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在苯胺的化学氧化体系中,采用无机纳米微粒二氧化硅作为空间稳定剂,在玻璃基体表面直接制备了透明导电的聚苯胺薄膜,并与水溶性高分子聚乙烯吡咯烷酮(PVP)做稳定剂进行比较。采用SEM、紫外光谱、红外光谱和四探针电导率仪对薄膜的表观形貌、厚度、化学结构和电导率进行了表征。结果表明:稳定剂的存在有效抑制了溶液中宏观沉淀的生成,制得的薄膜表面光滑致密;与水溶性高分子聚乙烯吡咯烷酮(PVP)为稳定剂的情况相比较,纳米SiO2做稳定剂条件下,整个反应体系诱导期相对延长,反应速率相对缓慢,薄膜的生长速度也相对缓慢;薄膜的饱和厚度达到200nm左右,高于聚乙烯吡咯烷酮(PVP)做稳定剂的情况;所得薄膜的电导率要相对低一些,仍属于半导体范围;红外光谱分析发现制备的聚苯胺薄膜中无稳定剂存在,说明稳定剂未参与薄膜的生长聚合。
In the chemical oxidation of aniline, a transparent conductive polyaniline thin film was prepared on the surface of glass substrate by using inorganic nano-silica as a space stabilizer, and was stabilized with a water-soluble polymer of polyvinylpyrrolidone (PVP) Compare The morphology, thickness, chemical structure and electrical conductivity of the films were characterized by SEM, UV, FTIR and four-probe conductivity meter. The results showed that the presence of the stabilizer effectively inhibited the formation of macroporous precipitate in the solution and the surface of the film was smooth and dense. Compared with the case of water-soluble polyvinylpyrrolidone (PVP) as the stabilizer, the nano-SiO2 as the stabilizer , The induction period of the reaction system is relatively longer, the reaction rate is relatively slow, the growth rate of the film is also relatively slow; the saturated thickness of the film reaches about 200nm, higher than polyvinylpyrrolidone (PVP) as a stabilizer; the conductivity of the resulting film Should be relatively low, still belong to the semiconductor range; infrared spectroscopy analysis found no presence of a stabilizer in the prepared polyaniline film, indicating that the stabilizer is not involved in the growth of the film polymerization.