Koren I. Composites of polyaniline with semiconductor and metallic micro-and nanoparticles.

In PhD thesis has been investigated ways of synthesis and first obtained hybrid composites with semiconductor polyaniline (GaSe) and metal (Ag, Au, Pt, Pd) micro-and nanoparticles. The formation mechanism for polyaniline composites with metallic or semiconducting fillers in one-and two-stage synthesis has been shown. It was shown that polyaniline composites with nanoparticles of gallium selenides (6 - 25% wt.) are formed by the mechanism of "core-shell" and they preserve semiconductor conductivity with activation energy of the charge transfer 0,19-0,25 eV. It has been found that polymerization of aniline occurs in the interlayer space of GaSe in addition to encapsulation, using the data of electron microscopy and X-ray microanalysis. This phenomenon causes GaSe particle size reduction to 45 ± 3 nm due to delamination planes, and as result new bands appeare in the сathodoluminescence spectra of composites (1.95, 2.18 and 2.56 eV) compared with the initial GaSe (1,9 and 2,06 eV ). It has been shown that the conductivity of polyaniline-silver composites dependence on mass fraction of silver and can be described by a typical percolation curve. The intrinsic conductivity of the polymer matrix and its morphology at the nanoscale influences on the specific conductivity of composites. Morphology is changing from plastic to metal with a transition through an ordered state with increasing of silver content in composites. Possibility of one-step formation for polymer-metal composites in microemulsion polymerization of aniline in the presence of precious metals compounds Ag, Au, Pt, Pd has been investigated. It has been shown that new chemical compounds, such as Pdx((C6H7N)n)y, can be obtained. It was found that PAn-Au composite has high electrochemical activity in reaction of glucose oxidation. It can be use in construction of amperometric sensors.