Synthesis of a polypyrrole film on a non-conducting substrate; the influence of the oxidant and acid concentration |
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| Affiliation: | 1. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China;2. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;3. College of Agricultural and Biotechnology, China Agricultural University, Beijing 100193, China;4. School of Resources and Environmental, Anhui Agricultural University, Hefei 230036, China;5. Institute of Resources Environmental and Detection Technology, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Huhhot 010031, China;6. College of Agronomy, Shenyang Agricultural University, Shenyang 110866, China;7. Wuchuan Scientific Observing and Experimental Station of Agro-Environment, Ministry of Agriculture Wuchuan 011700, China |
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| Abstract: | Thin films of conducting polypyrrole are deposited on a non-conducting substrate by dipping the substrate in a pyrrole solution and subsequently in an oxidising solution containing Fe(ClO4)3 and HClO4. In this last step pyrrole is polymerised by Fe3+. Calculations on the influence of the acid concentration on the Fe3+ hydrolysis equilibria are in good agreement with UV/VIS and pH measurements. These calculations and experiments in which HClO4 is replaced by LiClO4, show that the polymerisation rate of pyrrole is determined by the perchlorate concentration and not by the acid concentration. We conclude that the perchlorate ions promote the dimerisation of the radical cations by reducing the electrical repulsion between the radical cations; therefore the dimerisation of the radical cations is the rate-determining step. |
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