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Journal of Nanomaterials
Volume 2014 (2014), Article ID 538024, 7 pages
http://dx.doi.org/10.1155/2014/538024
Research Article

Highly Sensitive Surface Enhanced Raman Spectroscopy from Ag Nanoparticles Decorated Graphene Sheet

1Department of Microelectronics, School of Electronics and Information Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
2State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China

Received 13 August 2014; Revised 15 October 2014; Accepted 16 October 2014; Published 10 November 2014

Academic Editor: Weihai Ni

Copyright © 2014 Hui Song 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

Surface enhanced Raman spectroscopy (SERS) is a powerful analytical technique and has been most intensively studied. In this work, electroless deposition is proposed for Ag nanoparticles (NPs) decorated on chemical vapor deposition (CVD) growth graphene sheets (GS) to create hybrid SERS substrate. From three aspects of size distribution, morphology, and coverage, Ag NPs controllable decoration on GS and SERS enhancement factors of the hybrid SERS substrate is investigated. 200–300 times enhanced SERS intensities are detected from the Ag NPs on GS hybrid as compared to pure GS. Controllable decoration is crucial for improving SERS enhancement factors , because from quasi cubic Ag NPs on GS is 6.53 times stronger than that from spheric one; 1.6 times is detected while the Ag NPs size distribution is reduced to half, and when the coverage is doubled, is nearly doubled. This controllable Ag NPs/GS hybrid is capable of serving as a high performance SERS substrate for efficient chemical and biological sensing applications.