Zhang Jinjiang, Zhou Ruifeng, Minamimoto Hiro, Yasuda Satoshi, Murakoshi Kei
Graduate School of Chemical Sciences and Engineering , Hokkaido University , Sapporo 060-8628 , Japan.
Department of Chemistry, Faculty of Science , Hokkaido University , Sapporo 060-0810 , Japan.
Nano Lett. 2019 Nov 13;19(11):7887-7894. doi: 10.1021/acs.nanolett.9b02947. Epub 2019 Oct 2.
Electrochemical surface-enhanced Raman scattering measurements of single layer graphene provide unique information on resonant excitation induced by localized surface plasmons under controlled electron or hole doping. The highly confined electromagnetic field from the LSPs of the Au nanodimer structures prepared on defect-free graphene can generate holes and electrons of the electrochemical potentials beyond the limit of far-field light illumination. The electrochemical in situ SERS spectra prove nonzero wavevector excitation through the observation of normally forbidden Raman bands in graphene. The present findings point to a novel approach to breaking the limit of optoelectronic interactions and photochemical reactions of graphene and other semiconductors.
单层石墨烯的电化学表面增强拉曼散射测量提供了关于在可控电子或空穴掺杂下由局域表面等离子体激元诱导的共振激发的独特信息。在无缺陷石墨烯上制备的金纳米二聚体结构的局域表面等离子体激元产生的高度受限电磁场，能够产生超出远场光照射极限的电化学势的空穴和电子。电化学原位表面增强拉曼散射光谱通过观察石墨烯中通常被禁止的拉曼带，证明了非零波矢激发。目前的研究结果指出了一种打破石墨烯和其他半导体的光电相互作用及光化学反应极限的新方法。
