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Shape Transformation of Bimetallic Au–Pd Core–Shell Nanocubes to Multilayered Au–Pd–Au Core–Shell Hexagonal Platelets

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Abstract

Transformation of metallic or bimetallic (BM) nanoparticles (NPs) from one shape to another desired shape is of importance to nanoscience and nanotechnology, where new morphologies of NPs lead to enhancement of their exploitable properties. In this report, we present the shape transformation of Au octahedral NPs to Au–Pd core–shell nanocubes, followed by their transformation to nanostars and finally to multilayered Au–Pd–Au core–shell hexagonal platelets in the presence of T30 DNA. The weaker binding affinity of T30 DNA directs the growth to favor the formation of lower energy {111} facets, changing the morphology from nanocubes to nanostar. The nanostars, exhibiting unusual intermediate morphologies, are comprised two sets of shell layers and have Au core, Pd intermediate shell, and Au outer shell. Similarly, the hexagonal platelets, which also have Au core and inner Pd shell, are encased in an external gold shell. The formation of multilayered Au–Pd–Au core–shell hexagonal platelets from Au–Pd core–shell nanocubes via the multilayered nanostars is monitored using scanning/transmission electron microscopy analysis.

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Acknowledgments

T.P. acknowledges support from the Department of Energy Office of Science Early Career Research Award, Biomolecular Materials Program. This work was supported by the U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering. The research was performed at the Ames Laboratory, which is operated for the U.S. Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358. The authors are very grateful to the laboratory of Prof. Yi Lu from University of Illinois, Urbana, for providing the T30 DNA molecules used for this synthesis and for useful discussions.

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  1. Emergent Atomic and Magnetic Structures, Division of Materials Sciences and Engineering, Ames Laboratory, Ames, IA, 50011, USA

    Nabraj Bhattarai & Tanya Prozorov

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  1. Nabraj Bhattarai
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  2. Tanya Prozorov
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Correspondence to Nabraj Bhattarai.

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This article is an invited paper selected from presentations at the 2014 Microscopy & Microanalysis Conference, held August 3–7, 2014, in Hartford, Connecticut, USA, and has been expanded from the original presentation.

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Bhattarai, N., Prozorov, T. Shape Transformation of Bimetallic Au–Pd Core–Shell Nanocubes to Multilayered Au–Pd–Au Core–Shell Hexagonal Platelets. Metallogr. Microstruct. Anal. 4, 481–487 (2015). https://doi.org/10.1007/s13632-015-0246-9

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  • DOI: https://doi.org/10.1007/s13632-015-0246-9

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