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Congreso Fuerzas y Tunel 2012

Nanotecnología para explicar el origen de la vida

Ph.D. GRANT

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 (jmendez@icmm.csic.es), and/or

- Dr. Pedro de Andres (pedro.deandres@csic.es).

stating their interests and previous formation. Reference letters will be appreciated.

Deadline: February 2012

General objectives:

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.

Candidate eligibility:

Up to 3 years after the award of a PhD (or equivalent)

Financial support:

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

More information:

I.U.S.V.T.A.  web site or gago@icmm.csic.es

“Bailando con átomos”

and the videos in other formats:

videos in youtube

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.

More information about this work

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.

Schematic and simplified representation of an on-surface synthesis process. The deposited molecular precursors arrive to the surface and diffuse on it. In some cases, they could form an ordered SAM, which provides a pre-organization of the system. After a thermal treatment activated species can be formed. These species could lead either to surface organic frameworks (SOF) or being individually transformed into other different molecular species (nano-object), after for example, a surface assisted cyclodehydrogenation (SACDH) reaction.

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 30^th. 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 frank_shepherd@avs.org

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

]]> http://www.icmm.csic.es/grupos/?feed=rss2&p=1315 http://www.icmm.csic.es/grupos/?p=1282 http://www.icmm.csic.es/grupos/?p=1282#comments Mon, 03 Jan 2011 15:35:27 +0000 admin http://www.icmm.csic.es/grupos/?p=1282 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.