Тип публикации: статья из журнала
Год издания: 2017
Идентификатор DOI: 10.1134/S0022476617070150
Ключевые слова: copper sulfides, dynamic light scattering, hydrosols, nanoparticles, optical spectroscopy, powder XRD, TEM, XPS
Аннотация: Stable hydrosols of copper sulfide nanoparticles are synthesized by heating aqueous solutions with different ratios of sodium thiosulfate and copper sulfate in the presence of polyvinylpyrrolidone and studied by a number of physicochemical methods in situ (optical spectroscopy, dynamic light scattering) and ex situ (transmission elПоказать полностьюectron microscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy). The main product is CuS covellite nanoparticles with some impurities of other phases (Cu2S, Cu1,8S, Cu7S4). With an increase in the initial molar ratio S2O 2− 3 / Cu from 0.2 to 5 the nanoparticle size increases from 1-5 nm to 30-50 nm and then decreases to 4 nm at a ratio of 10. A substantial increase in the intensity of plasmon absorption within 800-1500 nm is observed during the formation of planar nanoparticles with a lateral size of about 30 nm at S2O 2− 3:Cu = 5. A band gap obtained from both direct and indirect optical absorption spectra of sulfides (2.6 eV and 1.7 eV respectively) remains constant for all particles. © 2017, Pleiades Publishing, Ltd.
Журнал: Journal of Structural Chemistry
Выпуск журнала: Vol. 58, Is. 7
Номера страниц: 1383-1390
ISSN журнала: 00224766
Издатель: Maik Nauka Publishing / Springer SBM