Controlled size manipulation of free gold nanoparticles by laser irradiation and their facile bioconjugation

Amendola, Vincenzo; Meneghetti, Moreno

doi:10.1039/b709621f

Cited by 132 publications

(213 citation statements)

References 49 publications

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“…Despite the absence of stabilizers, noble metal nanoparticles produced by laser ablation in liquid (LAL) in various media including deionized and organic solvents are anomalously stable for days and even up to several months. [68][69][70] We also confirmed that AuNPs prepared by LAL in deionized water are stable after one month without any stabilizing agents. The surfactantfree AuNPs so produced are inherently stable mainly because their surfaces are negatively charged.…”

supporting

confidence: 63%

Aggregation of Laser-Generated Gold Nanoparticles Mediated by Formalin

Kim¹,

Song²,

Kim³

et al. 2013

Bulletin of the Korean Chemical Society

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We have investigated the effects of formalin on the assembly of colloidal gold nanoparticles (AuNPs) prepared by laser ablation of a solid gold target in deionized water. Upon addition of formalin, the surface plasmon resonance (SPR) band at 519 nm for pure AuNPs decreases and shifts to red while a new broad SPR band appears at ~700 nm. The red-shift is prominent with increase in the incubation time. The average size of the initial AuNPs is around 12 nm but it increases to 23 nm after addition of formalin. It turns out that formalin acts as a cationic surfactant for AuNPs with negative surface charge in the colloidal solutions. Furthermore, through analysis of the Raman spectrum of formalin and the density functional theory calculations, we confirm that methanediol is the main species in formalin which is in charge of the aggregation of AuNPs.

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supporting

confidence: 63%

Aggregation of Laser-Generated Gold Nanoparticles Mediated by Formalin

Kim¹,

Song²,

Kim³

et al. 2013

Bulletin of the Korean Chemical Society

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“…Their average diameter was determined by fitting the UV-vis solution spectra with the Mie-Gans model, which was shown to be a simple and reliable method. [20][21][22][23] It was found that AuNP have an average diameter of 10 nm, which is small enough to be included in the interstices of opals without perturbing their structure. Polystyrene (PS) opals, both bare and AuNP doped, were grown according to the procedure previously reported.…”

Section: Resultsmentioning

confidence: 99%

“…AuNP were prepared by laser ablation [20][21][22][23] in water solutions of sodium dodecyl sulfate (10 12 AuNP/cm 3 ). Their average diameter was determined by fitting the UV-vis solution spectra with the Mie-Gans model, which was shown to be a simple and reliable method.…”

Section: Resultsmentioning

confidence: 99%

Light Localization Effect on the Optical Properties of Opals Doped with Gold Nanoparticles

et al. 2008

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Polystyrene artificial opals having both different microsphere diameters and gold nanoparticles (AuNP) doping levels have been prepared and their spectroscopic characterization has been performed. Reflectance spectra of doped opals show a red shift of the photonic band gap and a reduction of its width and intensity upon increasing AuNP doping level, but they do not show any direct evidence of AuNP plasmon resonance. Transmittance spectra of the same samples recorded on the same spot area show, instead, a doping level dependent line shape. For the highest doping level a complicated sigmoidal line shape due to the overlap of broad AuNP absorption and photonic crystal stop band is observed. This unusual effect is accounted for by considering the localization of standing electromagnetic waves within both the microspheres and the interstices where the AuNP are embedded.

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“…A 'top-down' approach, laser fragmentation in liquid, has been normally adopted to realize size-reduction and size-distributionnarrowing of colloidal noble metal (gold and silver) nanoparticles, through nanosecond laser vaporization [15][16][17] or picosecond-laserinduced Coulomb explosion 18 of nanoparticles upon laser irradiation. However, the polydispersity after laser treatments usually remains fairly large (s410%).…”

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confidence: 99%

A top–down strategy towards monodisperse colloidal lead sulphide quantum dots

et al. 2013

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Monodisperse colloidal quantum dots with size dispersions o10% are of great importance in realizing functionality manipulation, as well as building advanced devices, and have been normally synthesized via 'bottom-up' colloidal chemistry. Here we report a facile and environmentally friendly 'top-down' strategy towards highly crystalline monodisperse colloidal PbS quantum dots with controllable sizes and narrow dispersions 5.5%oso9.1%, based on laser irradiation of a suspension of polydisperse PbS nanocrystals with larger sizes.The colloidal quantum dots demonstrate size-tunable near-infrared photoluminescence, and self-assemble into well-ordered two-dimensional or three-dimensional superlattices due to the small degree of polydispersity and surface capping of 1-dodecanethiol, not only serving as a surfactant but also a sulphur source. The acquisition of monodisperse colloidal PbS quantum dots is ascribed to both the quantum-confinement effect of quantum dots and the size-selective-vaporization effect of the millisecond pulse laser with monochromaticity and low intensity.

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Controlled size manipulation of free gold nanoparticles by laser irradiation and their facile bioconjugation

Cited by 132 publications

References 49 publications

Aggregation of Laser-Generated Gold Nanoparticles Mediated by Formalin

Aggregation of Laser-Generated Gold Nanoparticles Mediated by Formalin

Light Localization Effect on the Optical Properties of Opals Doped with Gold Nanoparticles

A top–down strategy towards monodisperse colloidal lead sulphide quantum dots

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