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Gold Nanoparticle Monolayers from Sequential Interfacial Ligand Exchange and Migration in a Three-Phase System.

Title: Gold Nanoparticle Monolayers from Sequential Interfacial Ligand Exchange and Migration in a Three-Phase System.
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Name(s): Yang, Guang, author
Hallinan, Daniel T, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2016-10-20
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Using a three-phase system, centimeter-scale monolayer gold nanoparticle (Au NP) films have been prepared that have long-range order and hydrophobic ligands. The system contains an interface between an aqueous phase containing Au NPs and an oil phase containing one of various types of amine ligands, and a water/air interface. As the Au NPs diffuse to the water/oil interface, ligand exchange takes place which temporarily traps them at the water/oil interface. The ligand-exchanged particles then spontaneously migrate to the air/water interface, where they self-assemble, forming a monolayer under certain conditions. The spontaneous formation of the NP film at the air/water interface was due to the minimization of the system Helmholtz free energy. However, the extent of surface functionalization was dictated by kinetics. This decouples interfacial ligand exchange from interfacial self-assembly, while maintaining the simplicity of a single system. The interparticle center-to-center distance was dictated by the amine ligand length. The Au NP monolayers exhibit tunable surface plasma resonance and excellent spatial homogeneity, which is useful for surface-enhanced Raman scattering. The "air/water/oil" self-assembly method developed here not only benefits the fundamental understanding of NP ligand conformations, but is also applicable to the manufacture of plasmonic nanoparticle devices with precisely designed optical properties.
Identifier: FSU_pmch_27762394 (IID), 10.1038/srep35339 (DOI), PMC5071885 (PMCID), 27762394 (RID), 27762394 (EID), srep35339 (PII)
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5071885.
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_27762394
Owner Institution: FSU
Is Part Of: Scientific reports.
2045-2322
Issue: vol. 6

Choose the citation style.
Yang, G., & Hallinan, D. T. (2016). Gold Nanoparticle Monolayers from Sequential Interfacial Ligand Exchange and Migration in a Three-Phase System. Scientific Reports. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_27762394