Preparation of silver nanoparticles in solution from a silver salt by laser irradiation

Abid, Jean‐Pierre; Wark, Alastair W.; Brevet, Pierre‐François; Girault, Hubert H.

doi:10.1039/b200272h

Cited by 302 publications

(163 citation statements)

References 15 publications

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“…Metal particles can be generated with light [24][25][26] and by the electroless deposition via galvanic displacement [27]. Additionally, the fractal silver surfaces result in a partial elimination of self-quenching.…”

Section: Discussionmentioning

confidence: 99%

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Geddes

Parfenov

Roll

et al. 2003

Journal of Fluorescence

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Substantial increases in fluorescence emission from fluorophore-protein-coated fractal-like silver structures have been observed. We review two methods for silver fractal structure preparation, which have been employed and studied. The first, a roughened silver electrode, typically yielded a 100-fold increase in fluorophore emission, and the second, silver fractal-like structures grown on glass between two silver electrodes, produced a ≈500-fold increase. In addition, significant increases in probe photostability were observed for probes coated on the silver fractal like structures. These results further serve to compliment our recent work on the effects of nobel metal particles with fluorophores, a relatively new phenomenon in fluorescence we have termed both "metal-enhanced fluorescence" [1] and "radiative decay engineering" [2,3]. These results are explained by the metallic surfaces modifying the radiative decay rate (Γ) of the fluorescent labels. We believe that this new silver-surface preparation, which results in ultrabright and photostable fluorophores, offers a new generic technology platform for increased fluorescence signal levels, with widespread potential applications to the analytical sciences, imaging, and medical diagnostics.

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Section: Discussionmentioning

confidence: 99%

Untitled

Geddes

Parfenov

Roll

et al. 2003

Journal of Fluorescence

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“…Email: dhansdd@yahoo.co.in sonochemical deposition [4,5], photochemical reduction [6], laser irradiation technique [7] and sputter deposition. Recent studies of microorganisms in the synthesis of nanoparticles are a new and exciting area of research with considerable potential for development [8].…”

Section: Introductionmentioning

confidence: 99%

Extracellular biosynthesis, characterisation and in-vitro antibacterial potential of silver nanoparticles using Agaricus bisporus

Dhanasekaran

Latha

Saha

et al. 2012

Journal of Experimental Nanoscience

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Microbial silver nanoparticles have been known to have bactericidal effects but the antimicrobial mechanism has not been clearly revealed. The use of microorganisms in the synthesis of nanoparticles emerges as an ecofriendly and exciting approach. Here we report on the extracellular synthesis method for the preparation of silver nanoparticles in water using the extract of Agaricus bisporus, a naturally occurring edible mushroom, as reducing and protecting agents. The silver nanoparticles were characterised by ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy (FTIR) and X-Ray diffraction (XRD) analysis. The synthesised silver nanoparticles showed antibacterial activity against the multi-drug resistant Gram positive and Gram negative bacterial pathogens.

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“…This process is rather efficient for visible incident energies but still active at energies of infra-red photons. 19 Furthermore, HRS measurements on a pNA solution clearly exhibited the single HRS band without any background signal confirming the origin of the photoluminescence from the nanoparticles sample cell and not from other experimental sources.…”

Section: Photoluminescencementioning

confidence: 61%

Hyper-Rayleigh scattering of gold nanorods and their relationship with linear assemblies of gold nanospheres

et al. 2004

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The surface plasmon enhanced hyper-Rayleigh scattering light collected from an aqueous solution of gold nanorods is reported. A non negligible part of the signal is attributed to a photoluminescence background attributed to the electron-hole recombination following multiphoton excitation of d-valence band electrons into the sp-conduction band. This radiative relaxation process is likely favored by the presence of the organic species adsorbed at the surface of the nanorods. The absolute value for the hyperpolarisability of nanorods is also compared by the external reference method to that of para-nitroaniline and found to be rather large although an absolute value cannot be given because the exact number density of the gold nanorods is unaccessible. This value is however compared with values reported for linear assemblies of gold spherical nanoparticles and further support the simple model of gold metal ellipsoids to describe the hyper-Rayleigh light intensities. The polarisation analysis of the hyper-Rayleigh scattering light is also determined for gold nanorods and compared to the expected one for gold nanospheres. For the latter spheres, the weakness of the signal intensities precludes a definite comparison with the model. On the opposite, for the nanorods, the polarisation dependence of the hyper-Rayleigh scattered light clearly deviates from the one expected for nanospheres.

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Preparation of silver nanoparticles in solution from a silver salt by laser irradiation

Abstract: A new method is proposed for the fabrication of a well-defined size and shape distribution of silver nanoparticles in solution; the method employs direct laser irradiation of an aqueous solution containing a silver salt and a surfactant in the absence of reducing agents.

Cited by 302 publications

References 15 publications

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Extracellular biosynthesis, characterisation and in-vitro antibacterial potential of silver nanoparticles using Agaricus bisporus

Hyper-Rayleigh scattering of gold nanorods and their relationship with linear assemblies of gold nanospheres

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