A5085265619- Conducting polymers and applications
- Carbon Nanotubes in Composites
- Electrochemical sensors and biosensors
- Graphene research and applications
- Organic Electronics and Photovoltaics
- Electrochemical Analysis and Applications
- Fullerene Chemistry and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Analytical Chemistry and Sensors
- Supercapacitor Materials and Fabrication
- Mechanical and Optical Resonators
- Perovskite Materials and Applications
- Diamond and Carbon-based Materials Research
- Chalcogenide Semiconductor Thin Films
- Polyoxometalates: Synthesis and Applications
- Polymer Nanocomposite Synthesis and Irradiation
- Graphene and Nanomaterials Applications
- Advanced Sensor and Energy Harvesting Materials
- Nanopore and Nanochannel Transport Studies
- Advanced Photocatalysis Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Semiconductor Detectors and Materials
- Dielectric materials and actuators
- Luminescence Properties of Advanced Materials
- Quantum Dots Synthesis And Properties
National Institute of Materials Physics
2016-2025
Center of Technology and Engineering for Nuclear Projects
2021
University of Bucharest
2015-2017
Institutul National de Cercetare si Dezvoltare pentru Fizica Pamantului
2016
Instituto de Óptica "Daza de Valdés"
2009
Institut de Ciència de Materials de Barcelona
2006-2007
Consejo Superior de Investigaciones Científicas
2006
Institut des Matériaux Jean Rouxel
2003-2005
Nantes Université
2004
Institut de Physique et Chimie des Matériaux de Strasbourg
2001
Using surface-enhanced Raman scattering (SERS) and Fourier transform infrared (FTIR) spectroscopy, we show that composites based on polyaniline (PANI) single-walled carbon nanotubes (SWNTs) are different when they prepared by two methods: (1) adding dispersed SWNTs to the polymer solutions (2) chemical polymerization of aniline in presence SWNTs. The difference originates from irreversible transformation medium. synthesis medium used for preparation PANI transforms into fragments shorter...
Surface enhanced Raman scattering (SERS) is being increasingly used for the study of structural properties conducting polymer thin films. It generally accepted that enhancement process has an electromagnetic origin, arising from excitation surface plasmons in metal support on which film deposited. However, also accompanied by a chemical process, available experimental data are scarce. The originates increase polarizability molecules at under action incident radiation, leads to formation new...
The combination of the unique properties carbon nanotubes (CNTs) with conjugated polymers makes their combined composite materials interesting as multifunctional systems great potential. Supercapacitors, lithium rechargeable batteries, sensors, photovoltaic cells and photodiodes, optical limiting devices, solar cells, high-resolution printable conductors, electromagnetic absorbers advanced transistors are among most promising applications. Knowledge molecular structure such compounds is...
Abstract Using UV-VIS absorption spectroscopy, photoluminescence (PL) and excitation (PLE), the photodegradation reactions of folic acid (FA) in phosphate buffer (PB) solutions were studied. Regardless PB solution’s pH, spectra showed a gradual decrease absorbance at 284 nm simultaneous with an increase another band spectral range 320–380 nm, which was downshifted under UV irradiation. The relative intensity FA PL band, situated 375–600 dependent on pH solution. increased as increasing...
The enhancement of the Raman scattering in Cs3Bi2I9 is evaluated by ratio IT/I300 K between relative intensities line peaked at 146 cm−1, when spectra are recorded temperature range 88–300 K, as a signature exciton–phonon interactions. In resonant and nonresonant conditions, excitation wavelengths 476, 561, 660 nm, respectively, used order to overlap with great accuracy bands disclosed diffuse reflection, photoconductivity (PC), photoluminescence (PL), (PLE) spectra. Based on experimental...
Recent progress concerning the development of counter electrode material (CE) from dye-sensitized solar cells (DSSCs) and (EM) within supercapacitors is reviewed. From composites based on carbon nanotubes (CNTs) conducting polymers (CPs) to their biggest competitor, namely graphene or derivate (GD) CPs, there are many methods synthesis that influence morphology functionalization inside composite, making them valuable candidates for EM both DSSCs in devices. combination CPs with carbon-based...
In this work, three methods for the synthesis of composites based on poly(ortho-toluidine) (POT) and WS2 are reported: (a) solid-state interaction (SSI) POT with nanoparticles (NPs); (b) in situ chemical polymerization (ICP) ortho-toluidine (OT); (c) electrochemical (ECP) OT. The preparation sheets was performed by ball milling NPs followed ultrasonication solvent N,N’-dimethyl formamide. During POT/WS2 SSI ICP, an additional exfoliation reported. we demonstrated following: ICP method leads...
Surface-enhanced Raman scattering (SERS) has proved to be an effective technique for studying the structural properties of conducting polymer thin films. The enhancement process a twofold origin, electromagnetic and chemical. enhancement, which is dominant mechanism in SERS generation, consists excitation localized delocalized surface plasmons (SPs) metallic support film. emission adsorbed molecules on metal (the most efficient being Ag, Au Cu) due intense evanescent field located at...
Scanning electron microscopy, Raman scattering, UV–VIS absorption spectroscopy and low temperature photoluminescence (PL) were used to examine small particles produced by the chemical reaction between Pb(NO3)2 KI in different liquid media: water, methanol, ethanol acetonitrile. By stoichiometric changes synthesis reaction, platelets of PbI2 rods probably KPbI3 are produced. Regardless shape size, these exhibit almost same PL, which consists two intense bands centred around 2.5 (E band) 2.0...
Through correlated studies using scanning electron microscopy (SEM), Raman spectroscopy and low-temperature photoluminescence (PL) we have demonstrated that the intercalated PbI2 with ammonia, poly (vinyl alcohol) polyacrylamide are characterized by a distinctive signature in spectra. After intercalation, spectrum of reveals an orthorhombic structure, identical observed on micrometric scale, KPbI3 rod-like particles resulting from reaction between Pb(NO3)2 KI, carried out liquid media such...
Abstract Electrochemical polymerization of N‐vinyl carbazole (VC) on carbon nanotube (CNT) films was studied by cyclic voltammetry (CV) in LiClO 4 /acetonitrile solutions. Comparing the voltammograms recorded a blank Pt electrode with those obtained when single‐ or multi‐walled (SWNT MWNT) were previously deposited onto electrode, downshift VC reduction peak potential is observed latter case. The influences monomer concentration, type solvent, and supporting electrolyte conditions...
Abstract Carbon nanowalls (CNWs) functionalization allows the tailoring of some their properties after they have been synthesized. Herewith we report on post‐synthesis CNWs by plasma treatments. Radiofrequency plasmas generated in hydrogen, oxygen, nitrogen, tetrafluoroethane, and sulfur hexafluoride admixed to argon, were used. The changes morphology, structure, chemical composition determined SEM, FTIR, Raman Spectroscopy, specifically for each gas mixture. results point out surface...