[OPTICAL REVIEW Vol. 20, No. 5 (2013) 361-366]
© 2013 The Japan Society of Applied Physics

Self-Assembled Ag Nanoparticles for Surface Enhanced Raman Scattering

Shuangmei ZHU1,2, Chunzhen FAN1,3, Junqiao WANG1, Jinna HE1, and Erjun LIANG1*

1School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China
2Department of Mathematical and Physical Sciences, Henan Institute of Engineering, Zhengzhou 451191, China
3State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China

(Received February 27, 2013; Accepted June 26, 2013)

Uniform and reproducible substrates for surface enhanced Raman scattering (SERS) are fabricated by self-assembly of Ag nanoparticles (NPs) on 3-aminopropyltrimethoxysilane (APTES) modified glass. Experimental results indicate that the Ag NPs with a narrow size distribution were assembled as a sub-monolayer which exhibits an excellent SERS-activity. The SERS enhancement factor is estimated to be 7.5× 106 and the detection limit for crystal violet (CV) solution is about ∼10-11 M. The uniformity and reproducibility of the SERS signals are tested by point-to-point and batch-to-batch measurements. It is confirmed that the self-assembled Ag NPs substrates has a high SERS reproducibility and a low standard deviation with respect to the Ag NPs on non-functionalized glass substrates. The self-assembled Ag NPs substrates can be widely used for the application of chemical and biochemical sensing.

Key words: Ag nanoparticles, self-assembled substrate, surface enhanced Raman scattering

*E-mail address: ejliang@zzu.edu.cn