科研之友
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摘要
Gold nanoparticles were synthesized by using sodium citrate and they were deposited on silicon wafer by immersion and by solvent evaporation methods. Silicon wafers was functionalized for the first method and a template of colloidal silica was used in the second one. Scanning electron microscopy shows a homogeneous distribution of nanoparticles on the surface for the immersion method and a self-assembly of gold nanoparticles forming clusters with different sizes in the solvent evaporation one. Rhodamine 6G at concentrations as lower as 10(-7) M was used to characterize the Surface Enhanced Raman scattering on surfaces prepared by both methods. The largest enhancement of Raman signal was observed for those substrates prepared by solvent evaporation where clusters were formed. Such enhancement is attributed to the intense electromagnetic field produced by plasmon resonance of gold nanoparticles deposited on a surface.
- 出版日期2011-4
