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Partial Carbonization of Aromatic Polyimide Films

Published online by Cambridge University Press:  10 February 2011

M. Doyama ,
A. Ichida ,
Y. Inoue ,
Y. Kogure ,
T. Nozaki  and
S. Yamada
M. Doyama
Affiliation:
Teikyo University of Science and Technologhy, Yamanashi, Japan
A. Ichida
Affiliation:
Teikyo University of Science and Technologhy, Yamanashi, Japan
Y. Inoue
Affiliation:
Teikyo University of Science and Technologhy, Yamanashi, Japan
Y. Kogure
Affiliation:
Teikyo University of Science and Technologhy, Yamanashi, Japan
T. Nozaki
Affiliation:
Teikyo University of Science and Technologhy, Yamanashi, Japan
S. Yamada
Affiliation:
Teikyo University of Science and Technologhy, Yamanashi, Japan
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Abstract

Aromatic polyimide films are partially carbonized between 700°C and 1000°C. Electrical conductivity and Hall coeficient have been measured. Electrical conductivity is higher at higher measuring temperatures. The electrical conductivity σ can be expressed as σ= σ0exp (–E /kT), where k is the Boltzman constant. T is the absolute temperature. E depends upon the carborized temperature. The experimental data show the Hall coefficient RH is negative, and this implies the carriers are negatively charged, i.e. electrons. The specimens are n-type semiconductors. The carrier density η can be expressed by η= A1 exp (–E1/κT) and carrier mobility μ can be expressed by μ = A1exp ( E2/κT). E, E1andE2 depend upon the carbonized temperature

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 593: Symposium U – Amorphous & Nanostructured Carbon , 1999 , 289
Copyright
Copyright © Materials Research Society 2000

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