单根聚苯胺纳米线导电性的研究

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.

Conductance of a Single Conducting Polyaniline Nanowire

The combination of template synthesis method of nanowire/nanotube and conductive atomic force mi-croscopy (C-AFM) is an efficient way that can be used to probe the conductivity of single one-dimension nanoma-terial and its array. This communication reports the conductivity of an electrochemically prepared single polyani-line(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 simi-lar 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 un-der 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 ClO-4 ion is lower than that of partial oxidized state by two order of magnitude.