Size-Dependent Adhesion Energy Of Shape-Selected Pd And Pt Nanoparticles

Abstract

Thermodynamically stable shape-selected Pt and Pd nanoparticles (NPs) were synthesized via inverse micelle encapsulation and a subsequent thermal treatment in vacuum above 1000 °C. The majority of the Pd NPs imaged via scanning tunneling microscopy (STM) had a truncated octahedron shape with (111) top and interfacial facets, while the Pt NPs were found to adopt a variety of shapes. For NPs of identical shape for both material systems, the NP-support adhesion energy calculated based on STM data was found to be size-dependent, with large NPs (e.g. ∼6 nm) having lower adhesion energies than smaller NPs (e.g. ∼1 nm). This phenomenon was rationalized based on support-induced strain that for larger NPs favors the formation of lattice dislocations at the interface rather than a lattice distortion that may propagate through the smaller NPs. In addition, identically prepared Pt NPs of the same shape were found to display a lower adhesion energy compared to Pd NPs. While in both cases, a transition from a lattice distortion to interface dislocations is expected to occur with increasing NP size, the higher elastic energy in Pt leads to a lower transition size, which in turn lowers the adhesion energy of Pt NPs compared to Pd.

Publication Date

6-14-2016

Publication Title

Nanoscale

Volume

8

Issue

22

Number of Pages

11635-11641

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1039/c6nr02166b

Socpus ID

84973531089 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84973531089

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