Polarized SERS substrates with directionality, repeatability and orderability: an anisotropic Ag nanocavity array

Xiuxia Tang; Xiaoyu Zhao; Jiahong Wen; Jia Liu; Fengyi Zhang; Xiaojie Guo; Kun Zhang; Jian Zhang; Aofang Wang; Renxian Gao; Yaxin Wang; Yongjun Zhang

doi:10.1039/D2TC02872G

Polarized SERS substrates with directionality, repeatability and orderability: an anisotropic Ag nanocavity array†

Xiuxia Tang,

‡^a Xiaoyu Zhao,‡*^a Jiahong Wen,^bc Jia Liu,^a Fengyi Zhang,^a Xiaojie Guo,^a Kun Zhang,^a Jian Zhang,

^a Aofang Wang,^d Renxian Gao,^e Yaxin Wang^a and Yongjun Zhang*^a

Author affiliations

* Corresponding authors

^a College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
E-mail: zhaoxy@hdu.edu.cn, yjzhang@hdu.edu.cn

^b The College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, P. R. China

^c Zhejiang Laboratory, Hangzhou 311100, P. R. China

^d Medical School of Hangzhou Dianzi University, Hangzhou 310018, P. R. China

^e College of Physical Science and Technology, Xiamen University, Xiamen 361005, P. R. China

Abstract

This paper reports the design and fabrication of an anisotropic Ag nanocavity array, which mainly uses magnetron sputtering and ion beam etching techniques to get the ordered Ag nanocavity array on the polystyrene templates. The nanocavity array can be used as an active substrate for polarized Raman scattering to eliminate polarization-independent background clutters. By controlling the etching angle of the ion beam and the film thickness of the sample, the size of the Ag nanocavity and the position of hot spots can be tuned. The polarized extinction spectra and the polarization Raman test further show the anisotropy of the nanocavity array, which leads to angle-dependent SERS observations. The three-dimensional simulation results of the polarized electric field are consistent with the polarized Raman spectroscopy results, and the fundamental reason for the response of an anisotropic nanostructure to polarized light is found. The angle-dependent SERS excited by polarized light is used to eliminate the background signals, which finally leads to improved SERS signals.

Journal of Materials Chemistry C

Polarized SERS substrates with directionality, repeatability and orderability: an anisotropic Ag nanocavity array†

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Polarized SERS substrates with directionality, repeatability and orderability: an anisotropic Ag nanocavity array

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