Charge transport and thermal properties of polyindole, polycarbazole and their derivatives

Abstract

The time and temperature dependences of conductivity of four polymers namely polyindole, polyindole-5-carboxylic acid, polycarbazole, and poly(N-vinylcarbazole) are analysed to understand the aging process and conduction mechanism. The polymers are prepared electrochemically. The conductivity data obtained over a temperature range are fitted to Arrhenius and Mott equations. The thermal degradation of both doped and dedoped samples of the four polymers in air and N 2 atmosphere has been followed using thermogravimetric (TG) and differential thermal analysis (DTA). The thermal activation energies are evaluated by Horowitz and Metzger method.

Electrodeposition of High-quality Polycarbazole Films in Composite Electrolytes of Boron Trifluoride Diethyl Etherate and Ethyl Ether

“…Many statements of the structure and polymerization mechanism of PCZ are translated from polypyrrole or polyindole studies. Therefore, extensive work has been devoted to the study of PCZ in the past several years [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Electrochemical performance of chemically synthesized oligo-indole as a positive electrode for lithium rechargeable batteries

“…Broad X-ray diffraction peaks in Fig. 4 is contrary to that of PI with high molecular weight, which showed high thermal stability [4] and small weight loss of about 20% even up to 400°C [8]. The low molecular weight of OI consisting of about 3 indole units may be the cause of the low thermal stability.…”

“…The preparation of PI can be achieved by polymerization of indole monomer, C 8 NH 7 . Many studies involving PI have been carried out by utilizing the electropolymerization of indole [2][3][4][5][6][7][8] because it is easy to obtain the PI film electrodeposited on the substrate electrode, which can then be conveniently used as a test sample without modification. In the wet-process of making rechargeable battery electrodes, however, chemical polymerization of indole is required to obtain a homogeneous, highly-conducting PI powder with a high yield.…”

Electrosyntheses of Freestanding and Conducting Poly[poly(N-vinyl-carbazole)] Films in Tetrahydrofuran Containing Additional Boron Trifluoride Diethyl Etherate

“…This value was much higher than that of PVK precursor (4 Â 10 À6 S cm À1 ). 47 Moreover, the doping level of as-formed PPVK films were determined to be close to 21%. These semiconducting properties will be greatly helpful for the applications of PPVK films.…”