纳米VO2/PEDT复合膜的制备及阻温特性的研究

将纳米VO2粉体与聚3,4-乙撑二氧噻吩复合,制备出一种新型的负电阻温度系数特性的聚合物基复合材料。通过计算复合膜简化模型的等效电阻网络,结果表明串联电阻结构有利于复合膜表现出高电阻相二氧化钒的电阻温度特性。同时,由于掺杂过的VO2粉体相和聚3,4-乙撑二氧噻吩导电聚合物相的共同作用,这种复合膜的电阻随温度变化量可达到一个数量级以上。最后,给出了复合膜的扫描电子显微镜图像结构。

Preparation and Temperature Coefficient of Resistance Characteristics of Nano-VO2/PEDT Composite

In this paper, the preparation and Temperature Coefficient of Resistance (TCR) characteristic of nano-VO2 powder/Poly(3,4-ethylenedioxythiophene) composite is described. A simplified model of equivalent resistance of the composite was given and the results of calculation showed that the structure of series resistance leaded to the Negative Temperature Coefficient (NTC) characteristic of the composite, which was owned by the high resistance ingredient of the composite. The test results of resistance showed a change of above one order of magnitude due to the cooperation of the doped nano-VO2 powder and the electrical conductivity of poly(3,4-ethylenedioxythiophene). The surface morphology of films were studied by scanning electron microscope.