Photoinduced protonation of polyaniline assisted by hydrogen-bonding materials |
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Authors: | Zheng Shi Valentine K Johns Candace Alber Yi Liao |
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Affiliation: | Chemistry Department, University of Central Florida, FL, USA |
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Abstract: | Composites of the emeraldine base form of polyaniline (PANI-EB) and photo-acid generators (PAGs) increase their conductivities upon photo-irradiation due to protonation of PANI-EB. Such materials may be utilized to fabricate conducting patterns by photo-irradiation. However, the conductivity obtained by direct irradiation of PANI-EB/PAG composites was normally quite low, and conductivity above 10?3 S cm?1 often required post-treatment with HCl. In this work, poly(vinyl alcohol) (PVA), which can form a hydrogen bonding network, was added to PANI-EB/PAG. Results showed that PVA enhanced film quality, conductivity and reproducibility. Photo-induced conductivity of 10?2 S cm?1 was obtained when the ratio of PANI-EB/PVA/PAG was 1:1:0.6. A novel PAG, bis(p-hydroxyphenyl)phenylsulfoniumtriflate (PhOH)2PhS+ OTf?], which can form hydrogen bonds with PANI was synthesized and mixed with PANI-EB. A composite of PANI-EB and the PAG with a ratio of 1:0.5 achieved a conductivity of 10?1 S cm?1 after irradiation. However, the initial conductivity before irradiation was as high as 10?5 S cm?1 due to relatively high acidity of the PAG. |
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