Fast Detection of the Metallic State of Individual Single-Walled Carbon Nanotubes Using a Transient-Absorption Optical Microscope
Fast Detection of the Metallic State of Individual Single-Walled Carbon Nanotubes Using a Transient-Absorption Optical Microscope
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DOI：
10.1103/physrevlett.105.217401
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发表时间：
2010-11-15
影响因子：
8.6
通讯作者：
Cheng, Ji-Xin
中科院分区：
文献类型：
--
作者：
Jung, Yookyung;Slipchenko, Mikhail N.;Cheng, Ji-Xin
尽管单壁碳纳米管（SWNTs）具有优异的性能，但由于合成过程中金属和半导体SWNTs的共存，阻碍了它们的电子和光子应用。我们展示了一种泵-探针显微镜方法，用于快速，无接触地绘制单个单壁碳纳米管中的金属丰度。我们采用瞬态吸收的相位作为对比来区分金属和半导体单壁碳纳米管。此外，我们已经澄清的泵浦或探测波长和单壁碳纳米管的能量结构的相位依赖性。我们的成像方法具有作为高速金属性映射工具的潜力，以协助开发基于SWNT的纳米电子学。
In spite of the outstanding properties of single-walled carbon nanotubes (SWNTs), the coexistence of metallic and semiconducting SWNTs as a result of synthesis has hindered their electronic and photonic applications. We demonstrate a pump-probe microscopy method for fast, contact-free mapping of metallicity in individual SWNTs. We employ the phase of transient absorption as a contrast to discriminate metallic and semiconducting SWNTs. Furthermore, we have clarified the phase dependence on the pump or probe wavelengths and the energy structure of SWNTs. Our imaging method holds the potential of serving as a high-speed metallicity-mapping tool to assist the development of SWNT-based nanoelectronics.