Diffusive Formation of Au/Ag Alloy Nanoparticles of Governed Composition in Glass

• Published in: Nanomaterials (Basel, Switzerland) Vol. 12; no. 23; p. 4202
• Main Authors: Babich, Ekaterina, Reduto, Igor, Lipovskii, Andrey
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 26.11.2022; MDPI
• Subjects: alloy nanoparticles; Alloys; Catalysis; Etching; glass; Glass substrates; Gold; Gold base alloys; Heat; Heat treatment; Heat treatments; ion-exchange; Morphology; Nanoalloys; Nanoparticles; Oxidation; Raman spectra; Raman spectroscopy; Severe acute respiratory syndrome coronavirus 2; Silver; Specialty metals industry; Spectroscopy; Spectrum analysis; Surface plasmon resonance; United Kingdom > UK; United States > US; Germany; gold; alloy nanoparticles; glass; silver; ion-exchange
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano12234202

For the first time we show that the introduction of silver ions in the glass containing gold nanoparticles (NPs) and additional heat treatment of the glass in the air lead to the formation of Au/Ag alloy NPs. The proposed approach makes it possible to position localized surface plasmon resonance of the NPs by selecting the heat treatment temperature, which determines the silver proportion in the alloy NPs. This allows for expanding customizability of NPs for applications in surface-enhanced Raman scattering spectroscopy, catalysis and biochemistry. Developed technique benefits from the presence of silver in the glass in ionic form, which prevents the oxidation of silver and provides stable preparation of Au/Ag alloy NPs.