Adsorption of cyanine dyes on AgCl crystals studied by XPS |
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| Affiliation: | 1. Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;2. National Institute of Clean-and-Low-Carbon Energy (NICE), Beijing 102211, China;3. School of Environmental Science & Engineering, North China Electric Power University, Baoding 071003, China;1. Institute of Chemistry, University of Tartu, 14a Ravila Str., 50411 Tartu, Estonia;2. Helmholtz Zentrum Berlin, Hahn-Meitner-Platz 1, 14109 Berlin, Germany;3. Institute of Physics, University of Tartu, 14c Ravila Str., 50411 Tartu, Estonia |
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| Abstract: | Adsorption of 3,3'-dimethyl-9-ethylthiacarbocyanine dyes with iodide or bromide counter ions showed two energy states of sulfur in the dye molecule, one is the adsorption state to AgCl substrate and the other occurs when dye molecules aggregated. Though iodide conversion occurred on KI adsorption on AgCl, the counter ion of the dye molecule did not cause halide conversion on adsorption. The counter ion was observed only after the first dye monolayer on AgCl was completed, and increased parallel with adsorbed dye amounts. On Ag-deposited quartz plate monolayer formation occurred only by dye adsorption compared by its counter ion, while only iodine adsorbed in KI adsorption. |
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