Rhodium Decahedral Nanocrystals: Facile Synthesis, Mechanistic Insights, and Experimental Controls

Sujin R. Lee; Madeline Vara; Zachary D. Hood; Ming Zhao; Kyle D. Gilroy; Miaofang Chi; Younan Xia

doi:10.1002/cnma.201700327

Rhodium Decahedral Nanocrystals: Facile Synthesis, Mechanistic Insights, and Experimental Controls

Sujin R. Lee, Madeline Vara, Zachary D. Hood, Ming Zhao, Kyle D. Gilroy, Miaofang Chi, Younan Xia

electron Microscopy and Microanalysis

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

Decahedral nanocrystals have received great attention owing to their unique symmetry and strain-energy distribution. In contrast to other noble metals, it has been difficult to synthesize decahedral Rh nanocrystals. We report a robust, one-pot method based on polyol reduction for the facile synthesis of Rh decahedral nanocrystals in high purity, with sub-20 nm sizes. The success of the synthesis relied on our ability to manipulate reduction kinetics by systematically tuning experimental parameters. We found that the yield of Rh decahedral nanocrystals could be maximized by optimizing: i) the concentration of Rh(acac)₃ (metal precursor); ii) the molecular weight and amount of poly(vinyl pyrrolidone) (colloidal stabilizer/capping agent); and iii) the chain length of the polyol (solvent/reducing agent), with tetraethylene glycol being the best. We believe the mechanisms elucidated herein can be extended to other syntheses to produce metal nanocrystals with multiply twinned structures.

Original language	English
Pages (from-to)	66-70
Number of pages	5
Journal	ChemNanoMat
Volume	4
Issue number	1
DOIs	https://doi.org/10.1002/cnma.201700327
State	Published - Jan 2018

Funding

This work was supported in part by a grant from the NSF (DMR 1506018) and start-up funds from Georgia Tech. Microscopy work was performed at the Georgia Tech's Institute for Electronics and Nanotechnology (IEN), a member of the National Nanotechnology Coordinated Infrastructure, which is supported by the National Science Foundation (Grant ECCS-1542174). A portion of the microscopy research was also conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. Z.D.H. gratefully acknowledges the support of Graduate Research Fellowship from the NSF under Grant No. DGE-1148903 and the Georgia Tech-ORNL Fellowship. This work was supported in part by a grant from the NSF (DMR 1506018) and start-up funds from Georgia Tech. Microscopy work was performed at the Georgia Tech’s Institute for Electronics and Nanotechnology (IEN), a member of the National Nanotechnology Coordinated Infrastructure, which is supported by the National Science Foundation (Grant ECCS-1542174). A portion of the microscopy research was also conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. Z.D.H. gratefully acknowledges the support of Graduate Research Fellowship from the NSF under Grant No. DGE-1148903 and the Georgia Tech-ORNL Fellowship.

Funders	Funder number
Georgia Tech-ORNL
National Science Foundation	DMR 1506018, DGE-1148903, ECCS-1542174
Office of Science

Keywords

decahedra
kinetics
nanocrystals
rhodium
twin defects

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10.1002/cnma.201700327

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abstract = "Decahedral nanocrystals have received great attention owing to their unique symmetry and strain-energy distribution. In contrast to other noble metals, it has been difficult to synthesize decahedral Rh nanocrystals. We report a robust, one-pot method based on polyol reduction for the facile synthesis of Rh decahedral nanocrystals in high purity, with sub-20 nm sizes. The success of the synthesis relied on our ability to manipulate reduction kinetics by systematically tuning experimental parameters. We found that the yield of Rh decahedral nanocrystals could be maximized by optimizing: i) the concentration of Rh(acac)3 (metal precursor); ii) the molecular weight and amount of poly(vinyl pyrrolidone) (colloidal stabilizer/capping agent); and iii) the chain length of the polyol (solvent/reducing agent), with tetraethylene glycol being the best. We believe the mechanisms elucidated herein can be extended to other syntheses to produce metal nanocrystals with multiply twinned structures.",

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AB - Decahedral nanocrystals have received great attention owing to their unique symmetry and strain-energy distribution. In contrast to other noble metals, it has been difficult to synthesize decahedral Rh nanocrystals. We report a robust, one-pot method based on polyol reduction for the facile synthesis of Rh decahedral nanocrystals in high purity, with sub-20 nm sizes. The success of the synthesis relied on our ability to manipulate reduction kinetics by systematically tuning experimental parameters. We found that the yield of Rh decahedral nanocrystals could be maximized by optimizing: i) the concentration of Rh(acac)3 (metal precursor); ii) the molecular weight and amount of poly(vinyl pyrrolidone) (colloidal stabilizer/capping agent); and iii) the chain length of the polyol (solvent/reducing agent), with tetraethylene glycol being the best. We believe the mechanisms elucidated herein can be extended to other syntheses to produce metal nanocrystals with multiply twinned structures.

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Rhodium Decahedral Nanocrystals: Facile Synthesis, Mechanistic Insights, and Experimental Controls

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