STM studies of photochemistry and plasmon chemistry on metal surfaces
STM studies of photochemistry and plasmon chemistry on metal surfaces
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DOI：
10.1016/j.progsurf.2018.08.003
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发表时间：
2018-12-01
影响因子：
6.4
通讯作者：
Kim, Yousoo
中科院分区：
文献类型：
--
作者：
Kazuma, Emiko;Jung, Jaehoon;Kim, Yousoo
本文利用扫描隧道显微镜（STM）对金属表面吸附的二甲基二硫化物（CH3S）(2)分子的光化学和等离子体化学进行了综述。STM不仅用于原子空间分辨率的表面结构观测，而且用于局部光谱观测。结合光激发的STM可以用于研究光子和局部表面等离子激元诱导的单分子化学反应。这项技术使我们能够深入了解单分子水平上的反应机制。简要描述了使用STM检查化学反应的实验程序。根据STM实验结果和密度泛函理论计算的电子结构，讨论了吸附在金属表面的（CH3S）(2)分子光解反应的机理。本文还描述了在银尖端和金属衬底之间的STM结中，由光激发等离子体引起的（CH3S）(2)分子的解离反应。并与等离子体化学中的化学反应进行了比较，讨论了等离子体诱导化学反应的机理和途径。
We review our recent studies of photochemistry and plasmon chemistry of dimethyl disulfide, (CH3S)(2), molecules adsorbed on metal surfaces using a scanning tunneling microscope (STM). The STM has been used not only for the observation of surface structures at atomic spatial resolution but also for local spectroscopies. The STM combined with optical excitation by light can be employed to investigate chemical reactions of single molecules induced by photons and localized surface plasmons. This technique allows us to gain insights into reaction mechanisms at a single molecule level. The experimental procedures to examine the chemical reactions using the STM are briefly described. The mechanism for the photodissociation reaction of (CH3S)(2) molecules adsorbed on metal surfaces is discussed based on both the experimental results obtained with the STM and the electronic structures calculated by density functional theory. The dissociation reaction of the (CH3S)(2) molecule induced by the optically excited plasmon in the STM junction between a Ag tip and metal substrate is also described. The reaction mechanism and pathway of this plasmon-induced chemical reaction are discussed by comparison with those proposed in plasmon chemistry.