铂纳米晶合成中二价前驱体的还原动力学研究 |
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作者姓名: | 周山 杨东翰 赵明 夏幼南 |
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作者单位: | 美国佐治亚理工学院 化学与生物化学系, 亚特兰大, 佐治亚 30332,美国佐治亚理工学院与埃默里大学生物医学工程系, 亚特兰大, 佐治亚 30332,美国佐治亚理工学院 化学与生物化学系, 亚特兰大, 佐治亚 30332,美国佐治亚理工学院 化学与生物化学系, 亚特兰大, 佐治亚 30332;美国佐治亚理工学院与埃默里大学生物医学工程系, 亚特兰大, 佐治亚 30332 |
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基金项目: | This work was supported in part by a grant from National Science Foundation of the United States (DMR-1505441) and startup funds from the Georgia Institute of Technology. |
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摘 要: | In this letter, we report a quantitative analysis of how a Pt(Ⅱ) precursor is reduced to atoms at different temperatures for the formation of Pt nanocrystals with different morphologies and sizes. Our results suggest that in the early stage of a synthesis, the Pt(Ⅱ) precursor is reduced to atoms exclusively in the solution phase, followed by homogeneous nucleation to generate nuclei and then seeds. At a relatively low reaction temperature such as 22℃, the growth of the seeds is dominated by autocatalytic surface reduction that involves the adsorption and then reduction of the Pt(Ⅱ) precursor on the surface of the just-formed seeds. This particular growth pathway results in relatively large assemblies of Pt nanocrystals. When the reaction temperature is increased to 100℃, the dominant reduction pathway will be switched from surface to solution phase, producing much smaller assemblies of Pt nanocrystals. Our results also demonstrate that a similar trend applies to the seed-mediated growth of Pt nanocrystals in the presence of Pd nanocubes.
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收稿时间: | 2018-05-29 |
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