Controllable plasmon-induced catalytic reaction by surface-enhanced and tip-enhanced Raman spectroscopy
Controllable plasmon-induced catalytic reaction by surface-enhanced and tip-enhanced Raman spectroscopy
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表面增强和尖端增强拉曼光谱可控等离子体诱导催化反应
DOI：
10.1016/j.saa.2019.04.086
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Jiang Yijian
中科院分区：
文献类型：
--
作者：
Liu Yanqi;Zhao Yan;Zhang Lisheng;Yan Yinzhou;Jiang Yijian
可控催化反应在多相催化反应中占有重要地位。表面增强拉曼散射（Sers）和针尖增强拉曼光谱（TERS）由于其高度的局域灵敏度和纳米级的空间分辨率而被认为是研究催化反应的最有前途的技术。本文采用Ag/Au复合膜作为催化剂，对4-硝基苯乙胺（4 NBT）合成对，对′-二巯基偶氮苯（DMAB）的催化反应进行了原位监测。在银针尖-Au基底几何结构中，通过控制针尖与样品表面之间的高度，利用TERS可以在纳米尺度上控制吸附在Au膜上的4 NBT的催化反应。根据时域有限差分（FDTD）模拟，由局域表面等离子体激元诱导的“热电子”足以促进催化反应。这些发现为在纳米尺度上对分子进行可控绘图提供了一种新的途径。
The controllable catalytic reaction plays a pivotal role in heterogeneous catalysis. Surface-enhanced Raman scattering (SERS) and tip enhanced Raman spectroscopy (TERS) are considered promising techniques for the study of catalytic reactions due to the highly localized sensitivity of SERS and the nanoscale spatial resolution of TERS. Herein, Ag/Au composite films were employed as catalyst for in situ monitoring of the catalytic reaction of 4‑nitrobenzenethiol (4NBT) to p, p′‑dimercaptoazobenzene (DMAB). The catalytic reaction of 4NBT adsorbed on Au film can be manipulated at the nanoscale using TERS by controlling the height between the tip-apex and the sample surface in Ag tip-Au substrate geometry. According to finite difference time domain (FDTD) simulations, the ‘hot electron’ induced by the localized surface plasmon is sufficient for promoting the catalytic reaction. These findings provide a novel way for controllable graph drawing of molecules at the nanoscale level.