Relationship between the structure of carbon nanocoils and their electrical property
Relationship between the structure of carbon nanocoils and their electrical property
复制标题
DOI：
10.1016/j.carbon.2014.02.038
复制
发表时间：
2014-07
期刊：
影响因子：
10.9
通讯作者：
He Ma;K. Nakata;L. Pan;K. Hirahara;Y. Nakayama
中科院分区：
文献类型：
--
作者：
He Ma;K. Nakata;L. Pan;K. Hirahara;Y. Nakayama
采用四探针技术研究了碳纳米线圈在300 ~ 2900 K温度范围内退火后的电学性质。结果表明，随着退火温度的升高，由于结晶度的提高，CNCs的电阻率降低，且电阻率的变化在CNCs结构变化初期最为显著。除了测量退火的CNCs的室温电阻率之外，还测量了退火的CNCs的温度依赖性电阻。根据最近邻跳跃机制，计算了退火后CNCs中电子跳跃的平均激活能，发现随着CNCs结构的改善，平均激活能降低。研究还发现，平均活化能的变化也对CNCs的初始结构变化敏感。最后，通过对膨胀状态下CNC的电性能的研究，发现CNC的电阻不随伸长而变化。
The electrical property of carbon nanocoils (CNCs) annealed from 300 to 2900 K has been studied by a four-probe technique. It was shown that the resistivity of the CNCs decreased with the increase of the annealing temperature owing to the improvement of crystallinity and the most notable change of resistivity occurred at the initial structure change of the CNCs. Besides the measurement of room-temperature resistivity of the annealed CNCs, temperature-dependent resistance of the annealed CNCs was also measured. According to the nearest neighboring hopping mechanism, the average activation energy for electron hopping in the annealed CNCs was calculated, which indicated that the average activation energy reduced with the structural improvement of CNCs. It was also found that the variation of average activation energy was also sensitive to the initial structural change of CNCs. Finally, through studying the electrical property of the CNCs under expansion, it was found that the resistance of the CNC was not changed with elongation.