Self-Assembly of Ag2S Colloidal Nanoparticles Stabilized by MPS in Water Solution

Svetlana V Rempel; Yulia V Kuznetsova; Andrey A Rempel

doi:10.1021/acsomega.0c01994

Self-Assembly of Ag₂S Colloidal Nanoparticles Stabilized by MPS in Water Solution

ACS Omega. 2020 Jul 2;5(27):16826-16832. doi: 10.1021/acsomega.0c01994. eCollection 2020 Jul 14.

Authors

Svetlana V Rempel^{1

2}, Yulia V Kuznetsova¹, Andrey A Rempel^{1

2

3}

Affiliations

¹ Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, 91, Pervomaiskaya Street, 620990 Ekaterinburg, Russia.
² Ural Federal University, 19, Mira Street, 620002 Ekaterinburg, Russia.
³ Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences, 101, Amundsena Street, 620016 Ekaterinburg, Russia.

Abstract

Self-assembly of colloidal Ag₂S nanoparticles (NPs) was studied in the presence of (3-mercaptopropyl)trimethoxysilane (MPS). Solutions with different molar ratios of Ag₂S/MPS were prepared. The appearance of nano- and microtubes was detected. Self-organized NPs were studied with optical microscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and high-resolution transmission electron microscopy (HRTEM). Silicon nuclear magnetic resonance spectroscopy (²⁹Si NMR) was used to study polycondensation of MPS molecules. Geometrical parameters of the nano- and microtubes depended on the molar ratio of Ag₂S/MPS. The scheme and mechanism of self-assembly of Ag₂S NPs in nanotubes in the presence of MPS were proposed. The effect of MPS on the preservation of the initial stoichiometry of Ag₂S NPs was discussed.