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Photoconductivity of substituted polyacetylenes
Author(s) -
Chen Hong Zheng,
Xu Rui Song,
Sun Qunhui,
Lam Jacky W. Y.,
Wang Mang,
Tang Ben Zhong
Publication year - 2000
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/1099-1581(200008/12)11:8/12<442::aid-pat990>3.0.co;2-5
Subject(s) - photosensitivity , polyacetylene , materials science , photochemistry , photoconductivity , doping , mesogen , amorphous solid , crystallography , liquid crystal , liquid crystalline , chemistry , optoelectronics
Photoconduction under visible light illumination is investigated using xerographic discharge technique in the photoreceptors of the following substituted polyacetylenes: [HCC(C 6 H 5 ‐p‐R)] n , [HCC(3‐C 4 H 2 S‐β‐R′)] n , and {HCC[(CH 2 ) m ‐R″]} n , where R = CH 3 ( 2 ), CO 2 (CH 2 ) 6 OCO‐Biph‐OC 7 H 15 (Biph = 4,4′‐biphenylyl; 3 ); R′ = Si(CH 3 ) 3 ( 4 ), Br ( 5 ); and R″ CO 2 (CH 2 ) 6 OCO‐Biph‐OC 9 H 19 (m = 2; 6 ), 9‐carbazolyl (m = 3; 7 ), OCO‐Biph‐OC 7 H 15 (m = 9; 8 ). In the undoped state, 2–4 and 6–8 show much higher photosensitivity than poly(phenylacetylene)(R = H; 1 ). The polyacetylenes with electron‐donating and/or hole‐transporting substituents perform better than do those with electron‐accepting ones. The liquid crystalline polyacetylene 6 exhibits very high photosensitivity, probably because of the crystalline aggregates of its mesogenic pendants. C 60 acts as a photoconductivity enhancer when doped to amorphous 3 but functions as a quencher when mixed with liquid crystalline 6 . While 3 shows low photosensitivity in the undoped state, doping with I 2 and sensitization with crystal violet dramatically increase its photosensitivity up to 41.2 × 10 −3 lx −1 sec −1 . Copyright © 2000 John Wiley & Sons, Ltd.