Journal of Microwave Power
and Electromagnetic Energy (JMPEE) |
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TITLE |
Electrical Conductivity of Microwave Heated
Polyaniline Nanotubes and Possible Mechanism of Microwave Absorption by
Materials [PDF] |
AUTHORS |
Takahiro
Murai, Ryo Fukasawa, Tohru Muraoka, Hiroyuki Takauchi, Yasuo Gotoh, Tokihiro
Takizawa and Takehiro Matsuse 2009 43 1 34-43 |
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PAGES |
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Abstract In the course of experiments to
perform deprotonation and carbonization of doped polyaniline (PANI) nanotubes
(NTs) by irradiating directly 2.45 GHz microwave (MW) in our microwave
heating system (MWHS), we have discovered that the PANI-NTs self heat by
absorbing the MW, but the temperature of the PANI-NTs stops rising around By measuring electron spin resonance (ESR) spectra of the MW heated PANI-NTs, the existence of the unpaired electrons is shown to have a strong correlation between the degree of MW absorption and the transition in the electrical conductivities. In order to deprotonate and
carbonize further the PANI-NTs, we have performed heat treatment for the
PANI-NTs up to a temperature of about The chemical transformations in the PANI-NTs induced by the heat treatments are discussed by measuring the X-ray photoelectron spectroscopy (XPS) spectra. Finally, the temperature dependence of electrical conductivities of the PANI-NTs are measured in order to investigate the mechanism of electrical conduction of the heat treated PANI-NTs. Key Words: PANI nano-tube, microwave absorption, deprotonation and carbonization, electrical conductivity, ESR-spectra, unpaired electron, XPS-spectra : |