Silver films coated inverted cone-shaped nanopore array anodic aluminum oxide membranes for SERS analysis of trace molecular orientation

被引：20
作者：
He, Shixuan [1 ,2 ]
Xie, Wanyi [1 ]
Fang, Shaoxi [1 ]
Huang, Xin [2 ]
Zhou, Darning [1 ]
Zhang, Zhiyou [2 ]
Du, Jinglei [2 ]
Du, Chunlei [1 ,2 ]
Wang, Deqiang [1 ]
机构：
[1] Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing Key Lab Multiscale Mfg Technol, 266 Fangzheng Ave, Chongqing 400714, Peoples R China
[2] Sichuan Univ, Coll Phys Sci & Technol, Chengdu 610065, Sichuan, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2019年 / 488卷
基金：
中国国家自然科学基金;
关键词：
SERS; Molecular orientations; Inverted cone-shaped nanopore plasmonic structure; Anodic aluminum oxide; RHODAMINE; 6G; FABRICATION; SUBSTRATE; GOLD; NANOSTRUCTURES;
D O I：
10.1016/j.apsusc.2019.05.298
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Reproducible surface enhanced Raman scattering (SERS) enhanced performance, affected by molecular orientations in plasmonic nanostructures, attracts more attention than SERS detection sensitivity for satisfying requirements of practical applications. In this work, by coating silver films on the inverted cone-shaped nanopore array anodic aluminum oxide membranes, we provide a way to study the effect of molecular orientations on SERS enhancement with mapping technology. SERS enhanced performance of the fabricated substrates is assessed with trace Rhodamine 6G detection, enhancement factor calculation and 3D finite-difference time-domain simulation respectively. It is found that inverted cone-shaped nanopore and silver films both contribute to the highly SERS enhancement. And special inverted cone-shaped nanopore plasmonic structures limit molecular vibrations so as to affect Raman scattering enhancement. These findings can help us to understand the electromagnetic mechanism of molecular orientations on SERS enhancement, so as to design highly reproducible SERS substrates for various applications.
引用
收藏
页码：707 / 713
页数：7
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