Igor P. Shcherbakov

CQD/PEDOT:PSS composites were prepared via the hydrothermal method from glucose carbon quantum dots (CQDs) and an aqueous solution of PEDOT:PSS conducting polymer and their electrical and optical properties were investigated. The morphology and structure of these samples were investigated by AFM, SEM, EDX, and EBSD. It was found that the CQDs and CQD/PEDOT:PSS composites had a globular structure with globule sizes of ~50–300 nm depending on the concentration of PEDOT:PSS in these composites. The temperature dependence of the resistivity was obtained for the CQD/PEDOT:PSS (3%, 5%, 50%) composites, which had a weak activation character. The charge transport mechanism was discussed. The dependence of the resistivity on the storage time of the CQD/PEDOT:PSS (3%, 5%, 50%) composites and pure PEDOT:PSS was obtained. It was noted that mixing CQDs with PEDOT:PSS allowed us to obtain better electrical and optical properties than pure CQDs. CQD/PEDOT:PSS (3%, 5%, 50%) composites are more conductive composites than pure CQDs, and the absorbance spectra of CQD/PEDOT:PSS composites are a synergistic effect of interaction between CQDs and PEDOT:PSS. We also note the better stability of the CQD/PEDOT:PSS (50%) composite than the pure PEDOT:PSS film. CQD/PEDOT:PSS (50%) composite is promising for use as stable hole transport layers in devices of flexible organic electronics.

Synthetic quartz single crystals are subjected to fracture by a falling load in the temperature range from 20 to 650°C (i.e., including the region of the α → β phase transition). The intensity of inte

The results of high-speed recording of fractal luminescence (FL) and acoustic emission (AE) during the impact fracture of the surface of quartz ceramic are presented. FL results from the breakage of c

The modification of the copper slab surface submicrorelief by applying a current pulse of density higher than J _thr. The passage of a high-density current is shown to change the pattern of the copper slab polished surface, resulting in the formation of regular periodic structures. These structures are produced when moving dislocations emerge on the specimen surface.