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Ultra-pure, water-dispersed Au nanoparticles produced by femtosecond laser ablation and fragmentation.

Kubiliūtė R, Maximova KA, Lajevardipour A, Yong J, Hartley JS, Mohsin AS, Blandin P, Chon JW, Sentis M, Stoddart PR, Kabashin A, Rotomskis R, Clayton AH, Juodkazis S - Int J Nanomedicine (2013)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Centre for Micro-Photonics and Industrial Research Institute Swinburne, Faculty of Engineering and Industrial Sciences Swinburne University of Technology, Hawthorn, VIC, Australia.

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.

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(A) Comparison of surface-enhanced Raman spectroscopy spectra from gold (Au)-nanoparticles (solution No 1) treated with mercaptosilane cross linker and with Rh6G. (B) The same sample showing peaks for 4.3 μM Rh6G after subtracting the mercaptosilane background.Abbreviations: 3MPTS, (3-mercaptopropyl) trimethoxysilane; Rh6G, rhodamine 6G.
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f9-ijn-8-2601: (A) Comparison of surface-enhanced Raman spectroscopy spectra from gold (Au)-nanoparticles (solution No 1) treated with mercaptosilane cross linker and with Rh6G. (B) The same sample showing peaks for 4.3 μM Rh6G after subtracting the mercaptosilane background.Abbreviations: 3MPTS, (3-mercaptopropyl) trimethoxysilane; Rh6G, rhodamine 6G.

Mentions: The SERS spectrum of diluted Rh6G solution (4.3 μM) was measured using Au nanoparticles (solution Number 1 after ultrasonic resuspension) attached to a silicon wafer surface by a mercaptosilane cross linker. The immobilized Au nanoparticles were expected to act as an SERS substrate.52 When the nanoparticles were exposed to the Rh6G solution, the SERS spectrum clearly showed the Rh6G signature peaks with a small shift from those in solution53 at: 611 (614 in solution), 773 (774), 1124 (1129), 1185 (1183), 1312 (1310), 1364 (1363), 1506 (1509), and 1645 (1650) as shown in Figure 9A. Change of spectral positions of the peaks by ±(7–10)cm−1 corresponds to 1.24 meV or 0.12 kJ/mol and is expected for adsorbed molecules. The differential spectrum (Figure 9B) clearly reveals Rh6G and demonstrates the feasibility of using laser-ablated Au nanoparticles for SERS sensing.


Ultra-pure, water-dispersed Au nanoparticles produced by femtosecond laser ablation and fragmentation.

Kubiliūtė R, Maximova KA, Lajevardipour A, Yong J, Hartley JS, Mohsin AS, Blandin P, Chon JW, Sentis M, Stoddart PR, Kabashin A, Rotomskis R, Clayton AH, Juodkazis S - Int J Nanomedicine (2013)

(A) Comparison of surface-enhanced Raman spectroscopy spectra from gold (Au)-nanoparticles (solution No 1) treated with mercaptosilane cross linker and with Rh6G. (B) The same sample showing peaks for 4.3 μM Rh6G after subtracting the mercaptosilane background.Abbreviations: 3MPTS, (3-mercaptopropyl) trimethoxysilane; Rh6G, rhodamine 6G.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3722033&req=5

f9-ijn-8-2601: (A) Comparison of surface-enhanced Raman spectroscopy spectra from gold (Au)-nanoparticles (solution No 1) treated with mercaptosilane cross linker and with Rh6G. (B) The same sample showing peaks for 4.3 μM Rh6G after subtracting the mercaptosilane background.Abbreviations: 3MPTS, (3-mercaptopropyl) trimethoxysilane; Rh6G, rhodamine 6G.
Mentions: The SERS spectrum of diluted Rh6G solution (4.3 μM) was measured using Au nanoparticles (solution Number 1 after ultrasonic resuspension) attached to a silicon wafer surface by a mercaptosilane cross linker. The immobilized Au nanoparticles were expected to act as an SERS substrate.52 When the nanoparticles were exposed to the Rh6G solution, the SERS spectrum clearly showed the Rh6G signature peaks with a small shift from those in solution53 at: 611 (614 in solution), 773 (774), 1124 (1129), 1185 (1183), 1312 (1310), 1364 (1363), 1506 (1509), and 1645 (1650) as shown in Figure 9A. Change of spectral positions of the peaks by ±(7–10)cm−1 corresponds to 1.24 meV or 0.12 kJ/mol and is expected for adsorbed molecules. The differential spectrum (Figure 9B) clearly reveals Rh6G and demonstrates the feasibility of using laser-ablated Au nanoparticles for SERS sensing.

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Centre for Micro-Photonics and Industrial Research Institute Swinburne, Faculty of Engineering and Industrial Sciences Swinburne University of Technology, Hawthorn, VIC, Australia.

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.

Show MeSH
Related in: MedlinePlus