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Facet‐Dependent On‐Surface Reactions in the Growth of CdSe Nanoplatelets
Author(s) -
Zhu Chenqi,
Chen Dongdong,
Cao Weicheng,
Lai Runchen,
Pu Chaodan,
Li Jiongzhao,
Kong Xueqian,
Peng Xiaogang
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201909576
Subject(s) - facet (psychology) , materials science , surface (topology) , nanotechnology , chemical engineering , chemical physics , chemistry , mathematics , geometry , psychology , engineering , social psychology , personality , big five personality traits
Facet‐dependent on‐surface reactions are systematically studied on zinc‐blende CdSe nanoplatelets with atomically‐flat {001} basal facets and small yet non‐polar side facets. The on‐surface half‐reactions between the surface Se sites and Cd carboxylates in the solution are qualitatively equivalent to those on the spheroidal counterparts. Conversely, the on‐surface half‐reactions between the surface Cd sites and the activated Se precursors in solution show a strong facet‐dependence, which includes three distinguishable stages. In the first stage, the Se precursors adsorb onto the small and non‐polar side facets of the nanoplatelets. The second stage is initiated by the adsorbed Se precursors at the side‐basal plane edges and proceeds from the edges to the center of the basal planes in quasi‐zeroth‐order kinetics. In the third stage, the nanoplatelets are dismantled, which includes the creation of a hole in the middle and a build‐up of thick edges.