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• W2078742013 abstract "The ligand shell that coats, protects, and imparts a large number of properties to gold nanoparticles is a 2-D self-assembled monolayer wrapped around a 3-D metallic core. Here we present a study of the molecular packing of ligand shells on gold nanoparticles based on the analysis of scanning tunneling microscopy (STM) images. We discuss methods for optimal nanoparticle sample preparation in relation to STM imaging conditions. We show that the packing of a self-assembled monolayer composed solely of octanethiols on gold nanoparticles depends on the particle's diameter with an average headgroup spacing of 5.4 Å, which is different from that of similar monolayers formed on flat Au(111) surfaces (5.0 Å). In the case of nanoparticles coated with mixtures of ligandsknown to phase separate into randomly shaped and ordered domains on flat surfaceswe find that phase separation leads to the formation of concentric, ribbonlike domains of alternating composition. The spacing of these domains depends on the ligand shell composition. We find that, for a given composition, the spacing increases with diameter in a manner characterized by discontinuous transitions at “critical” particle sizes. We discuss possible interpretations for the observed trends in our data." @default.
• W2078742013 created "2016-06-24" @default.
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• W2078742013 date "2006-08-01" @default.
• W2078742013 modified "2023-10-16" @default.
• W2078742013 title "From Homoligand- to Mixed-Ligand- Monolayer-Protected Metal Nanoparticles: A Scanning Tunneling Microscopy Investigation" @default.
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• W2078742013 doi "https://doi.org/10.1021/ja061545h" @default.
• W2078742013 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16925432" @default.
• W2078742013 hasPublicationYear "2006" @default.
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