Abstract
A layer-by-layer (LbL) film assembly was constructed that comprises alternative layers of poly(diphenylamine) (PDPA) and phosphotungstic acid (PTA). First, a layer of oxidized PDPA (referred to as PDPA(+)) was deposited by electropolymerization. Then, a layer of negatively charged PTA was deposited on the PDPA(+) layer . This processes was repeated several times to obtain multilayer LbL film (PDPA/PTA)n, where n is the number of double layers. The LbLs were characterized by UV-Vis spectroscopy, FT-IR spectroscopy and X- ray diffraction spectroscopy. The process of formation of the LbL assembly was monitored by electrochemical methods. Electrochemical studies revealed that this LbL film possesses a remarkable electrocatalytic activity towards oxidation of ascorbic acid in neutral aqueous medium. The enhanced electrocatalytic activity of (PDPA/PTA)n LbL film is attributed to the existence of tungsten atoms in the interlayers of PDPA.
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Acknowledgements
This research was supported by KOSEF-2008-05994 and Korean Research Foundation Grant (KRF-2006-C00001). The authors acknowledge the Korea Basic Science Institute (Daegu and Daejon, Korea) and Kyungpook National University Center for Scientific Instrument.
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Ragupathy, D., Gopalan, A.I. & Lee, KP. Layer-by-layer electrochemical assembly of poly(diphenylamine)/phosphotungstic acid as ascorbic acid sensor. Microchim Acta 166, 303–310 (2009). https://doi.org/10.1007/s00604-009-0201-z
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DOI: https://doi.org/10.1007/s00604-009-0201-z