Density effect of gold nanodisks on the SERS intensity for a highly sensitive detection of chemical molecules

Abstract : Surface-enhanced Raman scattering (SERS) is a sensitive and widely used as spectroscopic technique for chemical and biological structure analysis. One of the keys to increase the sensitivity of SERS sensors is to use nanoparticles/nanostructures. Here, we report on the density effect of gold nanodisks on SERS intensity for a highly sensitive detection of chemical molecules. Various densities of gold nanodisks with a height of 30 nm on gold/glass substrate were fabricated by electron beam lithography in order to have a good uniformity and reproducibility. The evolution of the enhancement factor (EF) with nanodisk density was quantified and compared to numerical calculations. An EF as high as 2:6 Â 10 7 was measured for the nanodisk with a diameter of 110 nm and a periodicity of 150 nm which corresponds to the highest density (42.2 %).
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Jean-François Bryche, Raymond Gillibert, Grégory Barbillon, Mitradeep Sarkar, Anne-Lise Coutrot, et al.. Density effect of gold nanodisks on the SERS intensity for a highly sensitive detection of chemical molecules. Journal of Materials Science, Springer Verlag, 2015, 50 (20), pp.6601-6607. ⟨10.1007/s10853-015-9203-x⟩. ⟨hal-01230274⟩

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