Abstract
We report a facile method for the synthesis of Pt–Pd nanocages and Pt nanorings by conformally coating Pd nanoplates with Pt-based shells using polyol- and water-based protocols, respectively, followed by selective removal of the Pd cores. For the polyol-based system, Pd nanoplates were conformally coated with Pt–Pd alloy shells due to the use of a high reaction temperature of 200 °C and a slow injection rate for the Pt precursor. In comparison, Pt shells were formed on Pd nanoplates with a larger thickness on the side face than on the top/bottom face in the water-based system due to the use of a low reaction temperature of 80 °C and the presence of twin boundaries on the side face. As such, the Pd@Pt nanoplates prepared using the polyol- and water-based protocols evolved into Pt–Pd nanocages and Pt nanorings, respectively, when the Pd templates in the cores were selectively removed by wet etching. The wall thickness of the nanocages and the ridge thickness of the nanorings could be reduced down to 1.1 nm and 1.8 nm, respectively, without breaking the hollow structures.
Original language | English |
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Pages (from-to) | 1086-1091 |
Number of pages | 6 |
Journal | ChemNanoMat |
Volume | 2 |
Issue number | 12 |
DOIs | |
State | Published - Dec 2016 |
Funding
This work was supported in part by a grant from the NSF (CHE 1505441) and start-up funds from Georgia Tech. As visiting Ph.D. students, X.W., M.L., and H.H. also received partial support from the China Scholarship Council. Part of the electron microscopy work was performed through a user project supported by the ORNL’s Center for Nanophase Materials Sciences, which is a U.S. DOE Office of Science User Facility (M.C.).
Keywords
- nanocage
- nanoplate
- nanoring
- platinum catalyst
- template-directed synthesis