Journal
JOURNAL OF STRUCTURAL CHEMISTRY
Volume 58, Issue 7, Pages 1383-1390Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S0022476617070150
Keywords
nanoparticles; copper sulfides; hydrosols; optical spectroscopy; XPS; powder XRD; TEM; dynamic light scattering
Funding
- RFBR [14-17-00280]
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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 electron 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.
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