A5050731423- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Graphene research and applications
- Advanced Chemical Sensor Technologies
- Electrochemical sensors and biosensors
- Transition Metal Oxide Nanomaterials
- Conducting polymers and applications
- ZnO doping and properties
- Advanced Sensor and Energy Harvesting Materials
- Advanced biosensing and bioanalysis techniques
- Advanced Nanomaterials in Catalysis
- Gold and Silver Nanoparticles Synthesis and Applications
- Electrochemical Analysis and Applications
- Graphene and Nanomaterials Applications
- Carbon Nanotubes in Composites
- Acoustic Wave Phenomena Research
- Neuroscience and Neural Engineering
- Nanowire Synthesis and Applications
- Metal and Thin Film Mechanics
- Nanofabrication and Lithography Techniques
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Microfluidic and Capillary Electrophoresis Applications
- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
National Institute for Research and Development in Microtechnologies
2012-2025
University of Bucharest
2019
The present communication reports on the effect of sprayed solution volume variation (as a thickness element) detailed Raman spectroscopy for WO3 thin films with different thicknesses grown from precursor solutions two concentrations. Walls-like structured monoclinic were obtained by spray deposition method further integration in gas sensors. A analysis series samples shows that increase strongly affects films’ morphology, while their crystalline structure is only slightly affected....
The development of materials offering electromagnetic interference (EMI) shielding is significant consideration, since this can help in expanding the lifetime devices, compatibility, as well protection biological systems. Conductive paints used widely today applications are often based on organic solvents that create safety issues due to subsequent environment problems. This paper concerned eco-friendly conductive water-based for use EMI-shielding applications. Graphene nanoplatelets,...
This study presents a novel methodology for the rapid on-site detection of tannic acid (TA), prevalent organic contaminant in various natural environments, notably plant-derived sources. The proposed approach involves development compact integrated electrochemical sensor incorporating nanozyme system. Specifically, this system comprises Fe2O3 nanoparticles (NPs) embedded within chitosan (CS) matrix, immobilized onto sulfur-doped graphene (S-Gr) substrate deposited on gold electrode (AuE)....
The present work regards a unique yet study of 3D structured surface evolution nano-balls and walls-like features with thickness variation, for tungsten oxide (WO3) thin films made by spray deposition. Since in most optoelectronic applications the morphology structure play crucial role WO3 is one studied used metal semiconductors significant variety applications, detailed recently observed reported complex architecture coatings fabricated pyrolysis (starting from different precursors) great...
The study presents the ethanol vapor sensing performance of a resistive sensor that utilizes quaternary nanohybrid layer composed holey carbon nanohorns (CNHox), graphene oxide (GO), SnO2, and polyvinylpyrrolidone (PVP) in an equal mass ratio 1:1:1:1 (w/w/w/w). device includes flexible polyimide substrate interdigital transducer (IDT)-like electrodes. film is deposited by drop-casting on structure. morphology composition sensitive are analyzed using scanning electron microscopy (SEM), Energy...
This paper reports several preliminary investigations concerning the relative humidity (RH) detection response of a chemiresistive sensor that uses novel sensing layer based on pristine carbon nano-onions (CNOs) and polyvinyl alcohol (PVA) at 1/1 2/1 w/w ratio. The device, including Si/SiO2 substrate gold electrodes, is obtained by depositing CNOs-PVA aqueous suspension structure drop casting. composition morphology film are explored mean Scanning Electron Microscopy, Raman spectroscopy,...
In recent years, field-effect transistors (FETs) based on graphene have attracted significant interest due to their unique electrical properties and potential for biosensing molecular detection applications. This study uses FETs with a nanocrystalline graphite (NCG) channel detect DNA nucleobases. The exceptional electronic of NCG, its high surface area, enable strong π–π stacking interactions nucleobases, promoting efficient adsorption stabilization the biomolecules. direct attachment...
WO3 nanostructured thin films were grown using spray deposition on FTO coated glass. The effect of the precursor concentration and solution quantity, which determines time, electrochemical, electrochromic optical properties was investigated. found to exhibit a good activity with reasonably durability charge exchange modulation under harsh electrochemical cycling in Li-ion-conducting electrolyte. Associated compositional structural characteristics probed by several techniques, indicating that...
This study presents relative humidity (RH) sensing response of resistive sensors composed nanocomposites with oxidized single-wall carbon nanohorns (SWCNHs) and hydrophilic polymers in different ratios at room temperature. The poly(ethylene glycol)-blockpoly(propylene glycol)-block-poly(ethylene glycol) (PEG-PPG-PEG) polyvinylpyrrolidone (PVP) materials were selected to be the polymers. Two types PVP synthesized, one using SWCNHs/VP 1/2 (w/w) ratio another SWCNHs/PVP a 1/1 ratio. structure...
The incorporation of graphene nanoplatelets (GnPs) within a polymer matrix can play an important role in the physical properties and functionality composite material. Composites consisting low-density polyethylene (LDPE) GnPs different concentrations were developed by mixing with molten form polymeric matrix. effect content on morphological, structural, electrical composites investigated. As shown, presence its concentration significantly modified properties, behavior that be employed for...
Graphene nanoplatelets (GNPs) and multiwall carbon nanotubes (CNTs)-polypropylene (PP) composite materials for electromagnetic interference (EMI) shielding applications were fabricated as 1 mm thick panels their properties studied. Structural morphologic characterization indicated that the obtained are not simple physical mixtures of these components but new with particular properties, filler concentration nature affecting nanomaterials' structure conductivity. In case GNPs, characteristics...
Organic–inorganic ternary nanohybrids consisting of oxidized-single walled carbon nanohorns-SnO2-polyvinylpyrrolidone (ox-SWCNH/SnO2/PVP) with stoichiometry 1/1/1 and 2/1/1 ox-SWCNH/ZnO/PVP = 5/2/1 5/3/2 (all mass ratios) were synthesized characterized as sensing films chemiresistive test structures for ethanol vapor detection in dry air, the range from 0 up to 50 mg/L. All had an ox-SWCNH concentration 33.3–62.5 wt%. A comparison between transfer functions response recovery times these...
This paper reports, for the first time, on electrical percolation threshold in oxidized carbon nanohorns (CNHox)-polyvinylpyrrolidone (PVP) films. We demonstrate-starting from design and synthesis of layers-how these films can be used as sensing layers resistive relative humidity sensors. The morphology composition are investigated through Scanning Electron Microscopy (SEM), Atomic Force (AFM), RAMAN spectroscopy. For establishing thresholds CNHox PVP, nanocomposite thin were deposited...
The present manuscript reports on optimized formulations of alcohol-based conductive paints for electromagnetic interference shielding (EMI), which can ensure compatibility and reduce the visibility electronic equipment, as a continuation our previous work in this field, examined water-based other applications. Graphite, carbon black, graphene, Fe3O4, Fe ore, PEDOT:PSS various ratios combinations were employed an alcohol base developing homogeneous paint-like fluid mixtures that could be...
We report the relative humidity (R.H.) sensing response of a resistive sensor, employing layers based on ternary nanohybrid comprising holey carbon nanohorns (CNHox), potassium chloride (KCl), and polyvinylpyrrolidone (PVP) at mass ratios 7/1/2, 6.5/1.5/2, 6/2/2 (w/w/w/w). The structure comprises silicon substrate, SiO2 layer, interdigitated transducer (IDT) electrodes. film is deposited via drop-casting method. layers' morphology composition are investigated through Scanning...
Herein, the correlation between texture coefficient and electrochromism in vanadium pentoxide nanostructured films with orthorhombic symmetry obtained by spray pyrolysis technique is reported. From a microstructural point of view, X‐ray diffraction depicts that size crystalline domains, evaluated from both Scherrer equation Rietveld refinement, depends on coefficient, which further implies dislocation density related to coefficient. applications high found facilitate insertion charge, thus...
Sensor systems for monitoring indoor air quality are vital the precise quantification of mechanisms which lead to deterioration human health, with a typical person spending an average 20 h day in enclosed space. Thus, series layered chemoresistive sensors, obtained by facile electrodeposition carbon nanomaterial-enhanced PANI composites, have been tested selective detection two core pollutants: ammonia and nitrogen dioxide. The sensors were respect sensitivity selectivity target gasses,...
In this paper, we report the use of natural extract Echinacea leaves [Echinacea purples] for biosynthesis copper oxide nanoparticles, with nitrate [Cu(NO3)2 3H2O] used as a metal precursor salt. The synthesized CuO was investigated using Fourier transform infrared spectrometry (FTIR), Raman spectroscopy, X-ray diffraction, scanning electron microscopy (FESEM), and energy dispersive analysis (EDX). FTIR spectra confirm not only presence Cu-O bond by appearance characteristic peak at 402 cm−1,...