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Quantitative Analysis of the Reduction Kinetics of a Pt(Ⅱ) Precursor in the Context of Pt Nanocrystal Synthesis
Shan Zhou,Tung-Han Yang,Ming Zhao,Younan Xia*
Author NameAffiliationE-mail
Shan Zhou School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, USA  
Tung-Han Yang The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, USA  
Ming Zhao School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, USA  
Younan Xia* School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, USA;The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, USA younan.xia@bme.gatech.edu 
Abstract:
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.
Key words:  Kinetic model  Nanocrystal synthesis  Precursor reduction
FundProject: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.
铂纳米晶合成中二价前驱体的还原动力学研究
周山,杨东翰,赵明,夏幼南*
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DOI:10.1063/1674-0068/31/cjcp1805121
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