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Facile synthesis of SnO2 shell followed by microwave treatment for high environmental stability of Ag nanoparticles

机译：SnO2壳体的容易合成，然后进行微波处理，用于Ag纳米粒子的高环境稳定性

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This study describes a new method for passivating Ag nanoparticles (AgNPs) with SnO _(2) layer and their further treatment by microwave irradiation. The one-step process of SnO _(2) layer formation was carried out by adding sodium stannate to the boiling aqueous AgNPs solution, which resulted in the formation of core@shell Ag@SnO _(2) nanoparticles. The coating formation was a tunable process, making it possible to obtain an SnO _(2) layer thickness in the range from 2 to 13 nm. The morphology, size, zeta-potential, and optical properties of the Ag@SnO _(2) NPs were studied. The microwave irradiation significantly improved the environmental resistance of Ag@SnO _(2) 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@SnO _(2) 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 SnO _(2) layer were resistant to cyanide up to 0.1 wt%. The microwave-treated SnO _(2) 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.
机译：该研究描述了一种用SnO _（2）层钝化Ag纳米颗粒（AgNP）的新方法及其通过微波辐射进一步处理。通过将钠静止的AgNPS溶液中添加硅酸钠加入甲磺酸℃，导致核心_（2）纳米粒子的形成，进行SnO _（2）层形成的一步过程。涂层形成是可调谐的工艺，使得可以在2至13nm的范围内获得SnO _（2）层厚度。研究了AG @ SnO _（2）NP的形态，大小，ζ电位和光学性质。微波辐射显着改善了Ag @ SnO _（2）NP的耐环境性，其在不同的生物溶液中保持稳定，例如在0.1μm的150mm和0.1μm，Tris缓冲盐水缓冲液的不同生物溶液中稳定，pH 5.6的磷酸盐缓冲液，7.0和8.0。微波辐射后AG @ SnO _（2）NPS在生物相关的pH值下也稳定，高度酸性（1.4）和碱（13.2）。此外，用13nm厚的SnO _（2）层覆盖的AgNPS对氰化物耐高达0.1wt％。微波处理的SnO _（2）壳可以促进在各种溶液中引入AgNP，并通过保护来自溶解和聚集的金属纳米结构来延长其在生物环境中的潜在应用。

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