On the nature of citrate-derived surface species on Ag nanoparticles: insights from X-ray photoelectron spectroscopy
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URI (для ссылок/цитирований):
http://www.sciencedirect.com/science/article/pii/S0169433217326417https://elib.sfu-kras.ru/handle/2311/69611
Автор:
Yuri L. Mikhlin
Sergey A. Vorobyev
Svetlana V. Saikova
Elena A. Vishnyakova
Alexander S. Romanchenko
Sergey M. Zharkov
Yurii V. Larichev
Коллективный автор:
Институт цветных металлов и материаловедения
Кафедра физической и неорганической химии
Дата:
2017-09Журнал:
Applied Surface ScienceКвартиль журнала в Scopus:
Q1Квартиль журнала в Web of Science:
Q1Библиографическое описание:
Yuri L. Mikhlin. On the nature of citrate-derived surface species on Ag nanoparticles: insights from X-ray photoelectron spectroscopy [Текст] / Yuri L. Mikhlin, Sergey A. Vorobyev, Svetlana V. Saikova, Elena A. Vishnyakova, Alexander S. Romanchenko, Sergey M. Zharkov, Yurii V. Larichev // Applied Surface Science. — 2017.Аннотация:
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 near-edge spectroscopy, and other techniques in order to
determine the surface composition and to specify the citrate-related species at Ag nanoparticles
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immobilized from the dense hydrosol prepared using room-temperature 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.