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Proceedings Paper

Preparation and analysis of the Au-SiO2 multi-layer nanospheres as high SERS resolution substrate
Author(s): Weihua Tian; Kaiyu Wu; Xiulan Cheng; Xiaodong Chen; Rui Chen; Ying Wang
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Paper Abstract

Metallic nanocomposite material is widely used in Surface Plasmon Rsesonance (SPR) due to its high stability and special optical features which enhance the Surface Enhanced Ramon Scattering (SERS) effect. A novel multi-layered Au-dielectric core-shell structural SERS substrate is proposed. Finite Elment Analysis (FEA) simulation shows multi-layer shell-core nanosphere (SiO2@Au, SiO2@Au@SiO2...) can improve Local Field Enhancement (LFE), comparing to Au single-layer nanosphere. That is because multi-layer nanoshpere exists intra-layer coupling besides cavity coupling. Moreover, red-shift can be observed via tuning the thickness of multi-layer nanospheres, which is greatly beneficial to biological detection in near infrared region (NIR). Lastly, these multi-layer nanospheres are synthesised by liquid phase reduction. And high absorbance and red-shift effect are verified with UV-vis absorption spectrum.

Paper Details

Date Published: 29 November 2011
PDF: 8 pages
Proc. SPIE 8311, Optical Sensors and Biophotonics III, 83110K (29 November 2011); doi: 10.1117/12.904205
Show Author Affiliations
Weihua Tian, Shanghai Jiao Tong Univ. (China)
Kaiyu Wu, Shanghai Jiao Tong Univ. (China)
Xiulan Cheng, Shanghai Jiao Tong Univ. (China)
Xiaodong Chen, Shanghai Jiao Tong Univ. (China)
Rui Chen, Shanghai Jiao Tong Univ. (China)
Ying Wang, Shanghai Jiao Tong Univ. (China)


Published in SPIE Proceedings Vol. 8311:
Optical Sensors and Biophotonics III
Jürgen Popp, Editor(s)

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