Challenges in suspending CVD graphene: More than capillary effects

session 3: 2D Emerging MaterialsInternational audienceIt is known that the fabrication of graphene NEMS raises several technological issues. Beyond capillarity effects, the quality of the interface between graphene and resist is the most critical challenge. In this paper we propose a high yield route for the fabrication of suspended graphene structures, using technological steps compatible with large-scale fabrication. AFM and Raman characterization results are used to probe suspension, added defects and strain evolution during the process

A study of the residual strain in suspended CVD graphene devices made by a robust fabrication route

session: 2D MaterialsInternational audienc

The trans-envelope architecture and function of the type 2 secretion system: new insights raising new questions.

Nanomachines belonging to the type IV filament (Tff) superfamily serve a variety of cellular functions in prokaryotes, including motility, adhesion, electrical conductance, competence and secretion. The type 2 secretion system (T2SS) Tff member assembles a short filament called pseudopilus that promotes the secretion of folded proteins from the periplasm across the outer membrane of Gram-negative bacteria. A combination of structural, biochemical, imaging, computational and in vivo approaches had led to a working model for the assembled nanomachine. High-resolution cryo-electron microscopy and tomography provided the first view of several homologous Tff nanomachines in the cell envelope and revealed the structure of the outer membrane secretin channel, challenging current models of the overall stoichiometry of the T2SS. In addition, recent insights into exoprotein substrate features and interactions with the T2SS have led to new questions about the dynamics of the system and the role of the plasma membrane in substrate presentation. This micro-review will highlight recent advances in the field of type 2 secretion and discuss approaches that can be used to reach a mechanistic understanding of exoprotein recognition, integration into the machine and secretion

Robust fabrication of suspended structures from CVD graphene (Oral Plenary)

Oral plenaryInternational audienc

Probing thermalization and dynamics of high-energy quasiparticles in a superconducting nanowire by scanning critical current microscopy

Besides its fundamental interest, understanding the dynamics of pair breaking in superconducting nanostructures is a central issue to optimize the performances of superconducting devices such as qubits or photon detectors. However, despite substantial research efforts, these dynamics are still not well understood as this requires experiments in which quasiparticles are injected in a controlled fashion. Until now, such experiments have employed solid-state tunnel junctions with a fixed tunnel barrier. Here we use instead a cryogenic scanning tunnelling microscope to tune independently the energy and the rate of quasiparticle injection through, respectively, the bias voltage and the tunnelling current. For high energy quasiparticles, we observe the reduction of the critical current of a nanowire and show it is mainly controlled by the injected power and, marginally, by the injection rate. Our results prove a thermal mechanism for the reduction of the critical current and unveil the rapid dynamics of the generated hot spot

Robust fabrication of suspended graphene structures

posterNational audienc

Selective area growth of ZnO nanowires with controllable polarity using chemical bath deposition

National audienc

Study of annealing temperature influence on the performance of top gated graphene/SiC transistors

International audienc