Purification of Single Wall Carbon Nanotubes As a Function of UV Wavelength, Atmosphere, and Temperature

被引：20
作者：
Hurst, Katherine E. [1 ]
Dillon, Anne C. [2 ]
Yang, Shao [1 ]
Lehman, John H. [1 ]
机构：
[1] Natl Inst Stand & Technol, Boulder, CO 80305 USA
[2] Natl Renewable Energy Lab, Golden, CO 80401 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 42期
关键词：
D O I：
10.1021/jp804201y
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We investigate the purification of as-prepared single wall carbon nanotubes (SWCNTs) by exposure to pulsed 193 and 248 nm laser light, as well as lamp wavelengths of 254 and 185 mn. Raman spectroscopy before and after laser exposure indicates the removal of non-nanotube material without modification of the distribution of tube diameter for material exposed to a 248 nm laser, while 193 nm laser light does not selectively oxidize carbon impurities. The mechanism of purification is further considered in the context of atmosphere (oxygen, ozone, nitrogen or partial vacuum) and temperature (measured average and calculated maximum). A mathematical model for pulsed laser heating is used to estimate the maximum temperature achieved during laser excitation. We attribute the purification of nanotube samples to photophysical interactions of the pulsed 248 nm photons in resonance with sp(2) carbon.
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收藏
页码：16296 / 16300
页数：5
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