Influence of Gas Adsorption on Optical Transition Energies of Single-Walled Carbon Nanotubes
Influence of Gas Adsorption on Optical Transition Energies of Single-Walled Carbon Nanotubes
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DOI：
10.1021/nl801074j
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发表时间：
2008-10-01
期刊：
影响因子：
10.8
通讯作者：
Homma, Yoshikazu
中科院分区：
文献类型：
--
作者：
Chiashi, Shohei;Watanabe, Satoshi;Homma, Yoshikazu
在乙醇气氛中，测量了悬浮单壁碳纳米管（SWNTs）的光致发光谱。当气体压力降低时，PL峰最初蓝移到一个小的程度，然后在一个过渡压力下发生快速蓝移，这取决于温度和直径的单壁碳纳米管被测量。这种压力依赖性是由于乙醇分子在单壁碳纳米管表面上的吸附。在转变压力以下测量的光学转变能是单壁碳纳米管固有的。
The photoluminescence (PL) spectra of suspended single-walled carbon nanotubes (SWNTs) were measured in an ethanol gas atmosphere. When the gas pressure was decreased, the PL peaks were initially blue-shifted to a small extent before a rapid blue-shift took place at a transition pressure that depended on the temperature and diameter of the SWNT being measured. This pressure dependence is due to the adsorption of ethanol molecules on the SWNT surface. The optical transition energies measured below the transition pressure are intrinsic to the SWNT.