Journal
NANOMATERIALS
Volume 11, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/nano11061553
Keywords
laser ablation; supercritical fluid; supercritical carbon dioxide; plasmonic nanoparticles
Categories
Funding
- Russian Foundation for Basic Research [18-29-06056mk]
- Ministry of Science and Higher Education
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Two methods are proposed for synthesizing bimetallic Au/Ag nanoparticles, utilizing different geometric configurations and laser sources. The first configuration demonstrates the possibility of obtaining Ag/Au alloy nanoparticles, while the second configuration shows the possibility of obtaining core-shell bimetallic Au/Ag nanoparticles.
Two approaches are proposed for the synthesis of bimetallic Au/Ag nanoparticles, using the pulsed laser ablation of a target consisting of gold and silver plates in a medium of supercritical carbon dioxide. The differences between the two approaches related to the field of green chemistry are in the use of different geometric configurations and different laser sources when carrying out the experiments. In the first configuration, the Ag and Au targets are placed side-by-side vertically on the side wall of a high-pressure reactor and the ablation of the target plates occurs alternately with a stationary wide horizontal beam with a laser pulse repetition rate of 50 Hz. In the second configuration, the targets are placed horizontally at the bottom of a reactor and the ablation of their parts is carried out by scanning from above with a vertical narrow laser beam with a pulse repetition rate of 60 kHz. The possibility of obtaining Ag/Au alloy nanoparticles is demonstrated using the first configuration, while the possibility of obtaining core-shell bimetallic Au/Ag nanoparticles with a gold core and a silver shell is demonstrated using the second configuration. A simple model is proposed to explain the obtained results.
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