Size effects on structural and optical properties of tin oxide quantum dots with enhanced quantum confinement
Size-controllable tin oxide (SnO2) quantum dots (QDs) in aqueous solution were prepared by using stannous chloride and thiourea as source materials and the hydrothermal treatment was employed for size control during the self-assembly of SnO2 QDs. The size effects on structural and optical properties...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785420313077 |
| _version_ | 1818269158685540352 |
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| author | Jianqiao Liu Yichen Nie Weiting Xue Liting Wu Hao Jin Guohua Jin Zhaoxia Zhai Ce Fu |
| author_facet | Jianqiao Liu Yichen Nie Weiting Xue Liting Wu Hao Jin Guohua Jin Zhaoxia Zhai Ce Fu |
| author_sort | Jianqiao Liu |
| collection | DOAJ |
| description | Size-controllable tin oxide (SnO2) quantum dots (QDs) in aqueous solution were prepared by using stannous chloride and thiourea as source materials and the hydrothermal treatment was employed for size control during the self-assembly of SnO2 QDs. The size effects on structural and optical properties of QDs were discussed. The prepared QDs were confirmed to be of rutile structure with (2 0 2), (2 1 1) and (3 3 0) facets observed. The crystal lattice constants changed their dimensions during grain growth and secondary grain boundaries appeared if grain size was over 7 nm. The composition and valence states were found independent with grain size. A negative correlation was observed between size and band gap, which exhibited much greater values than the calculation results from the theory of effective mass approximation and illustrated a strong quantum confinement in the present SnO2 QDs. The size effect of photoluminescence property illustrated a fluorescence inhibition, which could be ascribed to the additional energy levels provided by the lattice distortions at secondary grain boundaries. The depletion region in QDs was extended by these defects, which strengthened the quantum confinement effect. |
| first_indexed | 2024-12-12T20:49:56Z |
| format | Article |
| id | doaj.art-617fed9191ad45e8a8335aea451ea8ce |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-12T20:49:56Z |
| publishDate | 2020-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-617fed9191ad45e8a8335aea451ea8ce2022-12-22T00:12:26ZengElsevierJournal of Materials Research and Technology2238-78542020-07-019480208028Size effects on structural and optical properties of tin oxide quantum dots with enhanced quantum confinementJianqiao Liu0Yichen Nie1Weiting Xue2Liting Wu3Hao Jin4Guohua Jin5Zhaoxia Zhai6Ce Fu7Corresponding authors.; College of Information Science and Technology, Dalian Maritime University, Dalian 116026, Liaoning, PR ChinaCollege of Information Science and Technology, Dalian Maritime University, Dalian 116026, Liaoning, PR ChinaCollege of Information Science and Technology, Dalian Maritime University, Dalian 116026, Liaoning, PR ChinaCollege of Information Science and Technology, Dalian Maritime University, Dalian 116026, Liaoning, PR ChinaCollege of Information Science and Technology, Dalian Maritime University, Dalian 116026, Liaoning, PR ChinaCollege of Information Science and Technology, Dalian Maritime University, Dalian 116026, Liaoning, PR ChinaCollege of Information Science and Technology, Dalian Maritime University, Dalian 116026, Liaoning, PR ChinaCorresponding authors.; College of Information Science and Technology, Dalian Maritime University, Dalian 116026, Liaoning, PR ChinaSize-controllable tin oxide (SnO2) quantum dots (QDs) in aqueous solution were prepared by using stannous chloride and thiourea as source materials and the hydrothermal treatment was employed for size control during the self-assembly of SnO2 QDs. The size effects on structural and optical properties of QDs were discussed. The prepared QDs were confirmed to be of rutile structure with (2 0 2), (2 1 1) and (3 3 0) facets observed. The crystal lattice constants changed their dimensions during grain growth and secondary grain boundaries appeared if grain size was over 7 nm. The composition and valence states were found independent with grain size. A negative correlation was observed between size and band gap, which exhibited much greater values than the calculation results from the theory of effective mass approximation and illustrated a strong quantum confinement in the present SnO2 QDs. The size effect of photoluminescence property illustrated a fluorescence inhibition, which could be ascribed to the additional energy levels provided by the lattice distortions at secondary grain boundaries. The depletion region in QDs was extended by these defects, which strengthened the quantum confinement effect.http://www.sciencedirect.com/science/article/pii/S2238785420313077Tin oxideQuantum dotsSize effectOptical propertyConfinement effect |
| spellingShingle | Jianqiao Liu Yichen Nie Weiting Xue Liting Wu Hao Jin Guohua Jin Zhaoxia Zhai Ce Fu Size effects on structural and optical properties of tin oxide quantum dots with enhanced quantum confinement Journal of Materials Research and Technology Tin oxide Quantum dots Size effect Optical property Confinement effect |
| title | Size effects on structural and optical properties of tin oxide quantum dots with enhanced quantum confinement |
| title_full | Size effects on structural and optical properties of tin oxide quantum dots with enhanced quantum confinement |
| title_fullStr | Size effects on structural and optical properties of tin oxide quantum dots with enhanced quantum confinement |
| title_full_unstemmed | Size effects on structural and optical properties of tin oxide quantum dots with enhanced quantum confinement |
| title_short | Size effects on structural and optical properties of tin oxide quantum dots with enhanced quantum confinement |
| title_sort | size effects on structural and optical properties of tin oxide quantum dots with enhanced quantum confinement |
| topic | Tin oxide Quantum dots Size effect Optical property Confinement effect |
| url | http://www.sciencedirect.com/science/article/pii/S2238785420313077 |
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