Formation of gold/silver composite nanoparticles by pulsed laser ablation of gold–silver layered films in liquid
Nanoparticles of high purity can be produced from a variety of materials by pulsed laser ablation of solids in liquid. Composite nanoparticles are of great importance in various applications such as catalysis or biomedicine and the process of their formation is still a subject of intense research. I...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
2022
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| Sorozat: | APPLIED PHYSICS A - MATERIALS SCIENCE AND PROCESSING
128 No. 9 |
| Tárgyszavak: | |
| doi: | 10.1007/s00339-022-05938-7 |
| mtmt: | 33134651 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/26273 |
| Tartalmi kivonat: | Nanoparticles of high purity can be produced from a variety of materials by pulsed laser ablation of solids in liquid. Composite nanoparticles are of great importance in various applications such as catalysis or biomedicine and the process of their formation is still a subject of intense research. In this work, gold/silver composite nanoparticles were synthesized in aqueous media by ns pulsed laser ablation of gold–silver multilayer targets with different absolute layer thicknesses and layer thickness ratios. The generated nanoparticles showed a log-normal distribution of sizes, with average diameter in the 20–40 nm range and standard deviation of 9–30 nm. By comparing the UV–VIS absorbance spectra of the nanoparticle colloids with two theoretical calculations (based on the Mie and the BEM model), it was found that there is a direct correlation between the average Au and Ag content of the nanoparticles and the composition of the films on the substrate. Assuming thermal ablation, our model calculations showed that there is a maximum thickness of the top layer up to which both layers can be ablated simultaneously and alloy nanoparticles can be produced. |
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| Terjedelem/Fizikai jellemzők: | 13 |
| ISSN: | 0947-8396 |