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Issue 28, 2015
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In situ high-energy synchrotron X-ray diffraction revealing precipitation reaction kinetics of silver ions with mixed halide ions

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Abstract

Precipitation of silver ions simultaneously with chloride and bromide ions in ethylene glycol at a mild temperature (e.g., 60 °C) has been successfully demonstrated for the synthesis of silver chlorobromide (AgClxBr1−x, 0 < x < 1) nanoparticles, which is realized by injecting a AgNO3 solution into a solution containing both halogen ions. The injection rate of the AgNO3 solution has been determined to be critical for controlling the uniformity of AgClxBr1−x nanoparticles. Time-resolved in situ high-energy synchrotron X-ray diffraction has been applied, for the first time, to quantitatively monitor the reaction kinetics of nanocrystal formation. The real-time results shed light on the fact that the injection rate of AgNO3 solution significantly influences the nucleation and growth processes, and thus the quality of resulting AgClxBr1−x nanoparticles. Specifically, fast injection enables the complete addition of AgNO3 solution to the reaction solution before the nucleation process starts, leading to a good separation of nucleation and growth and thus the formation of uniform AgClxBr1−x nanocubes with well-defined composition and narrow size distribution. By contrast, slow injection results in a continuous addition of AgNO3 solution to the reaction solution even after nucleation starts, leading to continuous multiple nucleation/growth processes and thus the formation of AgClxBr1−x nanoparticles with broad dimensional and morphological distributions.

Graphical abstract: In situ high-energy synchrotron X-ray diffraction revealing precipitation reaction kinetics of silver ions with mixed halide ions

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Supplementary files

Article information


Submitted
08 May 2015
Accepted
17 Jun 2015
First published
18 Jun 2015

J. Mater. Chem. C, 2015,3, 7492-7498
Article type
Paper

In situ high-energy synchrotron X-ray diffraction revealing precipitation reaction kinetics of silver ions with mixed halide ions

Q. Liu, Z. Li, J. S. Okasinski, Y. Ren and Y. Sun, J. Mater. Chem. C, 2015, 3, 7492
DOI: 10.1039/C5TC01306B

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