Phosphomolybdic acid-modified highly organized TiO2 nanotube arrays with rapid photochromic performance |
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| Affiliation: | 1. Key Lab of Groundwater Resources and Environment Ministry of Education, College of New Energy and Environment, Jilin University, Changchun 130021, China;2. Key Laboratory of Songliao Aquatic Environment Ministry of Educatio, Jilin Jianzhu University, Changchun 130118, China;1. State Key Laboratory of Luminescence and Applications Changchun Institute of Optics, Fine Mechanics and Physics Chinese Academy of Sciences, No. 3888 Dongnanhu Road, Changchun 130033, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. School of Chemistry & Chemical Engineering, Anhui Province Key Laboratory of Environment-friendly Polymer Materials, Anhui University, Hefei 230601, Anhui, PR China;4. School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Controllable Chemistry Reaction & Material Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China;1. Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China;2. Beijing Advanced Innovation Centre for Biomedical Engineering, Beihang University, Beijing 102402, China;3. Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China;1. TKL of Metal and Molecule Based Material Chemistry, National Institute for Advanced Materials, School of Materials Science and Engineering, Nankai University, Tianjin 300350, China;2. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China;1. Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, Brazil;2. Institute of Chemical Sciences, University of Peshawar, Peshawar 25120, KPK, Pakistan;3. Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, Brazil;4. Laboratório de Caracterização Estrutural, Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, São Carlos 13565-905, Brazil;5. SIMAP and LEPMI Laboratories CNRS UMR 5266, INPG – UJF, 38402 Saint, Martin d''Hères, France |
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| Abstract: | TiO2 nanotube arrays were prepared by means of an electrochemical anodization technique in an organic electrolyte solution doped with polyvinyl pyrrolidone (PVP) and were subsequently modified with phosphomolybdic acid (PMoA) to obtain PMoA/TiO2 nanotube arrays. The microstructure and photochromic properties were investigated via X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet–visible spectroscopy (UV–vis), and X-ray photoelectron spectroscopy (XPS). The results indicated that the Keggin structure of PMoA and the nanotube structure of TiO2 were not destroyed, and there was a strong degree of interaction between PMoA and TiO2 at the biphasic interface with lattice interlacing during the compositing process. The XPS results further indicated that there was a change in the chemical microenvironment during the formation process of the composite, and a new charge transfer bridge was formed through the Mo-O-Ti bond. Under visible light irradiation, the colorless PMoA/TiO2 nanotube array quickly turned blue and exhibited a photochromic response together with reversible photochromism in the presence of H2O2. After visible light irradiation for 60 s, the appearance of Mo5+ species in the XPS spectra indicated a photoreduction process in accordance with a photoinduced electron transfer mechanism. |
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| Keywords: | Phosphomolybdic acid Rapid Photochromic performance |
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