Band Structure Dependent Electronic Localization in Macroscopic Films of Single-Chirality Single-Wall Carbon Nanotubes
Band Structure Dependent Electronic Localization in Macroscopic Films of Single-Chirality Single-Wall Carbon Nanotubes
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DOI：
10.1016/j.carbon.2021.07.057
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发表时间：
2021-01
期刊：
影响因子：
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通讯作者：
Weilu Gao;Davoud Adinehloo;Ali Mojibpour;Yohei Yomogida;A. Hirano;Takeshi Tanaka;H. Kataura;M. Zheng;V. Perebeinos;J. Kono
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作者：
Weilu Gao;Davoud Adinehloo;Ali Mojibpour;Yohei Yomogida;A. Hirano;Takeshi Tanaka;H. Kataura;M. Zheng;V. Perebeinos;J. Kono
在过去的几十年里，人们对单壁碳纳米管（SWCNT）的手性依赖性质有了很大的了解，主要是通过单管研究。然而，手性依赖性的宏观表现受到限制，特别是在电子输运中，尽管这种独特的行为是基于单壁碳纳米管的设备的许多应用所需要的。此外，开发可靠的传输理论是具有挑战性的，因为在组装的纳米物体的本地化现象的描述需要在多个空间尺度上的混乱的精确知识，特别是如果合奏是异构的。在这里，我们报告了在单手征单壁碳纳米管宏观薄膜的温度和磁场相关电导率测量中观察到明显的手征相关电子定位。样品包括大禁带半导体（6，5）和（10，3）薄膜、窄禁带半导体（7，4）和（8，5）薄膜以及扶手椅金属（6，6）薄膜。实验数据和理论计算表明，莫特可变范围跳跃占主导地位的运输在所有样品中，而本地化长度分为三个不同的类别，这取决于他们的带隙。纸上谈兵的电影本地化长度最大。我们对单手性单壁碳纳米管薄膜的电子输运性质的详细分析为纳米物体的电子输运提供了重要的新见解，为设计和部署宏观单壁碳纳米管固态器件提供了基础。
Significant understanding has been achieved over the last few decades regarding chirality-dependent properties of single-wall carbon nanotubes (SWCNTs), primarily through single-tube studies. However, macroscopic manifestations of chirality dependence have been limited, especially in electronic transport, despite the fact that such distinct behaviors are needed for many applications of SWCNT-based devices. In addition, developing reliable transport theory is challenging since a description of localization phenomena in an assembly of nanoobjects requires precise knowledge of disorder on multiple spatial scales, particularly if the ensemble is heterogeneous. Here, we report an observation of pronounced chirality-dependent electronic localization in temperature and magnetic field dependent conductivity measurements on macroscopic films of single-chirality SWCNTs. The samples included large-gap semiconducting (6,5) and (10,3) films, narrow-gap semiconducting (7,4) and (8,5) films, and armchair metallic (6,6) films. Experimental data and theoretical calculations revealed Mott variable-range-hopping dominated transport in all samples, while localization lengths fall into three distinct categories depending on their band gaps. Armchair films have the largest localization length. Our detailed analyses on electronic transport properties of single-chirality SWCNT films provide significant new insight into electronic transport in ensembles of nanoobjects, offering foundations for designing and deploying macroscopic SWCNT solid-state devices.