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Eley C, Li T, Liao F, et al. Nanojunction-mediated photocatalytic enhancement in heterostructured CdS/ZnO, CdSe/ZnO, and CdTe/ZnO nanocrystals. Angew Chem Int Ed Engl. 2014;53(30):7838-42doi: 10.1002/anie.201404481.
Eley, C., Li, T., Liao, F., Fairclough, S. M., Smith, J. M., Smith, G., & Tsang, S. C. (2014). Nanojunction-mediated photocatalytic enhancement in heterostructured CdS/ZnO, CdSe/ZnO, and CdTe/ZnO nanocrystals. Angewandte Chemie (International ed. in English), 53(30), 7838-42. https://doi.org/10.1002/anie.201404481
Eley, Clive, et al. "Nanojunction-mediated photocatalytic enhancement in heterostructured CdS/ZnO, CdSe/ZnO, and CdTe/ZnO nanocrystals." Angewandte Chemie (International ed. in English) vol. 53,30 (2014): 7838-42. doi: https://doi.org/10.1002/anie.201404481
Eley C, Li T, Liao F, Fairclough SM, Smith JM, Smith G, Tsang SC. Nanojunction-mediated photocatalytic enhancement in heterostructured CdS/ZnO, CdSe/ZnO, and CdTe/ZnO nanocrystals. Angew Chem Int Ed Engl. 2014 Jul 21;53(30):7838-42. doi: 10.1002/anie.201404481. Epub 2014 Jun 24. PMID: 24962739.
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Angew Chem Int Ed Engl. 2014 Jul 21;53(30):7838-42. doi: 10.1002/anie.201404481. Epub 2014 Jun 24.

Nanojunction-mediated photocatalytic enhancement in heterostructured CdS/ZnO, CdSe/ZnO, and CdTe/ZnO nanocrystals.

Angewandte Chemie (International ed. in English)

Clive Eley, Tong Li, Fenglin Liao, Simon Michael Fairclough, Jason M Smith, George Smith, Shik Chi Edman Tsang

Affiliations

  1. Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR (UK).

PMID: 24962739 DOI: 10.1002/anie.201404481

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.

© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: atomic probe tomography; cadmium; nanocrystals; photocatalysis; semiconductors

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