A Simple Route to the Synthesis of Pt Nanobars and the Mechanistic Understanding of Symmetry Reduction

Ruhui Chen; Quynh N. Nguyen; Ming Zhao; Zitao Chen; Miaofang Chi; Younan Xia

doi:10.1002/chem.202004104

A Simple Route to the Synthesis of Pt Nanobars and the Mechanistic Understanding of Symmetry Reduction

Ruhui Chen, Quynh N. Nguyen, Ming Zhao, Zitao Chen, Miaofang Chi, Younan Xia

electron Microscopy and Microanalysis

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

5 Scopus citations

Abstract

Noble-metal nanocrystals with anisotropic shapes have received increasing interest owing to their unique properties. Here, a facile route to the preparation of Pt nanobars with aspect ratios tunable up to 2.1 was reported by simply reducing a Pt^IV precursor in N,N-dimethylformamide (DMF) at 160 °C in the presence of poly(vinyl pyrrolidone) (PVP). In addition to its commonly observed roles as a solvent and a reductant, DMF could also decompose to generate CO, a capping agent capable of selectively passivating Pt{100} facets to promote the formation of nanobars. The size and aspect ratio of the nanobars could be tuned by varying the amount of Pt^IV precursor involved in the synthesis, as well as the concentration of PVP because of its dual roles as a stabilizer and a co-reductant. Our mechanistic study indicated that the anisotropic growth resulted from both particle coalescence and localized oxidative etching followed by preferential growth.

Original language	English
Pages (from-to)	2760-2766
Number of pages	7
Journal	Chemistry - A European Journal
Volume	27
Issue number	8
DOIs	https://doi.org/10.1002/chem.202004104
State	Published - Feb 5 2021

Funding

This work was supported in part by a research grant from the NSF (CHE‐1804970) and start‐up funds from the Georgia Institute of Technology. Q.N. acknowledges summer support from the NSF Research Experiences for Undergraduates (REU, CHE‐1560335). TEM imaging was performed at the Georgia Tech Institute for Electronics and Nanotechnology, a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the National Science Foundation (ECCS‐2025462). HRTEM images were acquired at the Oak Ridge National Laboratory's Center for Nanophase Materials Sciences sponsored by the U. S. Department of Energy Office of Science User Facility.

Funders	Funder number
U. S. Department of Energy Office of Science
National Science Foundation	ECCS‐2025462, CHE‐1804970, 1804970
Georgia Institute of Technology	CHE‐1560335

Keywords

CO-mediated synthesis
Pt nanobars
localized oxidative etching
particle coalescence
symmetry breaking

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10.1002/chem.202004104

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abstract = "Noble-metal nanocrystals with anisotropic shapes have received increasing interest owing to their unique properties. Here, a facile route to the preparation of Pt nanobars with aspect ratios tunable up to 2.1 was reported by simply reducing a PtIV precursor in N,N-dimethylformamide (DMF) at 160 °C in the presence of poly(vinyl pyrrolidone) (PVP). In addition to its commonly observed roles as a solvent and a reductant, DMF could also decompose to generate CO, a capping agent capable of selectively passivating Pt{100} facets to promote the formation of nanobars. The size and aspect ratio of the nanobars could be tuned by varying the amount of PtIV precursor involved in the synthesis, as well as the concentration of PVP because of its dual roles as a stabilizer and a co-reductant. Our mechanistic study indicated that the anisotropic growth resulted from both particle coalescence and localized oxidative etching followed by preferential growth.",

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AU - Zhao, Ming

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AU - Chi, Miaofang

AU - Xia, Younan

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A Simple Route to the Synthesis of Pt Nanobars and the Mechanistic Understanding of Symmetry Reduction

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