Pillar-cap shaped arrays of Ag/SiO2 multilayers after annealing treatment as a SERS—active substrate
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- 作者：Yaxin Wang ; Mengning Zhang ; Chao Yan ; Lei Chen ; Yang Liu ; Ji Li ; Yongjun Zhang ; yjzhang@jlnu.edu.cn" class="auth_mail" title="E-mail the corresponding author ; Jinghai Yang
- 关键词：SERS-active substrate ; Pinholes ; Ag nanoparticles ; Hot spots
- 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
- 出版年：2016
- 出版时间：5 October 2016
- 年：2016
- 卷：506
- 期：Complete
- 页码：96-103
- 全文大小：2360 K
文摘
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We have demonstrated a low-cost and easy handling method for SERS substrate of nanopillar-cap array, in which the high-density hotpots are generated by heating Ag/SiO2 multilayer.
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A corona-like structure consisting of SiO2-trapped Ag nanoparticles forms on the surface of nanopillar-cap array after annealing.
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The corona-like structure and nanoparticle sizes can be modulated by annealing.
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The annealed multilayers enhance the plasmon coupling and result high SERS intensity.
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In addition, the annealed pillar-cap array shows the excellent signal reproducibility (6.2%).
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This fabrication method could avoid the unnecessary and cumbersome stages in chemical surface modification, which made the substrate a promising candidate for the SERS detection.