Terahertz spectra of multi-walled carbon nanotubes with different parameters
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摘要: 探索不同管径和长度的多壁碳纳米管（MWCNT）的太赫兹（THz）谱特性,采用透射型太赫兹时域光谱系统研究了5个不同管径和长度的MWCNT样品的太赫兹吸收谱和折射率谱,并对比和分析了它们的差异。结果表明：在0.2～2.0 THz内,多壁碳纳米管太赫兹吸收没有特征吸收峰,吸收强度随着频率的增加而增加,并可以拟合为不同斜率的直线,且MWCNT在THz波段的吸收强度与管径和长度成正比。折射率随着频率的增加呈指数衰减,同时,管径是影响其折射率的一个重要因素,而长度对其影响不大。Abstract: The terahertz time-domain spectroscopy (THz-TDS) was applied to investigate the characteristics of terahertz absorption spectra and refractivities of multi-walled carbon nanotubes (MWCNTs). Five types of MWCNTs with different tube diameters and lengths were studied. The experiment results show that, in the frequency range of 0.2 to 2.0 THz, no characteristic absorption of MWCNTs is found but the absorption strengths increase with the frequency, which can be fitted into lines with different slopes. Furthermore, the terahertz absorption strengths of MWCNTs are proportional to the tube diameters and lengths. However, the refractivities decrease exponentially with the increase of frequency. The tube diameter is an important factor affecting the refractivities, while the influence of tube length can be neglected.
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