Nature of peptide wrapping onto metal nanoparticle catalysts and driving forces for size control

Hadi Ramezani-Dakhel, Nicholas M. Bedford, Taylor J. Woehl, Marc Knecht, Rajesh R. Naik, Hendrik Heinz

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Colloidal metal nanocrystals find many applications in catalysis, energy conversion devices, and therapeutics. However, the nature of ligand interactions and implications on shape control have remained uncertain at the atomic scale. Large differences in peptide adsorption strength and facet specificity were found on flat palladium surfaces versus surfaces of nanoparticles of 2 to 3 nm size using accurate atomistic simulations with the Interface force field. Folding of longer peptides across many facets explains the formation of near-spherical particles with local surface disorder, in contrast to the possibility of nanostructures of higher symmetry with shorter ligands. The average particle size in TEM correlates inversely with the surface coverage with a given ligand and with the strength of ligand adsorption. The role of specific amino acids and sequence mutations on the nanoparticle size and facet composition is discussed, as well as the origin of local surface disorder that leads to large differences in catalytic reactivity.

Original languageEnglish (US)
Pages (from-to)8401-8409
Number of pages9
JournalNanoscale
Volume9
Issue number24
DOIs
StatePublished - Jun 28 2017

ASJC Scopus subject areas

  • Materials Science(all)

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    Ramezani-Dakhel, H., Bedford, N. M., Woehl, T. J., Knecht, M., Naik, R. R., & Heinz, H. (2017). Nature of peptide wrapping onto metal nanoparticle catalysts and driving forces for size control. Nanoscale, 9(24), 8401-8409. https://doi.org/10.1039/c7nr02813j