Synthesis of Spatially Uniform Metal Alloys Nanocrystals via a Diffusion Controlled Growth Strategy: The Case of Au–Pd Alloy Trisoctahedral Nanocrystals with Tunable Composition
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Zhaoxiong Xie(
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Rational synthesis of bimetallic alloy nanocrystals (NCs) is still a great challenge. Especially, spatially uniform alloy NCs are very difficult to achieve because of the different reduction rates of the individual alloy components. Herein we propose a facile wet chemical synthetic strategy to prepare uniform bimetallic alloy NCs with tunable composition by controlling the growth of alloy NCs under diffusion controlled conditions. Using this strategy, we successfully synthesized trisoctahedral (TOH) Au–Pd alloy NCs enclosed by {hhl} high-index facets with uniform spatial distributions and different compositions. Significantly, using our strategy, the composition of the as-prepared Au–Pd alloy NCs is identical to the ratio of the two metal precursors in the reaction solution over a wide range. Investigation of the composition-dependent electrochemical behavior of the as-prepared TOH Au–Pd alloy NCs showed that the TOH Au–Pd alloy NCs containing 14.1 atom% Pd exhibited the best activity.
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Synthesis of Spatially Uniform Metal Alloys Nanocrystals via a Diffusion Controlled Growth Strategy: The Case of Au–Pd Alloy Trisoctahedral Nanocrystals with Tunable Composition
), Zhaoxiong Xie(
),
Abstract
Rational synthesis of bimetallic alloy nanocrystals (NCs) is still a great challenge. Especially, spatially uniform alloy NCs are very difficult to achieve because of the different reduction rates of the individual alloy components. Herein we propose a facile wet chemical synthetic strategy to prepare uniform bimetallic alloy NCs with tunable composition by controlling the growth of alloy NCs under diffusion controlled conditions. Using this strategy, we successfully synthesized trisoctahedral (TOH) Au–Pd alloy NCs enclosed by {hhl} high-index facets with uniform spatial distributions and different compositions. Significantly, using our strategy, the composition of the as-prepared Au–Pd alloy NCs is identical to the ratio of the two metal precursors in the reaction solution over a wide range. Investigation of the composition-dependent electrochemical behavior of the as-prepared TOH Au–Pd alloy NCs showed that the TOH Au–Pd alloy NCs containing 14.1 atom% Pd exhibited the best activity.
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Acknowledgements
This work was supported by the National Basic Research Program of China (Grant Nos. 2011CBA00508), the National Natural Science Foundation of China (Grant Nos. 21131005, 21021061, and 21073145), and Key Scientific Project of Fujian Province of China (Grant No. 2009HZ0002-1).
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