Precise measurement of single carbon nanocoils using focused ion beam technique
Precise measurement of single carbon nanocoils using focused ion beam technique
复制标题
DOI：
10.1063/1.4945724
复制
发表时间：
2016-04
影响因子：
4
通讯作者：
Yasushi Nakamura;Y. Suda;Ryuji Kunimoto;Tamio Iida;H. Takikawa;H. Ue;H. Shima
中科院分区：
文献类型：
--
作者：
Yasushi Nakamura;Y. Suda;Ryuji Kunimoto;Tamio Iida;H. Takikawa;H. Ue;H. Shima
我们已经开发了一个精确的电阻率测量系统的准一维纳米材料使用聚焦离子束。该系统能够测量碳纳米线圈（CNC）的电阻率，并阐明其对线圈几何形状的依赖性。在室温下，纳米碳管的电阻率随线圈直径的增加而增加，而人工石墨化纳米碳管的电阻率保持不变。这些对比的行为表明线圈直径引起的增强结构紊乱内部的CNCs。低温电阻率测量显示，通过螺旋轴的电子传输是由可变范围跳跃机制。变程跳跃理论中的特征温度被发现系统地增加线圈直径，这支持我们的理论，在CNCs的sp2-域的人口大大减少线圈直径。
We have developed a precise resistivity measurement system for quasi-one-dimensional nanomaterials using a focused ion beam. The system enables the resistivity of carbon nanocoils (CNCs) to be measured and its dependence on coil geometry to be elucidated. At room temperature, the resistivity of CNCs tended to increase with coil diameter, while that of artificially graphitized CNCs remained constant. These contrasting behaviors indicate coil-diameter-induced enhancement in structural disorder internal to CNCs. Low-temperature resistivity measurements performed on the CNCs revealed that electron transport through the helical axis is governed by the variable range hopping mechanism. The characteristic temperature in variable range hopping theory was found to systematically increase with coil diameter, which supports our theory that the population of sp2-domains in CNCs decreases considerably with coil diameter.