Prof. Jean-Christophe VALMALETTE
Institut Matériaux Microélectronique et Nanosciences de Provence (IM2NP)
CNRS UMR 6242
Université du Sud Toulon et du Var
F-83957 La Garde Cedex
valmalette AT univ-tlv.fr +33.4220.127.116.11
Valmalette has been Professor in Physics, Université du Sud
a first academic training in physical chemistry, he passed his Master's Degree
in Materials Science in 1991 at
1995 to 1997, he occupied a post-doctoral position at the Swiss Federal
Institute of Technology of
1997, Prof. J. C. Valmalette was appointed Assistant Professor at
In 2002, Prof. J. C. Valmalette published new initial results on the reactive nanostructuration of ZrxAuy and CexAuy intermetallic compounds leading to the formation of Au-ZrO2 and Au-CeO2 nanoparticles at room temperature. He used synchrotron radiation, neutron diffraction and Raman spectroscopy to explain this unexpected mechanism leading for the first time to the formation of 3 nm monoclinic ZrO2 crystals. He suggested at thermodynamical model for interpreting the size-effect on the structural transition (m)«(t). New catalytic properties are now obtained from these nanostructured materials.
Since 2003, Prof. J. C. Valmalette has been working on the mechanism of self-assembled nano-crystals of CuC2O4, leading to 2D and 3D mesocrystals. The architecture of these assemblies strongly depends on crystallographic features and the use of polymeric additives during synthesis. He was involved in several projects including STREP (EU Programs) in relation with the downscaling in microelectronics.
Starting in 2005, he coordinated the Nanoscale Raman Project for the IM2NP Institute in collaboration with microelectronics companies. His group is now using a Scanning Probe Microscope associated with a Raman spectrometer in a lateral configuration. This project is focused on the enhancement effects obtained by SERS substrates (applied to Self-Assembled Monolayers) and tailored probes (optical nano-antenna) obtained by bottom-up approaches. The first papers were published on the depolarizing effects induced by the AFM tips in TERS (Tip Enhanced Raman Spectroscopy) on Si(100) crystals.
He started in 2010 a collaboration with Alain Robichon (Agrobiotech - Sophia-Antipolis). He investigated a photo-induced charge transfer mechanism occurring in biological interface (published in Nature Scientific Reports) and suggested for the first time a photosynthesis-like process in insect (Nature News)
Prof. J. C. Valmalette is an expert on Raman spectroscopy, phase transitions, optical properties of materials and more generally on the relationships between structures and optical properties in solids.
Prof. J.C. Valmalette has taken responsibility for the Master of Materials Science from 2004 to 2008. He is also member of the Scientific Committee of University of Toulon (France) and involved as expert in international programs.