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Molecules, salt and light : an easy recipe to provide giant nanowires !
On-surface polymerization of organic precursors provides new possibilities to form highly-stable and atomically-defined nanostructures with desired properties. As emphasized by the Nobel Prize in Physics in 2016, awarded for early work in understanding topological phase transitions and topological phases of matter, the formation of artificial matter exhibiting properties controlled by their symmetry is very promising in nanoelectronics. This issue has been addressed by many research groups who performed on-surface reactions under ultra-high vacuum (UHV) conditions and on atomically clean single-crystal metal substrates. In this solvent-free environment, classical chemical reactions such as Ullmann type coupling, Glaser coupling, and many more have successfully been used to create well-defined and covalently bound organic 1D and 2D structures with dimensions of about 100 nm. However, for the basic building blocks of molecular circuitry to interconnect active devices there is a need to fabricate isolated nanowires with a length larger than 1 μm.
Other than length, the main limitations of structures fabricated to date for use in future nanoscale electronic and optical devices are (i) the use of metal substrates (for instance, leading to non-radiative quenching), (ii) the high number of defects in the formed covalent structures, and (iii) the side-products of some reactions that might remain on the substrate surface. This is why in our work, published in Nature Chemistry, we overcome these identified obstacles by using a side product-free 1D polymerization on an alkali-halide surface. This new concept is driven by light-induced radical polymerization, a classic chemical reaction pathway, but one which has never been transferred onto the surface of bulk insulators so far.
Noncontact atomic force microscopy was used to evaluate the geometrical structure of the fibres formed on the KCl substrate and to test both their mechanical and thermal stability. A deeper insight into the reaction mechanism and the energy barriers involved is obtained by comparing the experimental observations with calculations, which revealed the strong localization of the active biradicals at the fibre ends.
We hope that with our work we will ‘initiate’ a completely new way to synthesize organic compounds on surfaces, especially on insulating substrates.
Contact : Frédéric Chérioux
Robotic assembly of the smallest house in the world
the handling and assembly capabilities of nanocomponents of the "μRobotex" platform make the buzz on the net and in the international press through the origami manufacturing of a micro-house at the end of an optical fiber whose dimensions are less than the diameter of a hair.Read more
International Day of Light 2018
Following the success of the International Year of Light, which highlighted the importance of light-based science and technology and generated more than 13,000 activities in 147 countries, UNESCO proclaimed May 16 as the International Day of Light.Read more
Enrico Rubiola honored at IFCS 2018
Enrico Rubiola will receive the W. G. Cady Award at the IFCS 2018 on May 24th.Read more
L'institut FEMTO-ST partenaire d'un programme européen Marie-Curie H2020 Innovative Training Networ
The department of Optics of the FEMTO-ST research institute in Besançon Read more
in France currently has a vacancy for 2 3-years Ph.D positions working in
the development of mid-infrared and ultraviolet supercontinuum fiber sources within the
FACS 2016 - The 13th International Conference on Formal Aspects of Component Software
The DISC department, organizer of the 13th International Conference on FACS.
Special issue of Comptes Rendus Physique on phononic crystals
The May 2016 issue of Comptes Rendus Physique (an international peer-reviewed journal of the French Academy of Sciences), is devoted to phononic crystals. This special issue was coordinated by Vincent Laude.
Paper prize at the international conference VPPC 2014
At the International IEEE "Vehicle Power and Propulsion Conference" conference held in Coimbra, Portugal from 27 to 30 October 2014, “Hybrid & Fuel Cell Systems” Research Team of Femto-ST Institute won the Paper Prize for the paper titled “Energy management of an hybrid electrical vehicule in degraded operation”
A book about flexible robotics co-written by Nicolas Chaillet
The objective of the book "Flexible Robotics: Applications to Multiscale Manipulations" is to provide those interested in the field of flexible robotics with an overview of several scientific and technological advances in the practical field of robotic manipulation.
Nonlinear Optics and Supercontinuum Symposium
A one day “Nonlinear Optics and Supercontinuum Symposium” will be held on Friday 20 September in the Amphi FEMTO in honour of Professor Chinlon Lin who will be here in Besançon during this time.