Sunlight assisted photodegradation by tin oxide quantum dots |
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| Institution: | 1. Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores, Ministry of Education, School of Materials and Metallurgy, Northeastern University, Shenyang 100819, China;2. Northeast Petroleum University at Qinhuangdao, Qinhuandao 066004, China;1. National Institute of Materials Physics, 105 bis Atomistilor Street, P.O. Box MG-7, Bucharest-Magurele 077125, Romania;2. National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, P.O. Box MG-36, Bucharest-Magurele 077125, Romania;3. University of Bucharest, Faculty of Physics, 405 Atomistilor Street, P.O. Box MG-11, Bucharest-Magurele 077125, Romania;1. School of Materials Science and Engineering, University of Jinan, Jinan 250022, China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China;1. Voronezh State University, Universitetskaya pl., 1, 394006 Voronezh, Russia;2. Ioffe Physical and Technical Institute, Polytekhnicheskaya, 26, 194021 St-Petersburg, Russia;3. Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Privada 17 Norte, No 3417, Col San Miguel Hueyotlipan, 72050 Puebla, Pue., Mexico;4. Karlsruhe Nano Micro Facility, H.-von-Helmholtz-Platz, 1, 76344 Eggenstein-Leopoldshafen, Germany |
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| Abstract: | Rutile phase of SnO2 quantum dots of average size of 2.5 nm were synthesized at a growth temperature of 70 °C and characterized with XRD, TEM, FTIR and Raman analysis. The effective strain within the lattice of SnO2 quantum dots was calculated by Williamson–Hall method. The broad peaks in XRD as well as Raman spectra and the presence of Raman bands at 569 and 432 cm?1 are due to lower crystallinity of nanoparticles. The optical band gap of SnO2 quantum dots was increased to 3.75 eV attributed to the quantum size effect. SnO2 quantum dots were annealed in air atmosphere and the crystallite size of the particles increased with annealing temperature. Sunlight assisted photodegration property of SnO2 quantum dots was investigated with vanillin as a model system and it shows the photodegradation efficiency of 87%. The photoluminescence and photodegradation efficiency of nanocrystallite SnO2 decreases with increase of crystallite size contributed to the reduction in population of defects and surface area. |
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| Keywords: | Oxides Chemical synthesis Raman spectroscopy Defects Luminescence |
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