The institute
FEMTO's news

You are here

Polymer-based nanowires

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

Link

  • National Days on Emerging Technologies in Micro-Nanofabrication

    These scientific days, which take place from November 30 to December 2 in Besançon, France, bring together the major French players in micro-nanotechnologies, process engineering, physics and modeling of manufacturing processes.

    Read more
  • 16th International Symposium on Distributed Autonomous Robotic Systems

    Nearly a hundred scientists from all over the world will meet under the auspices of FEMTO-ST, in Montbéliard from November 28 to 30 to exchange on an interdisciplinary field in full expansion.

    Read more
  • Fei Gao wins the "Sustainable Future Visionary Award"

    Full professor at UTBM and researcher at FEMTO-ST institute, Fei Gao is today one of the world's leading specialists in fuel cells and digital twins.

    Read more
  • Gold micron award at MICRONORA trade fair 2022

    FEMTO-ST is awarded a gold micron for its three-dimensional nanorobotic structure, which is precisely and continuously actuated according to the power of light for the gripping of nano objects.

    Read more
  • FEMTO-ST at MICRONORA trade fair 2022

    From September 27th to 30th, more than 600 direct exhibitors and 15000 professional visitors are expected in Besançon on the international microtechnology exhibition. FEMTO-ST and FEMTO Engineering will be present.

    Read more
  • The fastest pick-and-place robot in the world

    A research team has developed a miniature robot capable of manipulating micrometric objects at unprecedented speeds. This work has been published in the prestigious American journal "Science Robotics"

    Read more
  • Aude Bolopion receives the 2022 “Big-in-Small award”

    This yearly award, from the microrobotics international community in the MARSS conference in Toronto, promotes “the best microrobotician” of the year at the international level.

    Read more
  • FEMTO-ST : 2 full professors appointed to the IUF in its class 2022

    Ausrine MARGUERON-BARTASYTE and Daniel HISSEL are among the 164  national laureates appointed to the Institut Universitaire de France (IUF) by the Minister of Higher Education and Research

    Read more
  • Tribute to our colleague Philippe LUTZ

    Our scientific community of Burgundy-Franche-Comté has just suddenly lost Philippe LUTZ, full professor at the University of Franche-Comté and a leading figure in microrobotics and micromechatronics research at the FEMTO-ST laboratory.

    Read more
  • How to create a chemical bond with light?

    The formation of a chemical bond between two molecules often requires an activation process. Light is a stimulus that is particularly interesting

    Read more

Pages