Nanojunction-Mediated Photocatalytic Enhancement in Heterostructured CdS/ZnO, CdSe/ZnO, and CdTe/ZnO Nanocrystals
A series of highly efficient semiconductor nanocrystal (NC) photocatalysts have been synthesized by growing wurtzite‐ZnO tetrahedrons around pre‐formed CdS, CdSe, and CdTe quantum dots (QDs). The resulting contact between two small but high‐quality crystals creates novel CdX/ZnO heterostructured sem...
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| Published in | Angewandte Chemie Vol. 126; no. 30; pp. 7972 - 7976 |
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| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | English German |
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Weinheim
WILEY-VCH Verlag
21.07.2014
WILEY‐VCH Verlag Wiley Subscription Services, Inc |
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| Abstract | A series of highly efficient semiconductor nanocrystal (NC) photocatalysts have been synthesized by growing wurtzite‐ZnO tetrahedrons around pre‐formed CdS, CdSe, and CdTe quantum dots (QDs). The resulting contact between two small but high‐quality crystals creates novel CdX/ZnO heterostructured semiconductor nanocrystals (HSNCs) with extensive type‐II nanojunctions that exhibit more efficient photocatalytic decomposition of aqueous organic molecules under UV irradiation. Catalytic testing and characterization indicate that catalytic activity increases as a result of a combination of both the intrinsic chemistry of the chalcogenide anions and the heterojunction structure. Atomic probe tomography (APT) is employed for the first time to probe the spatial characteristics of the nanojunction between cadmium chalcogenide and ZnO crystalline phases, which reveals various degrees of ion exchange between the two crystals to relax large lattice mismatches. In the most extreme case, total encapsulation of CdTe by ZnO as a result of interfacial alloying is observed, with the expected advantage of facilitating hole transport for enhanced exciton separation during catalysis.
Eine Serie von hoch aktiven Halbleiterphotokatalysatoren wurde durch Kristallisation von Wurtzit‐Tetraedern auf CdS‐, CdSe‐ und CdTe‐Quantenpunkten hergestellt. Die heterostrukturierten CdX/ZnO‐Nanokristalle weisen ausgedehnte Typ‐II‐Nanokontakte auf und bewirken die schnelle photokatalytische Zersetzung von organischen Molekülen in wässrigen Medien. |
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| AbstractList | A series of highly efficient semiconductor nanocrystal (NC) photocatalysts have been synthesized by growing wurtzite‐ZnO tetrahedrons around pre‐formed CdS, CdSe, and CdTe quantum dots (QDs). The resulting contact between two small but high‐quality crystals creates novel CdX/ZnO heterostructured semiconductor nanocrystals (HSNCs) with extensive type‐II nanojunctions that exhibit more efficient photocatalytic decomposition of aqueous organic molecules under UV irradiation. Catalytic testing and characterization indicate that catalytic activity increases as a result of a combination of both the intrinsic chemistry of the chalcogenide anions and the heterojunction structure. Atomic probe tomography (APT) is employed for the first time to probe the spatial characteristics of the nanojunction between cadmium chalcogenide and ZnO crystalline phases, which reveals various degrees of ion exchange between the two crystals to relax large lattice mismatches. In the most extreme case, total encapsulation of CdTe by ZnO as a result of interfacial alloying is observed, with the expected advantage of facilitating hole transport for enhanced exciton separation during catalysis. A series of highly efficient semiconductor nanocrystal (NC) photocatalysts have been synthesized by growing wurtzite‐ZnO tetrahedrons around pre‐formed CdS, CdSe, and CdTe quantum dots (QDs). The resulting contact between two small but high‐quality crystals creates novel CdX/ZnO heterostructured semiconductor nanocrystals (HSNCs) with extensive type‐II nanojunctions that exhibit more efficient photocatalytic decomposition of aqueous organic molecules under UV irradiation. Catalytic testing and characterization indicate that catalytic activity increases as a result of a combination of both the intrinsic chemistry of the chalcogenide anions and the heterojunction structure. Atomic probe tomography (APT) is employed for the first time to probe the spatial characteristics of the nanojunction between cadmium chalcogenide and ZnO crystalline phases, which reveals various degrees of ion exchange between the two crystals to relax large lattice mismatches. In the most extreme case, total encapsulation of CdTe by ZnO as a result of interfacial alloying is observed, with the expected advantage of facilitating hole transport for enhanced exciton separation during catalysis. Eine Serie von hoch aktiven Halbleiterphotokatalysatoren wurde durch Kristallisation von Wurtzit‐Tetraedern auf CdS‐, CdSe‐ und CdTe‐Quantenpunkten hergestellt. Die heterostrukturierten CdX/ZnO‐Nanokristalle weisen ausgedehnte Typ‐II‐Nanokontakte auf und bewirken die schnelle photokatalytische Zersetzung von organischen Molekülen in wässrigen Medien. A series of highly efficient semiconductor nanocrystal (NC) photocatalysts have been synthesized by growing wurtzite-ZnO tetrahedrons around pre-formed CdS, CdSe, and CdTe quantum dots (QDs). The resulting contact between two small but high-quality crystals creates novel CdX/ZnO heterostructured semiconductor nanocrystals (HSNCs) with extensive type-II nanojunctions that exhibit more efficient photocatalytic decomposition of aqueous organic molecules under UV irradiation. Catalytic testing and characterization indicate that catalytic activity increases as a result of a combination of both the intrinsic chemistry of the chalcogenide anions and the heterojunction structure. Atomic probe tomography (APT) is employed for the first time to probe the spatial characteristics of the nanojunction between cadmium chalcogenide and ZnO crystalline phases, which reveals various degrees of ion exchange between the two crystals to relax large lattice mismatches. In the most extreme case, total encapsulation of CdTe by ZnO as a result of interfacial alloying is observed, with the expected advantage of facilitating hole transport for enhanced exciton separation during catalysis.Original Abstract: Eine Serie von hoch aktiven Halbleiterphotokatalysatoren wurde durch Kristallisation von Wurtzit-Tetraedern auf CdS-, CdSe- und CdTe-Quantenpunkten hergestellt. Die heterostrukturierten CdX/ZnO-Nanokristalle weisen ausgedehnte Typ-II-Nanokontakte auf und bewirken die schnelle photokatalytische Zersetzung von organischen Molekuelen in waessrigen Medien. |
| Author | Smith, George Li, Tong Tsang, Shik Chi Edman Fairclough, Simon Michael Smith, Jason M. Liao, Fenglin Eley, Clive |
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| Cites_doi | 10.1039/c3nr34327h 10.1039/c2nr33595f 10.1016/S0928-4931(02)00250-3 10.1021/cr00033a004 10.1021/ja9052703 10.1016/j.jphotochem.2008.05.022 10.1021/jp903813h 10.1016/S1010-6030(03)00378-2 10.1166/jnn.2013.6027 10.1016/S0045-6535(02)00787-7 10.1166/jnn.2012.6801 10.1116/1.4816951 10.1002/adma.201102752 10.1007/s11814-007-0114-7 10.1002/anie.201200903 10.1063/1.3567764 10.1021/ja003633m 10.1021/ja111102u 10.1080/15685543.2013.806124 10.1016/j.ultsonch.2011.05.007 10.1063/1.121249 10.1002/ange.201200903 10.1088/0957-4484/23/19/194014 |
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| Notes | The Rhodes Trust This research was supported by The Rhodes Trust and EPRSC doctoral prize funding. TEM was performed by University of St Andrews (UK) through the EPSRC access scheme. ark:/67375/WNG-LP81SCQL-D ArticleID:ANGE201404481 istex:6C3A8E6457883DF560A11C6155B06D510A905162 EPRSC ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
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| SubjectTerms | Cadmium Cadmium selenides Cadmium tellurides Chalcogenides Chemistry Halbleiter Intermetallics Nanocrystals Nanokristalle Nanostructure Photocatalysis Photokatalyse Quantum dots Rastersondentomographie Semiconductors Zinc oxide |
| Title | Nanojunction-Mediated Photocatalytic Enhancement in Heterostructured CdS/ZnO, CdSe/ZnO, and CdTe/ZnO Nanocrystals |
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