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Issue 9, 2018
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Novel cone-like ZnO mesocrystals with co-exposed (10[1 with combining macron]1) and (000[1 with combining macron]) facets and enhanced photocatalytic activity

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Abstract

Unusual designated-tailoring on the preferential growth of ZnO meso-/nanocrystals with different shapes and sizes was successfully achieved through a very facile precursor-hydrolysis process in a water/organic solvent system. The shape-evolution of ZnO from mesocrystal to nanocrystal was achieved by increasing the amount of water in the reaction system under otherwise the same conditions, which can be attributed to selective-capping and preferential growth mechanisms based on DFT calculations. Typically, nanoparticle-aggregated cone-like ZnO mesocrystals enclosed by curved (10[1 with combining macron]1) and flat (000[1 with combining macron]) surfaces were prepared in a lower amount of water, while various ZnO crystals without curved (10[1 with combining macron]1) surfaces were synthesized in a higher amount of water. In particular, “surface heterojunctions” were constructed in cone-like ZnO mesocrystals with co-exposed curved (10[1 with combining macron]1) and flat (000[1 with combining macron]) surfaces, and these displayed greater photocatalytic degradation of methyl orange dye compared to the ZnO nanocrystals. This investigation is of great significance to the synthesis of additive-free ZnO mesocrystals, and offers a good opportunity to understand the formation mechanism and fundamental significance of the preferential growth of ZnO mesocrystals. Importantly, it is believed that the water-induced synthetic strategy reported here could provide a promising way to design more and more metal oxide architectures with controllable morphologies.

Graphical abstract: Novel cone-like ZnO mesocrystals with co-exposed (10 [[1 with combining macron]] 1) and (000 [[1 with combining macron]] ) facets and enhanced photocatalytic activity

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Publication details

The article was received on 24 May 2018, accepted on 07 Jul 2018 and first published on 10 Jul 2018


Article type: Research Article
DOI: 10.1039/C8QI00481A
Citation: Inorg. Chem. Front., 2018,5, 2257-2267
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    Novel cone-like ZnO mesocrystals with co-exposed (10[1 with combining macron]1) and (000[1 with combining macron]) facets and enhanced photocatalytic activity

    S. Liang, X. Gou, J. Cui, Y. Luo, H. Qu, T. Zhang, Z. Yang, Q. Yang and S. Sun, Inorg. Chem. Front., 2018, 5, 2257
    DOI: 10.1039/C8QI00481A

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