J. Phys. IV France 03 (1993) C4-253-C4-255
Positron annihilation study in polyaniline conducting polymerZ.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
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.
© EDP Sciences 1993