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Synthesis of Palladium Nanoscale Octahedra through a One‐Pot, Dual‐Reductant Route and Kinetic Analysis
Author(s) -
FigueroaCosme Legna,
Gilroy Kyle D.,
Yang TungHan,
Vara Madeline,
Park Jinho,
Bao Shixiong,
da Silva Anderson G. M.,
Xia Younan
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201705720
Subject(s) - nucleation , supersaturation , nanocrystal , palladium , homogeneous , colloid , nanoscopic scale , chemical physics , chemical engineering , kinetic energy , metal , materials science , kinetics , octahedron , catalysis , nanotechnology , crystallization , chemistry , crystallography , thermodynamics , metallurgy , crystal structure , organic chemistry , physics , quantum mechanics , engineering
Shape‐controlled synthesis of colloidal metal nanocrystals has traditionally relied on the use of an approach that involves the reduction of a metal precursor by a single reductant. Once the concentration of atoms surpasses supersaturation, they will undergo homogeneous nucleation to generate nuclei and then seeds, followed by further growth into nanocrystals. In general, it is a grand challenge to optimize such an approach because the kinetic requirement for nucleation tends to be drastically different from what is needed to guide the growth process. In this work, we overcome this difficulty by switching to a dual‐reductant approach, in which both strong and weak reductants are added into the same reaction solution. By controlling their amounts to program the reduction kinetics, the strong reductant only regulates the homogeneous nucleation process to generate the desired seeds, and once consumed, the weak reductant takes over to control the growth pattern and thereby the shape of the resulting nanocrystals.