Seminar – « Microwave absorption and radiation from large-area multilayer CVD graphene »

15 Juillet 2014, 11h, amphithéâtre IEMN

Professor Yang Hao, Queen Mary University

Here we experimentally study the microwave absorption and near-field radiation behaviour of monolayer and few-layer, large-area CVD graphene in the C and X bands. Artificial stacking of CVD graphene reduces the sheet resistance, as verified by non-contact microwave cavity measurements and four-probe DC resistivity. The multilayer stacked graphene exhibits increased absorption determined by the total sheet resistance. The underlying mechanism could enable us to apply nanoscale graphene sheets as optically transparent radar absorbers. Near-field radiation measurements show that our present few-layer graphene patches with sheet resistance more than 600 Ω/sq exhibit no distinctive microwave resonance and radiate less electromagnetic power with increasing layers; however, our theoretical prediction suggests that for samples to be practical as microwave antennas, doped multilayer graphene with sheet resistance less than 10 Ω/sq is required.

Seminar – « High-field NMR spectroscopy: A key to advance the frontiers of structural biology and material sciences »

SEMINAIRE ExCELSiOR : 12/06/2014 à 10h00 – Amphi. IEMN
sur le thème du projet Lillois ‘RMN1200’

Guy Lippens, Prof. Lille1, Labo de GLYCOBIOLOGIE
Olivier Lafon, Prof. Lille1, UCCS


« High-field NMR spectroscopy: A key to advance the frontiers of structural biology and material sciences »
« Nuclear Magnetic Resonance spectroscopy has become an indispensable tool to characterize the atom-level structure and dynamics in a wide range of systems, ranging from biomolecules involved in Alzheimer diseases to energy materials. The increase of magnetic field has allowed us to apply NMR to more and more complex systems. In this context, the University of Lille 1 has recently been selected for the installation of the world’s most powerful NMR instrument with a magnetic field of 28 T, i.e. a 1H Larmor frequency of 1200 MHz. This didactic seminar will present the basic principles of NMR spectroscopy and instrumentation. We will also highlight recent achievements of high-field NMR. The content of the seminar is intended for a non-specialist audience. »