2019, Dideykin, A. T., Chvalun, S. N., Vasiliev, A. L., Grigoryev, T. E., Lebedev-Stepanov, P. V., Лебедев-Степанов, Петр Владимирович

© 2019, Pleiades Publishing, Inc.Abstract: The formation of thin-film coatings from detonation nanodiamond (DND) suspensions on atomically ordered conducting Ni–W substrates by self-assembly in an evaporating aqueous solution using the spin coating technique has been investigated. It is shown that, in the absence of a polymer matrix, the DND distribution over the substrate is nonuniform and the adhesion to the substrate is weak, which prevents obtaining a uniform and stable emission current. The use of DND–water-soluble polymer (chitosan and carrageenan polysaccharides, polyacrylic acid, and sulfonated polyaniline (SPANI)) coatings makes it possible to enhance the film adhesion to the substrate and provide a disaggregated state of nanocrystallites. The DND–SPANI coatings have demonstrated the best emission characteristics. Based on the analysis of the emission characteristics, a new model of emission center in the DND–polymer–substrate system has been proposed.

2021, Kamyshinsky, R. A., Kuznetsov, N. M., Stepko, A. S., Chvalun, S. N., Lebedev-Stepanov, P. V., Лебедев-Степанов, Петр Владимирович

© 2021, Pleiades Publishing, Inc.Abstract: A comprehensive analysis of an aqueous solution of gold nanoparticles with an average size of 6 nm in a citrate buffer has been carried out, with investigation of the solution rheology and structure by electron and atomic force microscopy. A deviation of the rheological behavior of hydrosol from the Newtonian properties is found even at low gold nanoparticle concentrations. The specific features of the rheological behavior of hydrosol are explained based on the transmission electron microscopy (TEM) data.