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Issue 1, 2015
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Silver chlorobromide nanocubes with significantly improved uniformity: synthesis and assembly into photonic crystals

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Abstract

Silver chlorobromide (AgClxBr1−x, 0 < x < 1) nanocubes with a highly uniform size, morphology, and crystallinity have been successfully synthesized through a co-precipitation of Ag+ ions with both Cl and Br ions in ethylene glycol containing polyvinyl pyrrolidone at mild temperatures. Compositions of the synthesized nanocubes can be easily tuned by controlling the molar ratio of Cl to Br ions in the reaction solutions. The size of the nanocubes is determined by varying a number of parameters including the molar ratio of Cl to Br ions, injection rate of Ag+ ions, and reaction temperature. The real-time formation of colloidal AgClxBr1−x nanocubes has been monitored, for the first time, by in situ high-energy synchrotron X-ray diffraction. The time-resolved results reveal that a fast injection rate of Ag+ ions is critical for the formation of AgClxBr1−x nanocubes with a highly pure face-centered cubic crystalline phase. The improved uniformity of the AgClxBr1−x nanocubes is beneficial for assembling them into order superlattices (e.g., photonic crystals) even by simply applying centrifugation forces. The stop band of the resulting photonic crystals can be easily tuned from the ultraviolet to the infrared region by using AgClxBr1−x nanocubes with different sizes. The variation of the dielectric constant of AgClxBr1−x associated with the change of the relative concentration of halide ions provides an additional knob to tune the optical properties of photonic crystals.

Graphical abstract: Silver chlorobromide nanocubes with significantly improved uniformity: synthesis and assembly into photonic crystals

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Publication details

The article was received on 18 Sep 2014, accepted on 06 Oct 2014 and first published on 27 Oct 2014


Article type: Paper
DOI: 10.1039/C4TC02102A
Citation: J. Mater. Chem. C, 2015,3, 58-65
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    Silver chlorobromide nanocubes with significantly improved uniformity: synthesis and assembly into photonic crystals

    Z. Li, J. S. Okasinski, D. J. Gosztola, Y. Ren and Y. Sun, J. Mater. Chem. C, 2015, 3, 58
    DOI: 10.1039/C4TC02102A

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