title: Ultra-pure, water-dispersed Au nanoparticles produced by femtosecond laser ablation and fragmentation.
abstract: Aqueous solutions of ultra-pure gold nanoparticles have been prepared by methods of femtosecond laser ablation from a solid target and fragmentation from already formed colloids. Despite the absence of protecting ligands, the solutions could be (1) fairly stable and poly size-dispersed; or (2) very stable and monodispersed, for the two fabrication modalities, respectively. Fluorescence quenching behavior and its intricacies were revealed by fluorescence lifetime imaging microscopy in rhodamine 6G water solution. We show that surface-enhanced Raman scattering of rhodamine 6G on gold nanoparticles can be detected with high fidelity down to micromolar concentrations using the nanoparticles. Application potential of pure gold nanoparticles with polydispersed and nearly monodispersed size distributions are discussed.
authors.affiliation: Centre for Micro-Photonics and Industrial Research Institute Swinburne, Faculty of Engineering and Industrial Sciences Swinburne University of Technology, Hawthorn, VIC, Australia.
authors.forename: Reda
authors.initials: R
authors.lastname: Kubiliūtė
authors.forename: Ksenia A
authors.initials: KA
authors.lastname: Maximova
authors.forename: Alireza
authors.initials: A
authors.lastname: Lajevardipour
authors.forename: Jiawey
authors.initials: J
authors.lastname: Yong
authors.forename: Jennifer S
authors.initials: JS
authors.lastname: Hartley
authors.forename: Abu S M
authors.initials: AS
authors.lastname: Mohsin
authors.forename: Pierre
authors.initials: P
authors.lastname: Blandin
authors.forename: James W M
authors.initials: JW
authors.lastname: Chon
authors.forename: Marc
authors.initials: M
authors.lastname: Sentis
authors.forename: Paul R
authors.initials: PR
authors.lastname: Stoddart
authors.forename: Andrei
authors.initials: A
authors.lastname: Kabashin
authors.forename: Ričardas
authors.initials: R
authors.lastname: Rotomskis
authors.forename: Andrew H A
authors.initials: AH
authors.lastname: Clayton
authors.forename: Saulius
authors.initials: S
authors.lastname: Juodkazis
mesh_terms: D005456:Fluorescent Dyes / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D007834:Lasers; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D010316:Particle Size; D012235:Rhodamines / Q000737:chemistry; D013059:Spectrum Analysis, Raman; D014867:Water
chemical_list: D005456:Fluorescent Dyes; D012235:Rhodamines; C026188:rhodamine 6G; D014867:Water; D006046:Gold
keywords: materials for nanomedicine; methods of nanofabrication and processing; nanotechnologies applications