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Indexed by:期刊论文

Date of Publication:2010-08-01

Journal:SOLID STATE SCIENCES

Included Journals:SCIE

Volume:12

Issue:8

Page Number:1374-1381

ISSN No.:1293-2558

Key Words:Doped-PANI; Electric conduction; Dielectric properties; Debye relaxation; Microwave absorption

Abstract:Redoped-polyaniline (PANI) was prepared by chemical redox polymerization of aniline using ammonium perdisulfate, (NH4)(2)S(2)O(8), as an oxidant and hydrochloric acid, HCl, as a doping agent. The structural characterization based on FT-IR, UV-vis, XRD, TEM and electrical conductivity was first used to evaluate the thermal stability and the electromagnetic properties. The redoped-PANI was partial crystalline nature and similar spherical structure about 4-5 nm in diameter. The redoped-PANI displayed outstanding electric conduction and thermally stability. The volume resistivity was as high as 5.18 x 10(-1) Omega cm. Doped-PANI maintained stable conductibility at temperatures up to about 100 degrees C. The redoped-PANI had excellent dielectric properties, multiple Debye dipolar relaxation, and substantial microwave absorption capability. The values of epsilon(r)' and epsilon(r)'' for the redoped-PANI powder were from 9.31 to 5.95 and 3.44 to 2.10, respectively. The maximum reflection loss of redoped-PANI composites of 2.0 mm thickness were -14.3 dB at 16.4 GHz and the effective absorption band under -10 dB was from 10.0 to 13 GHz. (C) 2010 Elsevier Masson SAS. All rights reserved.