Is the intrinsic thermoelectric power of carbon nanotubes positive?
Is the intrinsic thermoelectric power of carbon nanotubes positive?
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DOI：
10.1103/physrevlett.85.4361
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发表时间：
2000-11-13
影响因子：
8.6
通讯作者：
Zettl, A
中科院分区：
文献类型：
--
作者：
Bradley, K;Jhi, SH;Zettl, A
单壁碳纳米管的温差电势(TEP)对气体暴露历史极为敏感。暴露在空气或氧气中的样品总TEP为阳性，提示为孔状载体。然而，在固定温度下，TEP超过零，随着单壁碳纳米管的氧气被剥离，TEP逐渐变得更负。氧的吸附/解吸时间常数强烈依赖于温度，范围从几秒到几天不等，导致给定样品在给定温度下的TEP明显“可变”。饱和的TEP可以在半导体纳米管的强氧掺杂模型中得到解释。
The thermoelectric power (TEP) of single-walled carbon nanotubes (SWNTs) is extremely sensitive to gas exposure history. Samples exposed to air or oxygen have an always positive TEP, suggestive of holelike carriers. However, at fixed temperature the TEP crosses zero and becomes progressively more negative as the SWNTs are stripped of oxygen. The time constant for oxygen adsorption/desorption is strongly temperature dependent and ranges from seconds to many days, leading to apparently "variable" TEP for a given sample at a given temperature. The saturated TEP can be accounted for within a model of strong oxygen doping of the semiconducting nanotubes.