硅烯
拉曼光谱
单层
材料科学
化学物理
分子振动
分子
光谱学
自组装单层膜
分子物理学
纳米技术
光电子学
光学
石墨烯
化学
物理
有机化学
量子力学
作者
Shaoxiang Sheng,Jiangbin Wu,Xin Cong,Wenbin Li,Jian Gou,Qing Zhong,Peng Cheng,Ping‐Heng Tan,Lan Chen,Kehui Wu
标识
DOI:10.1103/physrevlett.119.196803
摘要
Combining ultrahigh sensitivity, spatial resolution, and the capability to resolve chemical information, tip-enhanced Raman spectroscopy (TERS) is a powerful tool to study molecules or nanoscale objects. Here we show that TERS can also be a powerful tool in studying two-dimensional materials. We have achieved a 10^{9} Raman signal enhancement and a 0.5 nm spatial resolution using monolayer silicene on Ag(111) as a prototypical 2D material system. Because of the selective enhancement on Raman modes with vertical vibrational components in TERS, our experiment provides direct evidence of the origination of Raman modes in silicene. Furthermore, the ultrahigh sensitivity of TERS allows us to identify different vibrational properties of silicene phases, which differ only in the bucking direction of the Si-Si bonds. Local vibrational features from defects and domain boundaries in silicene can also be identified.
科研通智能强力驱动
Strongly Powered by AbleSci AI