Metal nanostructures with complex surface morphology: The case of supported lumpy Pd and Pt nanoparticles produced by laser processing of metal films

Ruffino, F.; Maugeri, Pietro; Cacciato, G.; Zimbone, Massimo; Grimaldi, Maria Grazia

doi:10.1016/j.physe.2016.05.013

Cited by 9 publications

(6 citation statements)

References 84 publications

(126 reference statements)

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“…The difference between these size distributions is clearly evident: in (a) all the NPs belong to an unique population characterized by an unique peak in the distribution; in (b) the NPs belong to two different subpopulations each with a proper peak in the distribution. The reason for this evolution of the NPs size distribution when increasing the film thickness is, reasonably, the following [69,70]: until a critical metal film thickness (which is material-dependent) the temperature of a metal film irradiated by the nanosecond laser increases when the film thickness increases [71]. Thus, at a high enough thickness, the metal film can reach a temperature higher than the metal boiling temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, fixing the substrate, the critical thickness dc identifies a change in the dewetting characteristics of the AuPd film. The consequence is photo-fragmentation of the NPs, which are formed by the dewetting process [69,70]. This fragmentation can occur, for example, but not only, by metal atoms which evaporate from large formed metal clusters.…”

Section: Resultsmentioning

confidence: 99%

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Experimental Analysis on the Molten-Phase Dewetting Characteristics of AuPd Alloy Films on Topographically-Structured Substrates

Ruffino¹

2017

Metals

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AuPd nanoparticles are formed on fluorine-doped tin oxide (FTO) by a nanosecond laser irradiation-induced dewetting process of deposited AuPd films. In particular, we analyze the effect of the surface topography of the substrate on the dewetting process and, so, on the final mean size of the formed nanoparticles. In fact, we used two supporting FTO substrates differing in the surface topography: we used a FTO layer which is un-intentionally patterned since it is formed by FTO pyramids randomly distributed on the glass slide as result of the deposition process of the same FTO layer, namely substrate A. We used, also, a further FTO substrate, namely substrate B, presenting, as a result of a chemical etching process, a higher roughness and higher mean distance between nearest-neighbor pyramids with respect to substrate A. The results concerning the size of the obtained AuPd NPs by the laser irradiations with the laser fluence fixed shows that the substrate topography impacts on the dewetting process. In particular, we found that below a critical thickness of the deposited AuPd film, the NPs formed on substrates A and B have similar size and a similar trend for the evolution of their size versus the film thickness (i.e., the dewetting process is not influenced by the substrate topography since the film does not interact with the substrate topography). On the other hand, however, above a critical thickness of the deposited AuPd film, the AuPd NPs show a higher mean size (versus the film thickness) on substrate B than on substrate A, indicating that the AuPd film interacts with the substrate topography during the dewetting process. These results are quantified and discussed by the description of the substrate topography effect on the excess of chemical potential driving the dewetting process.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Experimental Analysis on the Molten-Phase Dewetting Characteristics of AuPd Alloy Films on Topographically-Structured Substrates

Ruffino¹

2017

Metals

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“…The irradiations result in the metallic films melting, followed by holes being formed in the films (reaching the substrate surface) and films retreating away from the holes towards the formation of droplets of a circular section. At the higher fluence values, the vaporization and recondensation of the droplets can also occur [24,25]. Through the inspection of the SEM images in Figures 2 and 3 we can conclude that the laser irradiations led to the formation of spherical particles, and when the starting thickness of the deposited metal film was fixed, by increasing the laser fluence, a strong modification of the nanoparticles occurred.…”

Section: Morphological Analysesmentioning

confidence: 89%

Section: Morphological Analysesmentioning

confidence: 99%

A Study of the Laser-Assisted Alloying Effect on Plasmonic Properties of Au-Pd Nanostructured Film Using Surface-Enhanced Raman Spectroscopy

Awada

Ruffino

2023

Coatings

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In this work, we report a study on the effect of the laser-assisted alloying effect on plasmonic properties of Pd and Au-Pd nanostructures using surface-enhanced Raman spectroscopy (SERS). The monometallic and bimetallic nanostructures are formed by nanosecond-laser induced de-wetting and the alloying of pure Pd and bimetallic Au-Pd nanoscale-thick films deposited on a transparent and conductive substrate. The morphological characteristics of the nanostructures were changed by controlling the laser fluence. Then, 4-nitrithiophenol (4-NTP) was used as an adsorbed molecule on the surface of the nanostructures to analyze the resulting SERS properties. A quantitative analysis was reported using the SERS profile properties, such as FWHM, amplitude, and Raman peak position variation. An excellent correlation between the variation of SERS properties and the nanostructures’ size was confirmed. The optical enhancement factor was estimated for Pd and Au-Pd nanostructures for the laser fluence (0, 0.5, 0.75, 1, and 1.5 J/cm2).

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“…The production of metallic nanoparticles on surfaces has received great attention due to the enormous surface‐volume ratio compared to the correspondent bulk materials, and which make them useful for many applications in several fields as in plasmonics, energy production and storage, photonics . Among the various species of metallic nanoparticles (NPs), Pt and Pd NPs find important devices applications for sensing detection, catalysis, direct alcohol fuel cells, hydrogen storage, etc .…”

Section: Introductionmentioning

confidence: 99%

Self‐Organization Based Fabrication of Bimetallic PtPd Nanoparticles on Transparent Conductive Oxide Substrates

Censabella

Ruffino

Zimbone

et al. 2017

Physica Status Solidi (a)

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Bimetallic PtPd nanoparticles are of special interest for their tunable properties in a wide range of applications as plasmonics, energy storage, catalysis. So, in this work we present a simple and versatile method for the production of bimetallic PtPd nanoparticles on a transparent and conductive substrate, such as fluorine-doped tin oxide/glass (FTO/glass) substrate. The method is based on the deposition of thin Pt/Pd bilayers on the FTO substrate. Then, we induced the melting, alloying, and dewetting process of the Pt and Pd layers by nanosecond laser irradiation with the consequent formation of the bimetallic PtPd nanoparticles. We characterized the nanoparticles by Scanning Electron Microscopy, Rutherford backscattering spectrometry, and X-Ray Diffraction measurements. In particular, the microscopic analysis showed that the average diameter of the nanoparticles is independent on the thickness of the deposited bilayers and on the layers sequence. On the other hand, the X-ray diffraction measurements confirmed that the structure of the nanoparticles consists in a PtPd alloy structure. The formation process of the nanoparticles is, finally, discussed on the basis of the general microscopic mechanisms involved in the laser-induced melting, alloying, and dewetting of the metallic films.

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Metal nanostructures with complex surface morphology: The case of supported lumpy Pd and Pt nanoparticles produced by laser processing of metal films

Cited by 9 publications

References 84 publications

Experimental Analysis on the Molten-Phase Dewetting Characteristics of AuPd Alloy Films on Topographically-Structured Substrates

Experimental Analysis on the Molten-Phase Dewetting Characteristics of AuPd Alloy Films on Topographically-Structured Substrates

A Study of the Laser-Assisted Alloying Effect on Plasmonic Properties of Au-Pd Nanostructured Film Using Surface-Enhanced Raman Spectroscopy

Self‐Organization Based Fabrication of Bimetallic PtPd Nanoparticles on Transparent Conductive Oxide Substrates

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