Bridging the Junction: Electrical Conductivity of Carbon Nanotube Networks
Bridging the Junction: Electrical Conductivity of Carbon Nanotube Networks
复制标题
连接的桥梁：碳纳米管网络的导电性
DOI：
10.1021/acs.jpcc.2c03904
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发表时间：
2022-09-30
影响因子：
3.7
通讯作者：
Karttunen, Antti J.
中科院分区：
文献类型：
--
作者：
Conley, Kevin;Karttunen, Antti J.
碳纳米管（CNT）薄膜具有优异的导电性和适合化学传感和触摸屏设备的柔韧性。了解网络内电荷传输的路径对于开发新的功能材料和改进现有设备至关重要。在这里，我们使用量子力学方法和半经典玻尔兹曼输运理论研究了含有 11 族金属（Au、Ag 和 Cu）、s-p 金属（K、Ca 和 Al）、AuCl3、AuCl4 和 Cl 的 CNT 网络的电导率。沿着纳米管和穿过交叉结的电导率被表征。跨结的电导率比沿纳米管的电导率弱得多，并且可以使用掺杂剂在各个方向上增强。电导率的最大增加是由沿纳米管的 Al 和跨交叉点的 Cu 引起的[分别相对于原始 (8,0) 网络分别为 389 倍和 14 倍]。此外，银掺杂剂可激活金属和半导体纳米管混合网络中沿半导体纳米管的电荷传输。沿半导体纳米管的电导率增加了 781 倍。这种激活消除了混合手性网络内沿半导体纳米管的电荷传输瓶颈。纳米管网络中的少量掺杂剂会极大地改变方向电导率，并为化学传感或触摸屏等应用提供电荷传输的新途径。
Carbon nanotube (CNT) films have excellent conductivity and suitable flexibility for chemical sensing and touch screen devices. Understanding the pathways of charge transport within the network is crucial to develop new functional materials and improve existing devices. Here, we study the electrical conductivity of networks of CNTs containing Group 11 metals (Au, Ag, and Cu), s-p metals (K, Ca, and Al), AuCl3, AuCl4, and Cl using quantum mechanical methods and semiclassical Boltzmann transport theory. The conductivity is characterized along the nanotubes and across the intersecting junction. The conductivity is much weaker across the junction than along the nanotubes and could be strengthened in all directions using dopants. The largest increase in conductivity is induced by Al along the nanotubes and by Cu across the intersection [389-fold and 14-fold relative to the pristine (8,0) network, respectively]. Additionally, Ag dopants activate charge transport along the semiconducting nanotube in heterogeneous networks of mixed metal and semiconducting nanotubes. The conductivity along the semiconducting nanotube increased 781-fold. This activation removes the bottleneck of charge transport along the semiconducting nanotubes within the network of mixed chiralities. Small amounts of dopants within nanotube networks drastically change the directional conductivity and provide new pathways for charge transport for applications such as chemical sensing or touch screens.