diferentes planetas.