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Facile Synthesis of Rhodium Icosahedra with Controlled Sizes up to 12 nm
Author(s) -
Choi SangIl,
Lee Sujin R.,
Ma Cheng,
Oliy Bogdan,
Luo Ming,
Chi Miaofang,
Xia Younan
Publication year - 2016
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201500122
Subject(s) - rhodium , stacking , kinetics , nanocrystal , octahedron , materials science , reducing agent , crystal (programming language) , crystallography , single crystal , chemistry , chemical engineering , catalysis , crystal structure , nanotechnology , organic chemistry , physics , engineering , quantum mechanics , computer science , programming language
We report a facile synthesis of Rh icosahedra with average sizes up to 12.0±0.8 nm through the use of a relatively slow reduction process. By using Rh(acac) 3 as a precursor to Rh and poly(vinyl pyrrolidone) (PVP) as a reducing agent, the reduction kinetics can be manipulated such to promote the formation of twin defects in the Rh nanocrystals. When Rh(acac) 3 is replaced by other precursors containing mono‐dentate ligands, single‐crystal Rh nanocrystals are obtained due to the acceleration of reduction rate. By increasing the molecular weight of PVP from 10 000 to 1 300 000, the resulting Rh nanocrystals are transformed from single‐crystal octahedra to multiply twinned icosahedra and stacking‐fault‐lined plates. These results suggest that the successful preparation of Rh icosahedra could be facilitated by varying the binding strength of a ligand to Rh in the precursor and/or the molecular weight of PVP to optimize the reduction kinetics.