Based on the study of a new type of conducting polymer poly (3, 4-ethylenedioxythiophene)(PEDOT), we focussed on the preparation and characteristics of PEDOT nanoparticles made by reversed micelle method. Moreover, we deeply investigated the optical, electrical and the thermal stability of PEDOT nanoparticles. The main results are as follows: the small-sized PEDOT nanoparticles were prepared and utilized by different methods, such as ultraviolet/visible (UV-Vis) spectroscopy, Fourier-transform infrared (FTIR) spectrum, scanning electron microscopy(SEM) and so on. The results show that the amount of oxidizer,ultrasonic treatment, polymerizing temperature and doping degree can influent morphology, electrical ability and gas sensitivity of PEDOT nanoparticles. The Bragg peaks of nanoparticles at 6.7°, 12.7°, 25° were observed by XRD and the better orientation of molecular chain was attributed to the effective doping of toluene-p-sulfonic acid, which also resulted in an enhancement of thermal stability ofnanoparticles than conventional PEDOT.
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