Synthesis And Thermoelectric Properties Of Polyaniline

Polyaniline possess several attractive features for use as thermoelectric elements comparable to the tranditionary inorganic semiconductor. They are cheap, light-weight, and flexible. They have, furthermore, low thermal conductivity, thus opening up the possibility of thermoelectric applications in practice. In this article, we determined the potential of polyaniline for thermoelectric applications.Polyaniline was obtained as a fine powder by the chemical oxidation, and researches for effects of the doping parameters for electric conductivity, Seebeck coefficient and their thermoelectric efficiency were carried but. The results indicated that the synthesized temperature has little effect on the thermoelectric properties of polyaniline. The thermoelectric efficiency could improve by the appropriate rate of Polyaniline to oxidant and he muriatic acid concentration.The FT-IR, X-ray (XRD) and TG were carried out to determined the effect of the structural change resulted from HC1 doping, then electric conductivity, Seebeck coefficient, and thermal conductivity of Polyaniline under different doping level were measured. The results indicated that eigen Polyaniline is amorphous, whereas the doped one is partially crystalline and the information of crystal wasn't the main factor for thermoelectric properties. The electric conductivity increased by ten order and the thermostability was worse after the doping. With the PH value of muriatic acid varied from 0.5 to 2, electric conductivity decreased and Seebeck coefficient improved. The value of ZT changed slightly before PH=1.5, and it suddenly increased to 0.019 at 303K while PH=2, which increased by ten order, so the increases of PH is be propitious to the value of ZT.Electrical conductivity, Seebeck coefficient at different temperature, and thermal conductivity at room temperature for various doped PAn samples were measured , and compared their thermoelectric efficiency Effects of molecular weight of PAn, doping level, classes of proton acid and temperature on conductivity, Seebeck coefficient and ZT were discussed by measure results. The results are also shown that thermal conductivity is less dependent of microcosmic molecular structure, thus ZT is mainly determined by polymers' Seebeck coefficient and electric conductivity. We have put forward the method to obtain more Seebeck coefficient.