Laboratoire Charles Coulomb UMR 5221 CNRS/UM2 (L2C)


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Coupled enhancements of the Raman signal of graphene deposited on multipayer substrates

par Christelle EVE - publié le

The SMC and NMAT groups in L2C presently work on the design of ultrasensitive and specific biosensors based on the enhanced Raman signal of analytes immobilized on a functionalized graphene layer deposited on a multi-layered nanostructured device. The bottom part of the devices is a stack of metal/dielectric thin films (TF) designed to optimize Interference Enhancement Raman Spectroscopy (IERS) signal by tuning their thickness and optical properties. The top part of the device is an array of metal nanostructures (MN) designed to tune and to optimize their Localized Surface Plasmon Resonance (LSPR) and their related Surface Enhanced Raman Spectroscopy (SERS) properties. The device is protected by a graphene flake which can be specifically functionalized for label-free detection of bio-analytes with low limits of detection via their enhanced Raman signal taking advantage of both IERS and SERS.
The internship will be dedicated to i) the preparation of TF, primarily polymethyl methacrylate (PMMA)/Al or cuprous oxide (Cu2O)/Cu, by spin-coating for PMMA, thermal evaporation for Al and Cu, and thermal oxidation for Cu2O, and ii) the optimization of SLG transfer on these different substrates by chemical and electrochemical ways. Providing these two first steps will be achievedTF will be decorated with MN, primarily gold nanoparticles and dimers, by spin-coating or dip-coating and the Raman spectra and related enhancements of these multilayered nanostructured device will be studied, for various laser exciting energies close or far to the LSPR and IERS maxima.

Equipes Transport quantique & nouveaux systèmes 2D et Nanomatériaux du Laboratoire Charles Coulomb

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