化学
基质(水族馆)
石墨烯
检出限
纳米技术
纳米结构
表面等离子共振
分子
光电子学
化学工程
纳米颗粒
材料科学
色谱法
海洋学
地质学
工程类
有机化学
作者
Xiangyu Fan,Hao Zhang,Xinru Zhao,Lv Ke,Tiying Zhu,Yaping Xia,Cheng Yang,Chengjie Bai
出处
期刊:Talanta
[Elsevier]
日期:2021-05-11
卷期号:233: 122481-122481
被引量:19
标识
DOI:10.1016/j.talanta.2021.122481
摘要
Abstract Three-dimensional (3D) SERS substrate with the denser “hotspots” is synthesized by the constriction of PDMS film decorated with sandwiched graphene@AgNPs@graphene (G@AgNPs@G) nanostructure. Graphene layers above and below the AgNPs are used to absorb molecules onto the “hotspots”, and prevent the oxidation of AgNPs in our design. PDMS films can be easily shrunk for 3D structures, causing advantages in enhancement ability and light-matter interaction. Benefiting from the above advantages, a detection limit of 10−14 M (CV) and enhancement factor (EF) of 3.9 × 109 were obtained in our experiment. Theoretical analyses (FDTD) were also used to study the enhancement mechanism. For practical purposes, in-situ detection of MG molecules on the fish surface and the label-free detection of DNA base of adenine (A) and cytosine (C) were also studied. The high enhancement factor, great sensitivity, reliability, and stability of substrate reasonably proved that it can be used as an excellent SERS substrate for biomolecular detection.
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