Fluorescence of Colloidal Gold Nanoparticles is Controlled by the Surface Adsorbate

Goldys, Ewa M.; Sobhan, M. Abdus

doi:10.1002/adfm.201102057

Cited by 54 publications

(46 citation statements)

References 30 publications

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“…17,18 Others, however, have estimated a substantial activation energy for thermal decomposition of the oxide. [22][23][24][25] We recently showed that thin films of gold oxide can be used as passivation layers to allow selective reactivity on a particular gold electrode in the presence of another. 19 Measurements of surface resistance on thicker films (>40 Å ) gave a lower activation energy for the decomposition of Au 2 O 3 (57 kJ/mol) and a half-life at 22 C of 22 h. 20 This difference may reflect nonlinearity in the relationship between surface resistance and composition or reduction of the film by primary and secondary electrons generated by exposure to x rays during analysis by x-ray photoelectron spectroscopy in the latter study.…”

Section: Introductionmentioning

confidence: 99%

Relative lability of gold-oxide thin films in contact with air, solvents, or electrolyte solutions

Cook

Ferguson

2013

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Excess Si and passivating N and F atoms near the pyrolytic-gas-passivated ultrathin silicon oxide film/Si(100) interface Influence of ion-beam energy and substrate temperature on the synthesis of carbon nitride thin films by nitrogenion-assisted pulsed laser depositionThe lability of gold-oxide thin films in contact with air, pure solvents, or electrolyte solutions was investigated by monitoring film thicknesses using spectroscopic ellipsometry. Surface compositions were monitored using low-energy ion scattering. The oxide was inert in air over 24 h, but decomposed partially in tetrahydrofuran (THF) and water, and completely in ethanol, within the same period. The film thicknesses decreased significantly in THF solutions of Bu 4 NPF 6 and Bu 4 NBF 4 , but were more inert in solutions of Bu 4 NClO 4 and LiClO 4 in the same solvent, making the latter more suitable choices as supporting electrolytes in electrochemical studies.

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Section: Introductionmentioning

confidence: 99%

Relative lability of gold-oxide thin films in contact with air, solvents, or electrolyte solutions

Cook

Ferguson

2013

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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“…The benefit of two-photon excitation is an improvement of the spatial resolution over what can typically be achieved by confocal fluorescence imaging. Proposed mechanisms for luminescence from Au or Ag nanostructures include fluorescence by interband transitions (7,(11)(12)(13)(14)(15)(16), intraband transitions (17), and radiative decay of surface plasmons (18)(19)(20)(21).…”

mentioning

confidence: 99%

Resonant secondary light emission from plasmonic Au nanostructures at high electron temperatures created by pulsed-laser excitation

Huang¹,

Wang

Murphy³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

136

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Plasmonic nanostructures are of great current interest as chemical sensors, in vivo imaging agents, and for photothermal therapeutics. We study continuous-wave (cw) and pulsed-laser excitation of aqueous suspensions of Au nanorods as a model system for secondary light emission from plasmonic nanostructures. Resonant secondary emission contributes significantly to the background commonly observed in surface-enhanced Raman scattering and to the light emission generated by pulsed-laser excitation of metallic nanostructures that is often attributed to two-photon luminescence. Spectra collected using cw laser excitation at 488 nm show an enhancement of the broad spectrum of emission at the electromagnetic plasmon resonance of the nanorods. The intensity of anti-Stokes emission collected using cw laser excitation at 785 nm is described by a 300 K thermal distribution of excitations. Excitation by subpicosecond laser pulses at 785 nm broadens and increases the intensity of the anti-Stokes emission in a manner that is consistent with electronic Raman scattering by a high-temperature distribution of electronic excitations predicted by a two-temperature model. Broadening of the pulse duration using an etalon reduces the intensity of anti-Stokes emission in quantitative agreement with the model. Experiments using a pair of subpicosecond optical pulses separated by a variable delay show that the timescale of resonant secondary emission is comparable to the timescale for equilibration of electrons and phonons.gold nanorods | electron-hole pairs | surface-enhanced Raman scattering background

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“…P2 is split or oscillate in methanol, ethanol, DIW and n-hexane in three, four, five and seven, respectively. The number of split peaks is different in these solvents, which may be understood through their different charge-transfer nature, electronegativity, chain length and coverage of molecules, and hence surface charge density or interface dipole 40 .…”

Section: Influence Of Refractive Index Of Solvent On Sprmentioning

confidence: 99%

Influence of surfactant, particle size and dispersion medium on surface plasmon resonance of silver nanoparticles

Sharma¹,

Verma²,

Okram³

2020

J. Phys.: Condens. Matter

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Clear influence of particle size, surfactants and dispersion medium on surface plasmon resonance (SPR) features of Ag nanoparticles (NPs), synthesized in thermal decomposition method, in the broad range of ultraviolet (UV) radiation, critical for many potential applications such as a photocatalyst, UV-sensor and detector, has been demonstrated here. It involves adsorbate coverage, interparticle distance or agglomeration, surface charge density and solvent refractive index (μ). NP agglomeration and surface charge density in solvents of varying μ have been studied systematically through zeta-potential (ζ) and hydrodynamic diameter (HD) using dynamic light scattering (DLS). The main SPR feature found at 316 nm in 31.5 nm NPs shifts to 320 nm in 15.1 nm NPs. The peak at 320 nm in air shifts to 259, 261 and 277 nm in polar solvent methanol, deionized water and ethanol, respectively and to 255, 275 and 282 nm in non-polar solvent n-hexane, benzene and toluene, respectively. In general, the decrease in particle size and increase in µ of solvents show red-shift. Curiously, a number of peaks up to seven in these solvents that are attributed to charge-transfer mechanism and change in inter-particle interaction of the NPs turning from a single peak of SPR in air has been observed for the first time. A model for re-adjustment of Fermi level (EF) of Ag NP and the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) to explain them has also been used. Moreover, the Drude model for shift in the position of SPR in these NPs is only applicable in non-polar solvents, not in polar solvents. Such novel features will be potential candidates for various applications.

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Fluorescence of Colloidal Gold Nanoparticles is Controlled by the Surface Adsorbate

Cited by 54 publications

References 30 publications

Relative lability of gold-oxide thin films in contact with air, solvents, or electrolyte solutions

Relative lability of gold-oxide thin films in contact with air, solvents, or electrolyte solutions

Resonant secondary light emission from plasmonic Au nanostructures at high electron temperatures created by pulsed-laser excitation

Influence of surfactant, particle size and dispersion medium on surface plasmon resonance of silver nanoparticles

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