Visible LED light photoelectrochemical sensor for detection of L-Dopa based on oxygen reduction on TiO2 sensitized with iron phthalocyanine |
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Institution: | 1. Analytical Chemistry Department, Faculty of Pharmacy, Iuliu Haţieganu University of Medicine and Pharmacy, 4 Louis Pasteur St, 400349 Cluj-Napoca, Romania;2. National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat St., 400293 Cluj-Napoca, Romania |
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Abstract: | The present work describes the development of a new strategy to photoelectrochemical detection of L-Dopa at low potential based on oxygen reduction on TiO2 sensitized with iron phthalocyanine (FePc/TiO2). The FePc/TiO2 composite shows a photocurrent 10-fold higher than that of pure TiO2 nanoparticles and it was 4-fold higher than that of FePc exploiting visible light. The band gaps of pure TiO2 nanoparticles, FePc and FePc/TiO2, calculated according to the Kubelka–Munk equation, were 3.22 eV, 3.11 eV and 2.82 eV, respectively. The FePc/TiO2 composite showed a low charge transfer resistance in comparison to the photoelectrode modified with FePc or TiO2. Under optimized conditions, the photoelectrochemical sensor shows a linear response range from 20 up to 190 μmol L− 1 with a sensitivity of 31.8 μA L mmol− 1 and limit of detection of 1.5 μmol L− 1 for the detection of L-Dopa. |
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