9 research outputs found
Determination of the electron temperature by optical emission spectroscopy in a 13.56 MHz dusty methane plasma: Influence of the power
International audienc
Influence of the particle formation and behavior on the electrical parameters in the low pressure radio frequency discharge.
International audienc
Analyse par Spectroscopie infrarouge des particules carbonées contenues dans une décharge R.F. basse pression de méthane azote
National audienc
Particles generated in a low pressure radio frequency nitrogen-rich methane discharge
International audienc
Synthesis and SERS application of SiO2@Au nanoparticles
International audienceIn this letter, we report a chemical route for synthesizing SiO2@Au core-shell nanoparticles. The process includes four steps: i) preparation of the silica cores, ii) grafting gold nanoparticles over SiO2 cores, iii) priming of the silica-coated gold nanoparticles with 2 and 10 nm gold colloids and finally iv) formation of complete shell. The optical extinction spectra were experimentally measured and compared to numerical calculations in order to confirm the dimensions deduced from SEM images. Finally, the potential of such core-shell nanoparticles for biosensing was probed by means of Surface Enhanced Raman Scattering measurements and revealed higher sensitivities with much lower gold quantity of such core-shell nanoparticles compared to Au nanoparticles exhibiting similar diameters