Photoelectrochemical study of organic–inorganic hybrid thin films via electrostatic layer-by-layer assembly |
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| Institution: | 1. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824-1226, United States;2. Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, VA 23529-0126, United States;3. U.S. Army Corps of Engineers, Engineer Research and Development Center, Construction Engineering Research Laboratory (CERL), P.O. Box 9005, Champaign, IL 61826-9005, United States;1. Institute of Physics, Polish Academy of Sciences, Warsaw, Poland;2. University of Rzeszow, Rzeszow, Poland;3. Drogobych Pedagogical University, Drogobych, Ukraine |
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| Abstract: | The stepwise assembly of negatively charged organic molecules (poly(sodium 4-styrenesulfonate) (PSS) or tetrasodium-meso-tetra(4-sulfonatophenyl) porphine (TPPS)) and positively charged TiO2 colloids on pretreated substrate surfaces utilizing the layer-by-layer (LbL) approach was investigated. The step-by-step formation of these films was studied by UV–vis spectrophotometry and electrochemistry. Photocurrent was generated upon light irradiation of the hybrid thin films assembled on fluorine-doped tin oxide (FTO) conducting glass, which increased linearly as the deposited bilayers increased. In addition, compared to PSS/TiO2 hybrid thin films, the enhancement of the generated photocurrent and the photocurrent response within the wavelength range from 400 to 450 nm were observed in the TPPS/TiO2 hybrid thin films. This was attributed to the dye-sensitized effect of the layered TPPS molecules. It was demonstrated that electrostatic LbL films were attractive systems for the photoelectrochemical investigation, and the control of the generated photocurrent could be achieved by the structure of the multilayered films. |
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