Ions transport and self-doping in layer-by-layer conducting polymer films |
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| Affiliation: | 1. Institute Center for Water and Environment (iWATER), Masdar Institute of Science and Technology, Abu Dhabi 54224, United Arab Emirates;2. Centre for Water Advanced Technologies and Environmental Research (CWATER), College of Engineering, Swansea University, UK;1. Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Zhenjiang 212013, China;2. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;3. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, China |
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| Abstract: | The self-doping mechanism for charge transport is investigated in layer-by-layer (LBL) films from two conducting polymers, namely poly(o-methoxyaniline) (POMA) and poly(3-thiophene acetic acid) (PTAA). The efficiency of charge intercalation, defined as the ratio between the charge and the mass change, is twice for the POMA/PTAA LBL film in comparison with a cast POMA film. This is attributed to differences in the diffusion-controlled charge and mass transport, where distinct ionic species participate in the LBL films, as demonstrated with experiments using a quartz crystal microbalance. The doping efficiency for LBL film is the same, i.e., 3.93 × 10?4 and 3.56 × 10?4 g/C for the Li+ and (C2H5)4N+ doped films, and is different for the cast POMA film, i.e., 11.3 × 10?4 for Li+ and 6.45 × 10?4 g/C for (C2H5)4N+. Therefore, once no significant differences in the intercalation mechanism are observed when different cations, Li+ or (C2H5)4N+, are used with the LBL films, this indicates that the self-doping mechanism is controlled by the exchange of anions. |
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