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Substitutional doping of carbon nanotubes to control their electromagnetic characteristics

机译:碳纳米管的替代掺杂以控制其电磁特性

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摘要

Substitutional doping of bundles and composite materials, containing a mixture of semiconducting and metallic single-wall carbon nanotubes (SWNTs), by either nitrogen or boron atoms substantially alters their electromagnetic characteristics in the terahertz and the far-infrared regimes. Metallization of semiconducting SWNTs caused by doping exclusively by either boron or nitrogen increases the axial polarizability, the antenna efficiency, and the intensity enhancement factor of SWNT bundles; likewise, the conductivity of SWNT-based composite materials is enhanced by substitutional doping. The frequencies of the antenna resonances in the axial-polarizability spectra of the doped bundles are blueshifted in comparison with the resonance frequencies in the undoped ones. The doping-caused enhancement of the effective conductivity of SWNT-based composite materials in the far-infrared regime may occur not only due to the enhancement of conductivities of single SWNTs but also due to the decrease in the depolarizing field.
机译:包含半导体和金属单壁碳纳米管(SWNT)混合物的束和复合材料的替代掺杂,无论是氮原子还是硼原子,都会在太赫兹和远红外范围内大大改变其电磁特性。仅由硼或氮掺杂引起的半导体SWNT的金属化会增加SWNT束的轴向极化率,天线效率和强度增强因子;同样,SWNT基复合材料的电导率可通过置换掺杂来提高。与未掺杂束的谐振频率相比,掺杂束的轴向极化率谱中的天线谐振频率发生蓝移。掺杂引起的SWNT基复合材料在远红外状态下有效电导率的提高可能不仅由于单个SWNTs的电导率提高,而且还由于去极化场的减小而发生。

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