利用亚纳米分辨率的 tips-enhanced Raman 光谱成像技术对单个碳纳米管进行成像。

Tip-Enhanced Raman Spectroscopic Imaging of Individual Carbon Nanotubes with Subnanometer Resolution.

机构信息

Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, China.

出版信息

Nano Lett. 2016 Jul 13;16(7):4040-6. doi: 10.1021/acs.nanolett.6b00533. Epub 2016 Jun 30.

DOI:10.1021/acs.nanolett.6b00533

PMID:27348072

Abstract

Individual carbon nanotubes (CNTs) have been investigated by tip-enhanced Raman spectroscopy (TERS) using silver tips on the Ag(111) substrate with a low-temperature ultrahigh-vacuum scanning tunneling microscope. Thanks to the strong and highly localized plasmonic field offered by the silver nanogap, the spatial resolution of TERS on CNTs is driven down to about 0.7 nm. Such a high spatial resolution allows to visualize in real space the spatial extent of the defect-induced D-band scattering, to track the strain-induced spectral evolution, and to resolve the spectral differences between the inner and the outer sides of a bent CNT, all at the nanometer scale.

摘要

采用低温超高真空扫描隧道显微镜上的银针尖，通过尖端增强拉曼光谱（TERS）对单个碳纳米管（CNT）进行了研究。由于银纳米间隙提供的强且高度局域的等离子体场，TERS 对 CNT 的空间分辨率降低到约 0.7nm。如此高的空间分辨率使得可以在实空间中可视化缺陷诱导的 D 带散射的空间范围，跟踪应变诱导的光谱演化，并分辨弯曲 CNT 的内、外侧之间的光谱差异，所有这些都在纳米尺度上。