Oriented Attachment Kinetics for Ligand Capped Nanocrystals: Coarsening of Thiol-PbS Nanoparticles

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• 作者：Jing Zhang ; Yonghao Wang ; Jinsheng Zheng ; Feng Huang ; Dagui Chen ; Youzhao Lan ; Guoqiang Ren ; Zhang Lin ; Chen Wang
• 刊名：Journal of Physical Chemistry B
• 出版年：2007
• 出版时间：February 15, 2007
• 年：2007
• 卷：111
• 期：6
• 页码：1449 - 1454
• 全文大小：455K
• 年卷期：v.111,no.6(February 15, 2007)
• ISSN：1520-5207

文摘

In this work, the growth kinetics of thiol-capped PbS nanoparticles was studied. Two-stage growth processwas observed, which was controlled first by oriented attachment (OA) mechanism and then by the hybridOstwald ripening (OR) and OA mechanism. Different from the NaOH-ZnS system, where OA will occurbetween any two multilevel nanoparticles, an OA kinetic model only considering the attachment related tooriginal particles was fitted well with the experimental results. Analysis reveals that this model may be auniversal one to describe the OA crystal growth process of nanocrystals capped with easily destroyed ligands,such as thiol-ZnS in the previous report. The OA crystal growth characteristics determined by the surfaceagent were discussed and compared. We propose that with stronger surface capping, the OR growth ofnanocrystals is hindered, which facilitates the size controlling via OA kinetics during nanosynthesis.