I. E. Kotenko

Solvothermal Preparation and Magnetic Properties of Monodisperse Superparamagnetic Nanosized Ferrites MFe2O4 (M = Mn, Co, Ni)

Monodisperse spherical nanoparticles of MIIFe2III O4 (M = Mn, Co, Ni) with controlled diameter (5-20 nm) were synthesized by solvothermal decomposition of [MIIFe2III O(CH3CO2)6(H2O)3] complexes in poly- and tetraethylene glycol. The samples were studied by XRD, TEM, and SQUID magnetometry. The nanoparticles have superparamagnetic behavior. The blocking temperature, magnetization, and magnetic anisotropy barrier decrease, while the magnetic anisotropy constant increases with decreasing particle size.

Metallic Conductivity of Mechanochemically Doped Polyaniline

It was shown that the conductivity of polyaniline can be increased significantly as a result of mechanochemical doping with camphorsulfonic acid and secondary doping with m-cresol in comparison with the conductivity of the polymer synthesized by the traditional method. The obtained polymer has a nanofibrillar structure and is characterized by a metallic type of temperature dependence of the conductivity over a wide range of temperatures.

Mechanochemically Prepared Nanocomposites Based on Polyaniline and Molybdenum and Tungsten Disulfides as Electrode Materials for Supercapacitors

Hybrid nanocomposites with different composition prepared from polyaniline (PAni) and exfoliated MoS2 and WS2 were prepared by a mechanochemical method and studied as electrodes of symmetrical supercapacitors (SSC). Nanoparticles of MoS2 and WS2 have been found to promote electrochemical reversibility of redox conversion in PAni at high potentials and contribute to the stability of these nanocomposites during prolonged charge-discharge cycling. The specific capacity of such materials can reach 600 F/g and the specific power of SSC can reach ~4.1 kW/kg for specific energy ~23.5 W·h/kg.

Composite Materials Based on Layered Molybdenum Disulfide and Metallic Gold Nanoparticles

The nature of the solvent and the concentration significantly affect both the efficiency of the ultrasonic liquid-phase exfoliation of molybdenum disulfide and the structure of the resultant semiconductor particles. The reaction of MoS2 and H[AuCl4] in aqueous ethanol solution leads to the formation of MoS2/Au composite materials, whose morphology is a function of the preparative conditions of the oxidation-reduction reaction.