材料科学
制作
纳米尺度
纳米技术
拉曼散射
原子力显微镜
涂层
纳米线
再现性
散射
拉曼光谱
光学
化学
物理
病理
医学
色谱法
替代医学
作者
Han Wen,Jiangtao Li,Qiang Zhang,Tomoko Inose,Wannes Peeters,Beatrice Fortuni,Hitoshi Asakawa,Akito Masuhara,Kenji Hirai,Shuichi Toyouchi,Yoshihiro Fujita,Hiroshi Uji‐i
出处
期刊:Nano Letters
[American Chemical Society]
日期:2022-12-09
卷期号:23 (4): 1615-1621
被引量:1
标识
DOI:10.1021/acs.nanolett.2c03985
摘要
Tip-enhanced Raman scattering (TERS) microscopy is an advanced technique for investigation at the nanoscale that provides topographic and chemical information simultaneously. The TERS probe plays a crucial role in the microscopic performance. In the recent past, the development of silver nanowire (AgNW) based TERS probes solved the main tip fabrication issues, such as low mechanical strength and reproducibility. However, this fabrication method still suffers from low control of the protruded length of the AgNW. In this work, a simple water-air interface electrocutting method is proposed to achieve wide controllability of the length. This water cutting method was combined with a succedent Au coating on the AgNW surface, and the probe achieved an up to 100× higher enhancement factor (EF) and a 2× smaller spatial resolution compared to pristine AgNW. Thanks to this excellent EF, the water-cut Au-coated AgNW probes were found to possess high TERS activity even in the nongap mode, enabling broad applications.
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