Carrier gas-driven compositional variations of platinum-tungsten nanoparticles generated by spark ablation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F25%3A00605484" target="_blank" >RIV/61388998:_____/25:00605484 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0021850225000151?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0021850225000151?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jaerosci.2025.106538" target="_blank" >10.1016/j.jaerosci.2025.106538</a>

Result language

angličtina

Original language name

Carrier gas-driven compositional variations of platinum-tungsten nanoparticles generated by spark ablation

Original language description

Bimetallic nanoparticles are of interest in various catalytic applications as cost-effective replacements for precious metal catalysts. Ongoing research is aimed at developing new techniques to produce nanoparticles with precise control of their composition, size, and structure. In this study, we investigated the tuning of the composition of platinum–tungsten bimetallic nanoparticles by spark ablation. Using pure electrodes, the spark ablation method offers the possibility of forming mixed nanoparticles and adjusting their size and composition by modifying the carrier gas mixture. Morphological, structural, and compositional characterizations by High-Angle Annular Dark-Field (HAADF) and Bright Field (BF) imaging in Scanning Transmission Electron Microscopy (STEM) and Energy Dispersive X-ray (EDX) microanalysis were used to evaluate the nanoparticle size distribution and the ratio of Pt to W, whereas interlayer d-spacings were quantified using the Selected Area Electron Diffraction (SAED) technique. Similar to previous studies that have demonstrated homogeneous internal nanoparticle mixing with different electrodes, we observed that the nanoparticles generated from the monometallic electrodes were mixed mostly homogeneously. Additionally, we demonstrate that the use of platinum as the initial anode and tungsten as the initial cathode in a nitrogen atmosphere can promote the formation of core-shell nanostructures. A theoretical model of electrode ablation was developed using the current and voltage discharge profiles to estimate the composition of the synthesized nanoparticles. The modeling revealed a longer period between platinum electrode evaporation and tungsten electrode evaporation during spark discharges as a potential reason for core-shell formation.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

21001 - Nano-materials (production and properties)

Project

<a href="/en/project/TN02000069" target="_blank" >TN02000069: National centre of competence for Materials, Advanced Technologies, Coatings and their Applications</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Aerosol Science

ISSN

0021-8502

e-ISSN

1879-1964

Volume of the periodical

185

Issue of the periodical within the volume

March

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

14

Pages from-to

106538

UT code for WoS article

001412878800001

EID of the result in the Scopus database

2-s2.0-85215807240