Fabricating Surface Enhanced Raman Scattering (SERS)-Active Substrates by Assembling Colloidal Au Nanoparticles with Self-Assembled Monolayers

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Abstract
A simple method for fabricating SERS-active substrates with colloidal gold nanoparticles is reported. Spontaneous adsorption of HSCH2CH2NH2 on Au-evaporated glass led to a self-assembled monolayer with an amino-terminated surface, on which mono-dispersed colloidal Au nanoparticles were assembled into a two-dimensional array. Thus-prepared substrates were shown to be SERS-active, evidenced by the enhanced Raman scattering from BPE and an azobenzene derivative. The SERS enhancement factor was calculated to be 3×103. Raman mapping and AFM imaging disclosed the good uniformity of the particle distribution on the surface on micrometer scale.