Oxidation of Ag nanoparticles in aqueous media: Effect of particle size and capping

Тип публикации: статья из журнала

Год издания: 2014

Идентификатор DOI: 10.1016/j.apsusc.2014.01.081

Ключевые слова: Silver nanoparticles, Oxidation, Resistive switching effect, X-ray photoelectron spectroscopy, Oxidation, Resistive switching effect, Silver nanoparticles, X-ray photoelectron spectroscopy

Аннотация: Many applications and environmental impact of silver-bearing nanomaterials critically depend upon their specific reactivity, which is still poorly understood. Here, silver nanoparticles (Ag NPs) of about 3-5 nm and 10-12 nm in diameter, uncapped and capped with l-glucose or citrate, were prepared, characterized using UV-vis absorption spectroscopy, SAXS, TEM, and their (electro) chemical oxidation was examined in comparison with each other and bulk metal applying scanning tunneling microscopy and spectroscopy, cyclic voltammetry, and XPS. A resistive switching effect was found in the tunneling spectra measured in air at the smaller uncapped Ag NPs deposited on HOPG and was interpreted in terms of Ag transfer between the particle and the probe. The anodic oxidation of these Ag NPs in 1 M NaOH yielded 3D Ag2O, while only a layer of "primary"Ag(I) oxide emerged on larger uncapped nanoparticles during the potential sweep. The formation of AgO at higher potentials proceeded readily at the "primary"oxide but was retarded at the smaller NPs. The citrate- and glucose-capping substantially impeded the formation both of Ag2O and AgO. The findings highlighted, particularly, a non-trivial effect of particle size and transient mobilization of Ag species on the reactions of silver nanoparticles. (c) 2014 Elsevier B.V. All rights reserved.

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Издание

Журнал: APPLIED SURFACE SCIENCE

Выпуск журнала: Vol. 297

Номера страниц: 75-83

ISSN журнала: 01694332

Место издания: AMSTERDAM

Издатель: ELSEVIER SCIENCE BV

Авторы

  • Mikhlin Y.L. (Institute of Chemistry and Chemical Technology of the Siberian Branch,Russian Academy of Sciences)
  • Vishnyakova E.A. (Siberian Federal University)
  • Romanchenko A.S. (Institute of Chemistry and Chemical Technology of the Siberian Branch,Russian Academy of Sciences)
  • Likhatski M.N. (Institute of Chemistry and Chemical Technology of the Siberian Branch,Russian Academy of Sciences)
  • Saikova S.V. (Siberian Federal University)
  • Zharkov S.M. (Kirensky Institute of Physics of the Siberian Branch of the Russian Academy of Sciences)
  • Larichev Y.V. (Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Sciences)
  • Tuzikov F.V. (Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Sciences)
  • Zaikovskii V.I. (Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Sciences)

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