Spectroscopic characterization of Stone-Wales defects in nanotubes
Spectroscopic characterization of Stone-Wales defects in nanotubes
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DOI：
10.1103/physrevb.69.121413
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发表时间：
2004-03
影响因子：
3.7
通讯作者：
Y. Miyamoto;Á. Rubio;S. Berber;M. Yoon;D. Tománek
中科院分区：
文献类型：
--
作者：
Y. Miyamoto;Á. Rubio;S. Berber;M. Yoon;D. Tománek
我们将共振光吸收和振动光谱与扫描隧道显微镜 ~STM 结合起来！明确识别 Stone-Wales ~SW 的存在！碳和氮化硼纳米管中的缺陷。基于广泛的时间相关的从头算密度泛函计算，我们建议在红外和紫外范围内共振光激发SW缺陷作为识别它们的手段。频率为1962 cm 21 的局部缺陷振动的非辐射衰变的开始充当碳纳米管中此类缺陷的指纹。 STM 图像的偏差依赖性显示了与 SW 缺陷的存在相关的独特特征。
We combined resonant photoabsorption and vibration spectroscopy with scanning tunneling microscopy ~STM! to unambiguously identify the presence of Stone-Wales ~SW! defects in carbon and boron nitride nanotubes. Based on extensive time-dependent ab initio density functional calculations, we propose to resonantly photoexcite SW defects in the infrared and ultraviolet regime as a means of their identification. Onset of nonradiative decay to a local defect vibration with a frequency of 1962 cm 21 serves as a fingerprint of such defects in carbon nanotubes. The bias dependence of the STM images shows distinct features associated with the presence of SW defects.