超细0.4nm直径单壁碳管的光学特性(英文)  

Optical Properties of 0.4nm Single-walled Carbon Nanotubes

作　　者：汤子康[1,2] 李赵明[1,2] 萧旭东[1,2] 葛惟琨[1,2] 

机构地区：[1]香港科技大学物理系 [2]纳米科学和技术研究所

出　　处：《发光学报》2002年第4期335-340,共6页Chinese Journal of Luminescence

基　　金：香港科技大学资助项目RGC grant HKUST 6152/99P

摘　　要：由于纳米碳管的优异机械特性及其丰富多采的光学和电学特性,它自1991年被发现以来一直受到科学家的青睐。纳米碳管研究已成为当今世界上发展最迅速,竞争最激烈的科学前沿领域之一。怎样才能把纳米碳管做得更细小,尺寸更均匀以及如何使众多的纳米碳管排列规整,一直是纳米碳管研究中的难题。我们利用多孔的沸石晶体作为载体,首次成功地研制出了尺寸均一,排列规整的超细单壁纳米碳管。这些超细纳米碳管具有独特的性能,低温下（<20K）甚至呈现出前所未有的一维超导现象。详细介绍了这些超细单壁纳米碳管的制备过程,并着重介绍其在可见光区的光吸收,光发射以及二次谐波的倍频特性。We report the polarized optical absorption and photoluminescence spectra of single-walled 0.4nm carbon nanotubes (SWNTs) arrayed in the channels of an AlPO4-5(AFI)single crystal. When the light electric field(E) is polarized parallel to the tube direction( c ), the absorption spectrum display a sharp peak at 1.37eV with two broad bands at 2.1eV and 3.1eV.The intensities of these absorption bands gradually decrease as the polarization angle is varied from 0° (E||c) to 90°(E┻c).In the E┻Lc configuration, the tube is nearly transparent in the measured energy region of 0.5-4.1eV. The photoluminescence observed around 700nm also shows strong polarization dependence. Under high power excitation using the fundamental frequency of a YAG laser, the sample shows strong nonlinear up-conversion emission around 700nm and high efficient second-harmonic generation. The mechanism of the nonlinear photoluminescence and SHG is not clear yet.

关 键 词：碳纳米管 光学特性 偏振吸收 光致发光 超细单壁纳米碳管 

分 类 号：O613.71[理学—无机化学] TB383[理学—化学]