Table of Contents
Journal of Nanoparticles
Volume 2014, Article ID 602385, 9 pages
http://dx.doi.org/10.1155/2014/602385
Research Article

A Simple Approach to Engineer SERS Substrates and Plasmonic Thin Film

1Department of Chemistry, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh
2Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada

Received 20 May 2014; Accepted 15 August 2014; Published 25 August 2014

Academic Editor: Raphael Schneider

Copyright © 2014 Nur Uddin Ahamad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Solid supported 2D assembly of silver nanocubes was fabricated by Langmuir-Blodgett technique and employed to investigate its surface enhanced Raman scattering (SERS) and surface enhance fluorescence (SEF) activities by detecting Rh6G in solution of varied concentrations, that is, 10−12 M, 10−9 M, 10−6 M, and 10−3 M. SERS was detected from a nanomolar concentration of Rh6G whereas SEF was detected from a picomolar concentration. Further, the substrate was subjected to thermal annealing to fabricate plasmonic thin film. The formation of thin film was followed by monitoring its surface plasmon resonance spectra and atomic force microscopic images. It was observed that the characteristic spectral peaks of silver nanocubes merged into a broad spectral band as the annealing time was increased and the intensity of the band decreased with the formation of thin film. The obtained result implies that thermal annealing could be a simple approach to create nanoscale gaps in SERS substrate and to engineer continuous thin film from the assembly of discrete nanoparticles.