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Ahmadi M, Behafarid F, Cuenya BR. Size-dependent adhesion energy of shape-selected Pd and Pt nanoparticles. Nanoscale. 2016;8(22):11635-41doi: 10.1039/c6nr02166b.
Ahmadi, M., Behafarid, F., & Cuenya, B. R. (2016). Size-dependent adhesion energy of shape-selected Pd and Pt nanoparticles. Nanoscale, 8(22), 11635-41. https://doi.org/10.1039/c6nr02166b
Ahmadi, M, et al. "Size-dependent adhesion energy of shape-selected Pd and Pt nanoparticles." Nanoscale vol. 8,22 (2016): 11635-41. doi: https://doi.org/10.1039/c6nr02166b
Ahmadi M, Behafarid F, Cuenya BR. Size-dependent adhesion energy of shape-selected Pd and Pt nanoparticles. Nanoscale. 2016 Jun 02;8(22):11635-41. doi: 10.1039/c6nr02166b. PMID: 27216883.
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Nanoscale. 2016 Jun 02;8(22):11635-41. doi: 10.1039/c6nr02166b.

Size-dependent adhesion energy of shape-selected Pd and Pt nanoparticles.

Nanoscale

M Ahmadi, F Behafarid, B Roldan Cuenya

Affiliations

  1. Department of Physics, University of Central Florida, Orlando, FL 32816, USA.
  2. Department of Physics, Ruhr-University Bochum, 44780 Bochum, Germany. [email protected].

PMID: 27216883 DOI: 10.1039/c6nr02166b

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.

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