物理化学学报 >> 2005, Vol. 21 >> Issue (04): 343-346.doi: 10.3866/PKU.WHXB20050401

通讯    下一篇

单根聚苯胺纳米线导电性的研究

蔡成东; 周剑章; 齐丽; 席燕燕; 蓝碧波; 吴玲玲; 林仲华   

  1. 厦门大学固体表面物理化学国家重点实验室, 化学化工学院化学系, 物理化学研究所, 厦门 361005
  • 收稿日期:2004-12-30 修回日期:2005-02-22 发布日期:2005-04-15
  • 通讯作者: 林仲华 E-mail:zhlin@xmu.edu.cn

Conductance of a Single Conducting Polyaniline Nanowire

CAI Cheng-Dong; ZHOU Jian-Zhang; QI Li; XI Yan-Yan; LAN Bi-Bo; WU Ling-Ling; LIN Zhong-Hua   

  1. State Key Laboratory of Physical Chemistry of the Solid Surface,Department of Chemistry,College of Chemistry and Chemical Engineering,Institute of Physical Chemistry,Xiamen University,Xiamen 361005
  • Received:2004-12-30 Revised:2005-02-22 Published:2005-04-15
  • Contact: LIN Zhong-Hua E-mail:zhlin@xmu.edu.cn

摘要: 纳米线(管)的模板合成和导电原子力显微镜(C-AFM)结合是一种近期发展起来研究单根一维纳米结构及阵列导电性的有效方法. 本文利用C-AFM测量了阳极氧化铝(AAO)模板电化学合成制备的单根聚苯胺纳米线的电导率, 研究了直径、氧化还原态对单根聚苯胺纳米线电导率的影响. 从I-V曲线可以看到, 其导电性质与半导体类似,但又不同于半导体. 尚未观察到反向击穿现象,可能原因是, 在一定的反向偏压下的离子脱嵌使得它由部分氧化态(导电态)转变为还原态(绝缘态);电导率随纳米线直径减小而线性地增加;以ClO4离子掺杂的氧化态和还原态比部分氧化态的电导率低二个数量级.

关键词: 聚苯胺, 摇单根纳米线, C-AFM, 电导率

Abstract: The combination of template synthesis method of nanowire/nanotube and conductive atomic force microscopy (C-AFM) is an efficient way that can be used to probe the conductivity of single one-dimension nanomaterial and its array. This communication reports the conductivity of an electrochemically prepared single polyaniline (PANI) nanowire determined using C-AFM and dependences of the conductivity on its diameter and redox state. Our preliminary results of measured current-voltage curves show that the volt-ampere characteristic is similar to that of semiconductor, except that reverse breakdown characteristic has not been observed in the bias range of our test. The possible reason is that the conducting partial oxidized state is reduced into insulating reduced state under the applied reverse bias. The conductivity is lineally increased while the decrease of the diameter of nanowire. Meanwhile, the conductivity of oxidized state and reduced state doped with ClO4 ion is lower than that of partial oxidized state by two order of magnitude.

Key words: Polyaniline, Single nanowire, C-AFM, Conductivity