A novel one-pot chemical synthesis of functional copper iodide-polypyrrole composites, CuI-PPy, has been proposed. The fabrication process allows the formation of nanodimensional metal salt/polymer hybrid structures in a fully controlled time- and concentration-dependent manner. The impact of certain experimental conditions, viz., duration of synthesis, sequence of component addition and concentrations of the intact reagents on the structure, dimensionality and yield of the end-product was evaluated in detail. More specifically, the amount of marshite CuI within the hybrid composite can be ranged from 60 to 90 wt.%, depending on synthetic conditions (type and concentration of components, process duration). In addition, the conditions allowing the synthesis of nano-sized CuI distributed inside the polypyrrole matrix were found. A high morphological stability and reproducibility of the synthesized nanodimensional metal-polymer hybrid materials were approved. Finally, the electrochemical activity of the formed composites was verified by cyclic voltammetry studies. The stability of CuI-PPy composite deposited on the electrodes was strongly affected by the applied anodic limit. The proposed one-pot synthesis of the hybrid nanodimensional copper iodide-polypyrrole composites is highly innovative, meets the requirements of Green Chemistry and is potentially useful for future biosensor development. In addition, this study is expected to generally contribute to the knowledge on the hybrid nano-based composites with tailored properties.

Влияние осаждения частиц кобальта на квантовые поправки к проводимости Друде в твистированном CVD графене

Electrochemical deposition of cobalt onto the single-layer CVD graphene draw to the formation of Co-CoO/graphene composites with increased electrical resistance and magnetoresistance. It is shown that magnetoresistance is governed with two competing mechanisms – negative (NMR) and positive (PMR). NMR at low magnetic fields could be well described with localized quantum corrections to the Drude conductivity in graphene. The enhancement of PMR at high magnetic fields could be associated with the influence of Lorentz mechanism in Co-CoO particles.

The effect of deposited aggregates of Co–CoO nanoparticles with an average diameter of 160 nm on the charge carrier concentration and carrier transport mechanisms in Co–CoO/graphene/SiO₂ hybrid structures has been studied. The structures were obtained by electrochemical deposition of cobalt nanoparticles onto the surface of single-layer CVD graphene in a reverse galvanostatic mode from an electrolyte containing CoSO₄∙6H₂O (1.25 g/l) and NaCl (0.064 g/l) mixture at a cathodic current density of 2.5 mA/cm² and an anodic current density 1.25 mA/cm². It has been shown that deposition of Co–CoO nanoparticles results in an almost twofold decrease in conductivity of structure. We attribute this effect to the exclusion of some of the intrinsic defects of graphene from the carrier transport process in the structure under study.The coexistence of mechanisms of quantum corrections (QC) to the Drude conductivity under conditions of weak localization and usual band (activational) conductivity was discovered. The dominance of the QC to conductivity both before and after the Co–CoO particles deposition, as well as a decrease in the value of the pre-exponential factor σ_a0, included in the activational mechanism, from 2.8∙10^-4 S to 3.1∙10^-5 S were observed after particle deposition.

Organic-inorganic hybrid (OIH) material copper iodide-polypyrrole (CuI-PPy) obtained by the one-pot method in aqueous mixed solutions of precursors was used as a bacteriostatic and bactericidal agent in media containing Escherichia coli BB culture. Addition of OIH material at a concentration of 1 mg/mL to the culture media suppressed E. coli growth for 60 h, after which the efficiency of the bacteriostatic action was more than 80%. The use of CuI-PPy as an additive to the paint and varnish coating leads to the death of bacteria after 1 h of contact of the solution with bacterial cells with glass plates coated with CuI-PPy modified paint and varnish coatings. After 12 h of contact, the bactericidal effect of CuI-PPy modified film remains unchanged. The advantages of using OIH material compared to pure CuI are discussed.

Graphene-based hybrid magnetic systems are promising platforms for spintronic applications, yet the mechanisms governing magnetic correlations in these two-dimensional (2D) architectures remain incompletely understood. Here, we investigate the magnetic behavior of Co/CoO core–shell nanoparticles electrochemically deposited on graphene, focusing on the 25–50 K range, where the coercivity and exchange bias field reach their maximum values. Using a modified 2D integral-law framework for approaching magnetic saturation, adapted for 2D systems via the Meyer integral transform, we reconstruct the real-space correlation functions (CFs) of the magnetic anisotropy axes and extract the main micromagnetic parameters. The analysis reveals three distinct types of CFs, monotonic, non-monotonic, and jump-like, which we tentatively associate with different microstructural configurations, including isolated nanoparticles, dense clusters, and sparse conglomerates separated by graphene domain boundaries. The monotonic CFs exhibit long-range coherence of the magnetic anisotropy axes extending over nearly one micrometer. We propose that this long-range behavior may arise from a dual-scale mechanism: indirect RKKY-type exchange through the graphene layer, combined with strong local anisotropy from the CoO shells, which pins the magnetization of individual Co cores via exchange bias. These interpretations are presented as plausible hypotheses, and further experimental verification is required.