Self-assembled multilayers of gold nanoparticles as versatile platforms for molecular sensing by Fourier transform-surface enhanced scattering (FT-SERS) and surface enhanced infrared absorption (SEIRA)

摘要

A wet-chemistry strategy for fabricating multilayers of gold nanoparticles on solid substrates is proposed. The strategy is based on immobilization of discrete gold colloid arrays on aminosilane-functionalized substrate with subsequent immersion of the substrate in gold colloidal and p-aminothiophenol solutions. The formation of multilayers structures was confirmed by AFM images and uv-vis absorption spectroscopy. Both FT-SERS and SEIRA (in ATR mode) spectra of p-aminothiophenol absorbed onto as prepared gold films were successfully recorded. The result offers a valuable approach for chemical trace analysis and bio-sensing.