Optical properties of TiO2 and disperse red-19 composite |
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| Affiliation: | 1. Department of New and Renewable Energy, Kyungil University, 50 Gamasilgil Hayangup Gyeongsan, Gyeongbuk 712-701, South Korea;2. Department of Chemical Engineering, Kyungil University, 50 Gamasilgil Hayangup Gyeongsan, Gyeongbuk 712-701, South Korea;1. Karpenko Physico-Mechanical Institute, 5 Naukova Str., 79601 Lviv, Ukraine;2. Lviv Polytechnic National University, 12 S. Bandery Str., 79013 Lviv, Ukraine;1. U.S. Army Research Laboratory, Attn: RDRL-SEE-L, 2800 Powder Mill Road, Adelphi, MD 20783-1138, USA;2. Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright Patterson Air Force Base, OH 45433, USA;3. Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108-6050, USA;1. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. Department of Physics, University of Science and Technology of China, Hefei 230026, PR China |
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| Abstract: | Characteristic absorption and photoluminescence (PL) of TiO2 and disperse red-19 (DR-19) composite have been investigated. Two step synthetic processes were employed to incorporate the DR-19 to the TiO2 sol–gel. Firstly, urethane bonds between the DR-19 ( OH) and 3-isocyanatopropyl triethoxysilane (ICPTES, N CO) were fabricated (ICPDR) prior incorporation to the TiO2 sol–gel. Secondary, hydrolysis of the ethoxy group from the ICPDR and condensation reaction between silanol groups from ICPDR and TiO2 sol–gel were performed by adding ICPDR to the TiO2 sol–gel and aged for several days at room temperature (ICPDRTiO2). There was no absorption peak shift with increasing the DR-19 concentration in methanol. However, UV–visible absorption band was shifted toward red approximately 0.09 eV for the ICPDRTiO2 film, which indicated the formation of dimmer or more aggregates. The PL peaks of ICPDRTiO2 were red-shifted compared with DR-19 in methanol (0.12 eV) and ICPDR film (0.09 eV). The relatively large emission peak shift toward red could be due to the fluorescence resonance energy transfer (FRET) between DR-19 and TiO2 in ICPDRTiO2 matrix. |
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| Keywords: | FRET Photoluminescence Disperse red-19 ICPTES |
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