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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)

F. TODERAS1,* , S. BOCA1, M. BAIA1, L. BAIA1, D. MANIU1, S. ASTILEAN1, S. SIMON1

Affiliation

  1. Nanobiophotonics Laboratory, Institute for Interdisciplinary Experimental Research and Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania

Abstract

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..

Keywords

Gold nanoparticles, Plasmons, P-aminothiophenol, SERS, SEIRA.

Submitted at: Nov. 15, 2006
Accepted at: March 15, 2007

Citation

F. TODERAS, S. BOCA, M. BAIA, L. BAIA, D. MANIU, S. ASTILEAN, S. SIMON, 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), Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 3, pp. 625-628 (2007)