On the nature of citrate-derived surface species on Ag nanoparticles: insights from X-ray photoelectron spectroscopy
URI (for links/citations):http://www.sciencedirect.com/science/article/pii/S0169433217326417
Vorobyev, S. A.
Saykova, S. V.
Vishnyakova, E. A.
Romanchenko, A. S.
Жарков, С. М.
Larichev, Yu. V.
Институт цветных металлов и материаловедения
Кафедра материаловедения и технологии обработки материалов
Кафедра физической и неорганической химии
Journal Name:Applied Surface Science
Journal Quartile in Scopus:Q1
Journal Quartile in Web of Science:Q1
Bibliographic Citation:Mikhlin Yu.L. On the nature of citrate-derived surface species on Ag nanoparticles: insights from X-ray photoelectron spectroscopy [Текст] / Mikhlin Yu.L, S. A. Vorobyev, S. V. Saykova, E. A. Vishnyakova, A. S. Romanchenko, С. М. Жарков, Yu. V. Larichev // Applied Surface Science. — 2018. — Т. 427 (B). — С. 687-694
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.
Citrate is an important stabilizing, reducing, and complexing reagent in the wet chemical synthesis of nanoparticles of silver and other metals, however, the exact nature of adsorbates, and its mechanism of action are still uncertain. Here, we applied X-ray photoelectron spectroscopy, soft X-ray absorption nearedge spectroscopy, and other techniques in order to determine the surface composition and to specify the citrate-related species at Ag nanoparticles immobilized from the dense hydrosol prepared using roomtemperature reduction of aqueous Ag+ ions with ferrous ions and citrate as stabilizer (Carey Lea method). It was found that, contrary to the common view, the species adsorbed on the Ag nanoparticles are, in large part, products of citrate decomposition comprising an alcohol group and one or two carboxylate bound to the surface Ag, and minor unbound carboxylate group; these may also be mixtures of citrate with lower molecular weight anions. No ketone groups were specified, and very minor surface Ag(I) and Fe (mainly, ferric oxyhydroxides) species were detected. Moreover, the adsorbates were different at AgNPs having various size and shape. The relation between the capping and the particle growth, colloidal stability of the high-concentration sol and properties of AgNPs is briefly considered.