Photofragmentation of colloidal solutions of gold nanoparticles under femtosecond laser pulses in IR and visible ranges

Данилов, П. А.; Zayarnyĭ, D A; Ионин, А. А.; Kudryashov, S. I.; Lednev, V. N.; Makarov, Sergey; Першин, С. М.; Rudenko, A. A.; Сараева, И. Н.; Yurovskikh, V. I.

doi:10.1070/qe2015v045n05abeh015760

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…By contrast, the full width at half maximum (FWHM) values exhibit opposite dynamics (figure 3(b)). It is known that the decrease of the NP radius leads to a corresponding decrease of the intensity and broadening of the LPR spectral peaks, which is explained by the enhanced surface scattering of electrons in smaller NPs [17,[21][22][23]. The position of the LPR peak remains almost unchanged, making it impossible to analyze the NP size distribution and concentration by means of this characteristic, although such estimates were found to be quite precise [19].…”

Section: Resultsmentioning

confidence: 99%

“…The ablative fabrication of Au NPs in water colloidal solutions was carried out using an experimental workstation for the laser generation of NP sols [17]. This was equipped with an ytterbium-doped fiber laser (central wavelength λ = 1030 nm, FWHM pulse width τ = 300 fs, repetition rate f = 500 kHz, maximum energy E max up to 10 µJ in the TEM 00 mode) ( figure 1).…”

Section: Methodsmentioning

confidence: 99%

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Non-monotonic variation of Au nanoparticle yield during femtosecond/picosecond laser ablation in water

et al. 2017

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Ablative multi-shot preparation of gold nanoparticle hydrosols was carried out by rasterscanning a gold plate in deionized water using focused 1030 nm laser pulses of variable pulse width (0.3-6 ps). The relative nanoparticle yield, correlated with the extinction coefficient of colloidal solutions, exhibited an extraordinary non-monotonic variation versus the laser pulse width, which is explained by the electronic dynamics in gold in the lower limit, and either film water boiling or sub-critical peak laser powers in the upper limit.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Non-monotonic variation of Au nanoparticle yield during femtosecond/picosecond laser ablation in water

et al. 2017

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“…No multiphoton fragmentation was assumed at 1064 nm . Intuitively, LPC in the UV–vis range is more efficient than that in the IR range because of the higher excitation at the interband or the plasmon resonance of the NPs. , In summary, decreasing the laser wavelength results in higher photon energies and, thus, a higher probability for multiphotoionization and more efficient excitation, which may be useful for LFL. During LAL, decreasing the wavelength leads to smaller particle sizes because of simultaneous LFL.…”

Section: Material Process Liquid and Laser Parametersmentioning

confidence: 99%

Laser Synthesis and Processing of Colloids: Fundamentals and Applications

2017

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Driven by functionality and purity demand for applications of inorganic nanoparticle colloids in optics, biology, and energy, their surface chemistry has become a topic of intensive research interest. Consequently, ligand-free colloids are ideal reference materials for evaluating the effects of surface adsorbates from the initial state for application-oriented nanointegration purposes. After two decades of development, laser synthesis and processing of colloids (LSPC) has emerged as a convenient and scalable technique for the synthesis of ligand-free nanomaterials in sealed environments. In addition to the high-purity surface of LSPC-generated nanoparticles, other strengths of LSPC include its high throughput, convenience for preparing alloys or series of doped nanomaterials, and its continuous operation mode, suitable for downstream processing. Unscreened surface charge of LSPC-synthesized colloids is the key to achieving colloidal stability and high affinity to biomolecules as well as support materials, thereby enabling the fabrication of bioconjugates and heterogeneous catalysts. Accurate size control of LSPC-synthesized materials ranging from quantum dots to submicrometer spheres and recent upscaling advancement toward the multiple-gram scale are helpful for extending the applicability of LSPC-synthesized nanomaterials to various fields. By discussing key reports on both the fundamentals and the applications related to laser ablation, fragmentation, and melting in liquids, this Article presents a timely and critical review of this emerging topic.

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“…Similarly, even though the femtosecond laser ablation of bulk gold (Au) targets in liquids is widely used for the fabrication of nanoparticle sols [23,24], its fundamental characteristics (e.g. single-shot ablation thresholds) and the corresponding ablation mechanisms have not yet been explored.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale surface boiling in sub-threshold damage and above-threshold spallation of bulk aluminum and gold by single femtosecond laser pulses

Ионин¹,

Kudryashov²,

Makarov³

et al. 2015

Laser Phys. Lett.

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The sub and near-threshold topographic signatures of the spallation of nanometer-thick melt layers during single-shot femtosecond laser ablation of bulk aluminum and gold were experimentally observed for the first time, using scanning electron microscopy with high spatial resolution. The novel ablative nanofeatures—sub-threshold boiling nanopits, the partially detached ultrathin solidified melt layer, and the lamellar surface structure under the layer along the spallative crater border, as well as the foam-like nanostructure of the crater bottom—indicate the boiling origin of the spallation threshold, rather than the thermomechanical rupture of the molten surface layer in a propagating unloading wave. These ablative surface nanofeatures were also revealed in trenches of single-shot, near-wavelength normal interference ripples on the aluminum surface, indicating their spallative nature and being promising for biosensing applications.

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Photofragmentation of colloidal solutions of gold nanoparticles under femtosecond laser pulses in IR and visible ranges

Cited by 5 publications

References 15 publications

Non-monotonic variation of Au nanoparticle yield during femtosecond/picosecond laser ablation in water

Non-monotonic variation of Au nanoparticle yield during femtosecond/picosecond laser ablation in water

Laser Synthesis and Processing of Colloids: Fundamentals and Applications

Nanoscale surface boiling in sub-threshold damage and above-threshold spallation of bulk aluminum and gold by single femtosecond laser pulses

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