In this study hybrid structures were created by deposition of the graphene oxide and reduced on porous silicon layer. The charge transport relaxation processes in obtained analyzed basis comprehensive studies conductivity depolarization current 90–325 K temperature range within model disordered semiconductors. Hopping activation mechanism different ranges established energy was determined. Localized electron states that affect silicon/graphene-based found means thermally stimulated...

Systematic evaluation of the influence radiation on electrical response hybrid nanocomposites obtained by adding multi-walled carbon nanotubes into poly(3,4-ethylenedioxythiophene) and poly(styrenesulfonate) host matrix is presented. Variations resistance conductivity depending volume fraction in matrix, ionizing dosage, temperature are analyzed.

In this work, we have prepared film sensor elements based on a hybrid system poly(3,4-ethylenedioxythiophene)-porous silicon nanocrystals-carbon nanotubes flexible polymer substrates. Our FTIR spectroscopy-based studies for the molecular structure of materials obtained suggest some interaction their components in layer. The influence adsorption water molecules conductivity and capacitance composites has been investigated temperature range 20°C to 40°C. We detected essential changes...

We studied an effect of the graphene oxide (GO) layer on optical and electrical properties porous silicon (PS) in hybrid PS-GO structure created by electrochemical etching wafer deposition GO from water dispersion PS. With help scanning electron microscopy (SEM), atomic-force (AFM), Fourier transform infrared (FTIR) spectroscopy, it was established that formed a thin film PS surface is partly embedded pores A comparative analysis FTIR spectra for structures confirms passivation film. This...

In this work, the hybrid structures were created by electrochemical etching of silicon wafer and deposition reduced graphene oxide (RGO) on porous (PS) layer. With help SEM AFM, formation PS–RGO structure was confirmed. By means current–voltage characteristic analysis impedance spectroscopy, we studied electrical characteristics structures. The photosensitive barriers in revealed. Temporal parameters spectral photoresponse 400–1100-nm wavelength range investigated. widening photosensitivity...

Using photoluminescence and infrared spectroscopy techniques, we have investigated the influence of surface molecular composition porous silicon (PS) on character its spectra.The main absorption bands PS in spectral range are found to be caused by hydride passivation nanocrystals, adsorption water molecules hydroxyl groups during process formation, as well oxygen carbon due oxidation PS.Additional for PS-polyaniline composites oscillations that make up structural polymer chains.The physical...

The composition of the surface and electrical properties silicon oxide nanocomposites porous were investigated by FTIR spectroscopy in range 400 – 4000 cm -1 impedance frequency 25 Hz 1 MHz. It was revealed different dispersion capacitance bands complex relaxation processes that affect transport nanocomposites. correlations between IR absorption spectra composites charge transfer defined. On basis analysis thermal stimulated depolarization it shown oxidation nanocrystals gives rise to...

In this study, the analytical system for processing Ukrainian and Russian texts automatically detecting fake news was developed. The effectiveness of text message classification using naive Bayes classifier, support vector machine, k -nearest neighbors, random forest logistic regression methods studied. It has been established that adding to feature number positive negative words, tone, aggression presence makes it possible increase accuracy developed machine learning models. demonstrate...

The field-effect transistors (FETs) based on reduced graphene oxide (rGO) with SiO2, porous silicon (PS), and oxidized (PSox) supporting layers were obtained. influence of charged impurities in the substrate electrically active defects support electrical properties FETs was studied capacitance-voltage characteristic analysis. Localized electron states PS, PSox that affect charge transfer rGO-based determined using thermally stimulated depolarization spectroscopy. mechanisms various...

The photosensitive hybrid structures poly-3,4-ethylenedioxythiophene (PEDOT)– porous silicon (PS)–n-Si are fabricated. Current-voltage characteristics of the obtained investigated. It is shown that PS surface modification by PEDOT conjugated polymer gives rise to appearance a pronounced rectifying effect on current-voltage characteristics. Spectral photoresponse in 450–1100 nm wavelength range, its temperature dependence 125–325 K and energy photovoltaic studied. We propose possible...

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In this study, we have manufactured sensory films based on poly(3,4-ethylenedioxythiophene)/carbon nanotubes/reduced graphene oxide nanocomposite. The charge transport in obtained was analyzed using impedance spectroscopy and temperature dependence of conductivity the 90–325 K range. activation mechanism transfer established energy determined. percolation effect nanocomposite found with increasing content carbon nanoparticles. A decrease resistance an increase capacity hybrid due to...

Systematic evaluation of the influence simultaneous β- and γ-radiation from radium isotope on electrical photoluminescent response hybrid nanocomposites obtained by adding porous silicon nanoparticles into poly(3,4-ethylenedioxythiophene) doped poly(styrenesulfonate) host matrix is presented. It was found decrease in photoluminescence intensity increasing conductivity film because radiation exposure. Radiation-induced changes occur polymer as well PS contributing simultaneously to total...

The effect of the external electric field 105 V/m on ordering two luminescent liquid crystalline molecules (1-pentyl-2/,3/-difluoro-3///-methyl-4////-octyl-p-quinguephenyl and 9,10-Bis (4-pentylphenylethynyl)antracene) during thermal vacuum deposition is studied. morphology, electrical conductivity, optical absorption, luminescence spectra, polarization are presented analyzed. All data show formation ordered films. degree 60% for...

The hybrid layer based on poly-3,4-ethylene-dioxythiophene(PEDOT)-multi-walled carbon nanotubes (CNTs) the flexible polymer substrate is proposed as sensitive element to creation of humidity sensor. current-voltage characteristics obtained films have been studied. It shown that increasing content in composite leads decreasing resistance films. Increased electrical nanocomposite under influence moisture was manifested. To determine work future device a sensing ability polymer-CNTs function...

Abstract Effect of the polymer coating on structure and luminescent properties hybrid layer nanoporous silicon (PS)-polyparaphenylene (PPP) has been studied. For preparation PS a wafer with n-type conductivity was used. The PS-PPP structures were characterized by FTIR spectroscopy, scanning electron microscopy investigated ability to photo- cathodoluminescence at T= 78 293 K. It found that intensity luminescence in based PPP significantly increases as compared without polymer. possible...