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Issue 8, 2017
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Ternary silver chlorobromide nanocrystals: intrinsic influence of size and morphology on photocatalytic activity

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Abstract

It is found that magnetic stirring can significantly influence diffusion of reaction species in high-viscosity solutions and thus the nucleation process of forming nanocrystals. This simple strategy, for the first time, has been successfully used to control the synthesis of phase-pure ternary silver chlorobromide (AgClxBr1−x) nanoparticles with varying sizes and morphologies while maintaining constant composition through co-precipitation reaction of Ag+ cations with both Cl and Br anions at different stirring rates. The as-synthesized AgClxBr1−x nanoparticles offer the unique opportunity to accurately study the dependence of their photocatalytic activity on particle size and morphology by taking photocatalytic decomposition of MB as an example: (1) in a solution with a high concentration of dissolved O2, particle size represents the dominating parameter and larger particles are more active than small particles; (2) with low concentrations of dissolved O2, particle morphology becomes more dominating and nanocubes (mainly bound by {100} surface facets) are more efficient than nanospheres (mainly bound by {111} surface facets) towards decomposition of MB molecules. The results provide an unprecedented insight into the rational design and synthesis of efficient photocatalysts.

Graphical abstract: Ternary silver chlorobromide nanocrystals: intrinsic influence of size and morphology on photocatalytic activity

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The article was received on 31 Jan 2017, accepted on 08 Mar 2017 and first published on 09 Mar 2017


Article type: Research Article
DOI: 10.1039/C7QM00046D
Citation: Mater. Chem. Front., 2017,1, 1534-1540
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    Ternary silver chlorobromide nanocrystals: intrinsic influence of size and morphology on photocatalytic activity

    S. C. Abeyweera and Y. Sun, Mater. Chem. Front., 2017, 1, 1534
    DOI: 10.1039/C7QM00046D

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