Porous spherical gold nanoparticles <i>via</i> a laser induced process

Schmidl, G.; Raugust, M.; Jia, Guobin; Dellith, Andrea; Dellith, Jan; Schmidl, F.; Plentz, Jonathan

doi:10.1039/d2na00396a

Cited by 3 publications

(2 citation statements)

References 40 publications

(60 reference statements)

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“…48 Short laser pulses are used to rapidly heat or melt, or even vaporize and ionize the materials. [49][50][51][52] Such fast and localized deposition of energy can result in local plasma generation. Followed by a fastcooling process, this method produces plasmonic nanoparticles without thermal equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Impact of thermal annealing and laser treatment on the morphology and optical responses of mono- and bi-metallic plasmonic honeycomb lattice

Chen,

Schmidl,

Dellith

et al. 2023

Nanoscale

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Section: Introductionmentioning

confidence: 99%

Impact of thermal annealing and laser treatment on the morphology and optical responses of mono- and bi-metallic plasmonic honeycomb lattice

Chen,

Schmidl,

Dellith

et al. 2023

Nanoscale

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“…The fabrication of porous nanoparticles can happen in several ways such as ambient wet-chemical method [19], nanoimprint lithography [20], one-step solution phase method at room temperature [21], laser-induced process [22], however, the most common and precise way to prepare porous gold nanoparticles is the dewetting-dealloying procedure. Wang et al were the first to prepare porous gold nanoparticles using these two methods over a wide diameter range [23].…”

Section: Introductionmentioning

confidence: 99%

Porous Gold Nanoparticles: Thermal Stability, Optical Response and Support-Free Synthesis

Juhász¹,

Erdélyi²,

Cserháti³

2023

Preprint

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3D metal nanostructures are often the basis of several applications such as in catalysis, plasmonics, medical diagnosis, therapy, drug screening, ophthalmologic, and biomedical applications. Porous gold nanoparticles (PGNs) are intensively investigated due to their outstanding morphological as well as advantageous optical properties. Unfortunately, the thermal stability of these open-porous structures is poor, i.e. even as a result of low-temperature annealing (150$^\circ$C in air), their porosity disappears and they lose their favorable optical properties. In order to preserve their beneficial properties, a thin metal oxide coating can be applied. Changing the coating's thickness and/or composition, the optical response of the PGNs can also be tuned in a wide wavelength region. Moreover, these nanoparticles can be synthesized also in support-free form, which makes them more attractive from an application point of view. This review article summarizes some of the preparation modes of these complex nanostructures (fixed and support-free), as well as their thermal stability and optical responses.

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Refining laser-induced dewetting for bimetallic Au–Pd nanoparticle synthesis on ZnO thin films: Optimizing fluence for substrate integrity

Sánchez-Aké,

Segura-Zavala,

Depablos-Rivera

et al. 2024

Journal of Laser Applications

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We report the fabrication of metal alloy Au–Pd nanoparticles on semiconductor thin film substrates (ZnO) by laser-induced dewetting. Employing a UV excimer laser, a single pulse was directed onto a three-layer film stack on a glass substrate: glass/ZnO/Au/Pd and glass/ZnO/Pd/Au. We simulated the temperature attained by the thin films enabling the prediction of energy thresholds required for melting the metal films but avoiding modifying the ZnO film. A specific range is reported of the pulse energy conducive to nanoparticle formation and the energy threshold required to modify the ZnO film beneath them. Depending on the pulse energy applied, the mean diameter of the nanoparticles varied from approximately 150 to around 70 nm. Notably, higher fluences resulted in smaller particles but also induced surface cracks in the ZnO film. Additionally, we observed a reduction in nanoparticle size with increased Pd content. Our results show that laser-induced dewetting can produce bimetallic alloy nanoparticles and, at the same time, ensure the preservation of the optical properties of the ZnO film. This approach opens avenues for tailoring material characteristics and expanding the range of applications of metal nanoparticles on semiconductor-based systems.

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Porous spherical gold nanoparticles via a laser induced process

Abstract: Nanoparticles consisting of a mixture of several metals and also porous nanoparticles due to their special structure exhibit properties that find application in spectroscopic detection or catalysis.

Cited by 3 publications

References 40 publications

Impact of thermal annealing and laser treatment on the morphology and optical responses of mono- and bi-metallic plasmonic honeycomb lattice

Impact of thermal annealing and laser treatment on the morphology and optical responses of mono- and bi-metallic plasmonic honeycomb lattice

Porous Gold Nanoparticles: Thermal Stability, Optical Response and Support-Free Synthesis

Refining laser-induced dewetting for bimetallic Au–Pd nanoparticle synthesis on ZnO thin films: Optimizing fluence for substrate integrity

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