Facile synthesis of SnO2 shell followed by microwave treatment for high environmental stability of Ag nanoparticles. Issue 63 (23rd October 2020)

• Record Type: Journal Article
• Authors: Baranowska-Korczyc, Anna; Mackiewicz, Ewelina; Ranoszek-Soliwoda, Katarzyna; Grobelny, Jarosław; Celichowski, Grzegorz
• Is Part Of: RSC advances. Volume 10:Issue 63(2020)
• Page Start: 38424
• Page End: 38436
• Publication Date: 2020-10-23
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra06159j
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : This study describes a new method for passivating Ag nanoparticles (AgNPs) with SnO2 layer and their further treatment by microwave irradiation. Abstract : This study describes a new method for passivating Ag nanoparticles (AgNPs) with SnO2 layer and their further treatment by microwave irradiation. The one-step process of SnO2 layer formation was carried out by adding sodium stannate to the boiling aqueous AgNPs solution, which resulted in the formation of core@shell Ag@SnO2 nanoparticles. The coating formation was a tunable process, making it possible to obtain an SnO2 layer thickness in the range from 2 to 13 nm. The morphology, size, zeta-potential, and optical properties of the Ag@SnO2 NPs were studied. The microwave irradiation significantly improved the environmental resistance of Ag@SnO2 NPs, which remained stable in different biological solutions such as NaCl at 150 mM and 0.1 M, Tris-buffered saline buffer at 0.1 M, and phosphate buffer at pH 5.6, 7.0, and 8.0. Ag@SnO2 NPs after microwave irradiation were also stable at biologically relevant pH values, both highly acidic (1.4) and alkaline (13.2). Moreover, AgNPs covered with a 13 nm-thick SnO2 layer were resistant to cyanide up to 0.1 wt%. The microwave-treated SnO2 shell can facilitate the introduction of AgNPs in various solutions and extend their potential application in biological environments by protecting the metal nanostructures from dissolution and aggregation.