Laser Controlled Synthesis of Noble Metal Nanoparticle Arrays for Low Concentration Molecule Recognition

Fazio, Enza; Neri, F.; Ponterio, Rosina Celeste; Trusso, S.; Tommasini, Matteo; Ossi, P.M.

doi:10.3390/mi5041296

Cited by 17 publications

(10 citation statements)

References 23 publications

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“…5d–i , the small and medium particles are seen to form random networks with the medium-sized particles sparsely covering the surface and the small ones more densely distributed across the irradiated region (see Supplementary Note 2 ). The formation of NPs is believed to come from the combination of thermal effects 31 32 33 34 and the redeposition of particles following laser ablation 17 15 . Upon close examination of the SEM images, it appears that the small particles are in reality approximately hemispherical, an observation supported by a cross-section of a coloured silver sample obtained through focused ion beam milling and imaging.…”

Section: Resultsmentioning

confidence: 99%

Laser-induced plasmonic colours on metals

et al. 2017

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Plasmonic resonances in metallic nanoparticles have been used since antiquity to colour glasses. The use of metal nanostructures for surface colourization has attracted considerable interest following recent developments in plasmonics. However, current top-down colourization methods are not ideally suited to large-scale industrial applications. Here we use a bottom-up approach where picosecond laser pulses can produce a full palette of non-iridescent colours on silver, gold, copper and aluminium. We demonstrate the process on silver coins weighing up to 5 kg and bearing large topographic variations (∼1.5 cm). We find that colours are related to a single parameter, the total accumulated fluence, making the process suitable for high-throughput industrial applications. Statistical image analyses of laser-irradiated surfaces reveal various nanoparticle size distributions. Large-scale finite-difference time-domain computations based on these nanoparticle distributions reproduce trends seen in reflectance measurements, and demonstrate the key role of plasmonic resonances in colour formation.

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Section: Resultsmentioning

confidence: 99%

Laser-induced plasmonic colours on metals

et al. 2017

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“…Thus, the formation of decorated NWs can be explained in terms of the NP formation process proposed by Fazio et al in conjunction with the mechanism for the formation of NWs/fibers explained above [35]. In short, the laser pulses locally melt the target and produce an ablation plume where the NPs are formed.…”

Section: Discussionmentioning

confidence: 96%

“…Fazio et al observed the formation of Au and Ag nanoparticles formed by laser ablation in an Ar atmosphere (which matches our experimental situation). The NPs form in the ablation plume and are subsequently deposited in a self-organized manner over solid substrates placed directly in front of the target [35]. The same process of NP formation followed by deposition has been observed in ablated Au and Ag surfaces (among other metals) [36].…”

Section: Discussionmentioning

confidence: 99%

Room temperature single-step synthesis of metal decorated boron-rich nanowires via laser ablation

et al. 2019

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Hybrid nanostructures, such as those with nanoparticles anchored on the surface of nanowires, or decorated nanowires, have a large number of potential and tested applications such as: gas sensing, catalysis, plasmonic waveguides, supercapacitors and more. The downside of these nanostructures is their production. Generally, multi-step synthesis procedures are used, with the nanowires and the nanoparticles typically produced separately and then integrated. The few existent single-step methods are lengthy or necessitate highly dedicated setups. In this paper we report a single-step and rapid (ca. 1 min) laser ablation synthesis method which produces a wide variety of boron-rich decorated nanowires. Furthermore, the method is carried at room temperature. The synthesis process consists on a filamentary jet ejection process driven by pressure gradients generated by the ablation plume on the rims of the irradiation crater. Simultaneously nanoparticles are nucleated and deposited on the filaments thus producing hybrid decorated nanowires. Electronic supplementary material The online version of this article (10.1186/s40580-019-0185-2) contains supplementary material, which is available to authorized users.

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“…The application of the laser ablation (LA) technique covers a great variety of scientific and technological fields: Pulsed Laser Deposition (PLD) [ 1 ], nanoparticles production [ 2 ], Laser Induced Breakdown Spectroscopy (LIBS) for chemical analysis of solid materials [ 3 ], high-precision artwork restoration [ 4 ], investigation of the conditions for inertial confinement fusion [ 5 ]. Despite being so widely used, LA is far from being completely understood.…”

Section: Introductionmentioning

confidence: 99%

Laser Ablation of Aluminum Near the Critical Regime: A Computational Gas-Dynamical Model with Temperature-Dependent Physical Parameters

Terragni

Miotello

2021

Micromachines

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The complexity of the phenomena simultaneously occurring, from the very first instants of high-power laser pulse interaction with the target up to the phase explosion, along with the strong changes in chemical-physical properties of matter, makes modeling laser ablation a hard task, especially near the thermodynamic critical regime. In this work, we report a computational model of an aluminum target irradiated in vacuum by a gaussian-shaped pulse of 20ns duration, with a peak intensity of the order of GW/cm□. This continuum model covers laser energy deposition and temperature evolution in the irradiated target, along with the mass removal mechanism involved, and the vaporized material expansion. Aluminum was considered to be a case study due to the vast literature on the temperature dependence of its thermodynamic, optical, and transport properties that were used to estimate time-dependent values of surface-vapor quantities (vapor pressure, vapor density, vapor and surface temperature) and vapor gas-dynamical quantities (density, velocity, pressure) as it expands into vacuum. Very favorable agreement is reported with experimental data regarding: mass removal and crater depth due to vaporization, generated recoil momentum, and vapor flow velocity expansion.

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Laser Controlled Synthesis of Noble Metal Nanoparticle Arrays for Low Concentration Molecule Recognition

Cited by 17 publications

References 23 publications

Laser-induced plasmonic colours on metals

Laser-induced plasmonic colours on metals

Room temperature single-step synthesis of metal decorated boron-rich nanowires via laser ablation

Laser Ablation of Aluminum Near the Critical Regime: A Computational Gas-Dynamical Model with Temperature-Dependent Physical Parameters

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