Silver        nanosheet-coated inverse opal film as a highly active and uniform SERS substrate

Lifang He; Jianan Huang; Tingting Xu; Limiao Chen; Kui Zhang; Suting Han; Yao He; Shuit Tong Lee

doi:10.1039/C1JM14144A

Silver nanosheet-coated inverse opal film as a highly active and uniform SERS substrate†

Lifang He,^a Jianan Huang,^a Tingting Xu,^a Limiao Chen,^a Kui Zhang,^c Suting Han,^a Yao He*^b and Shuit Tong Lee*^a

* Corresponding authors

^a Center of Super-Diamond Advanced Films (COSDAF) and Department of Physics & Materials Science, City University of Hong Kong, Hong Kong, SAR, China
E-mail: apannale@cityu.edu.hk.

^b Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, China
E-mail: yaohe@suda.edu.cn

^c Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui, China

Abstract

The availability of well-controlled and reproducible substrates is critically important for surface-enhanced Raman spectroscopy (SERS)-based applications, but it remains a challenge at present. Herein, we report a facile strategy to prepare a new kind of SERS-active substrate, i.e., a two dimensional (2D) macroporous Ag film composed of a silver nanosheet (AgNS)-coated inverse opal film. The prepared substrate features good SERS reproducibility with a high enhancement factor (6 × 10⁷), enabling the ultra-sensitive detection of 10 fM rhodamine 6G (R6G). Moreover, the resultant substrate can be applied in the label-free detection of DNA with a sensitivity limit as low as 5 nM. Consequently, as a high-performance SERS-active substrate, the 2D AgNS-coated inverse opal film is promising for a myriad of chemical and biochemical sensing applications.

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Article information

DOI: https://doi.org/10.1039/C1JM14144A
Article type: Paper
Submitted: 24 Aug 2011
Accepted: 31 Oct 2011
First published: 18 Nov 2011

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J. Mater. Chem., 2012,22, 1370-1374

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Silver nanosheet-coated inverse opal film as a highly active and uniform SERS substrate

L. He, J. Huang, T. Xu, L. Chen, K. Zhang, S. Han, Y. He and S. T. Lee, J. Mater. Chem., 2012, 22, 1370 DOI: 10.1039/C1JM14144A

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