Numéro
J. Phys. IV France
Volume 03, Numéro C4, Septembre 1993
4th International Workshop on Positron and Positronium Chemistry
Page(s) C4-253 - C4-255
DOI http://dx.doi.org/10.1051/jp4:1993438
4th International Workshop on Positron and Positronium Chemistry

J. Phys. IV France 03 (1993) C4-253-C4-255

DOI: 10.1051/jp4:1993438

Positron annihilation study in polyaniline conducting polymer

Z.L. PENG1, S.Q. LI1, Y.Q. DAI1, B. WANG1, S.J. WANG1, H. LIU2 and H.Q. XIE3

1  Department of Physics, Wuhan University, Wuhan 430072, P.R. of China
2  Dept. of Chem., Huazhong Univ. of Sci. & Tech., Wuhan 430072, P.R. of China
3  Dept. of Chem., Huazhong Univ. of Sci. [MATH] Tech., Wuhan 430072, P.R. of China


Abstract
The positron lifetime spectra in polyaniline have been measured as a function of protonation level (pH from 7 to -0.8). We observed that (1) the short lifetime τ1 decreased with the protonation level ; (2) the intermediate lifetime was constant (τ2 ≈ 360 ps), whereas its intensity I2 increased with increasing protonation level which was related to the conductivity of material. These results are discussed in terms of conducting island model.



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