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showing 10 items of 2320 documents

Effects of anion size on the electrochemical behavior of H2SO4-structured poly(o-toluidine) films. An ac-electrogravimetry study in acid solutions

2014

International audience; ac -Electrogravimetry has allowed an easy separation of kinetic information to be evaluated for all the transferred species in three different H2SO4-structured poly(o-toluidine) or POT films, View the MathML sourcePOT-NO3−, View the MathML sourcePOT-ClO4− and POT-Cl− films when they are polarized between the pernigraniline (oxidized) and leucoemeraldine (reduced) forms. It is clear that larger anions slow down the electrochemical transitions of POT films, but the effects of anion transfer on hydrated protons and free solvent transfers are affected. For the same polymeric structure of a POT film, the kinetics of all specie transfers have been evaluated considering the…

Materials scienceGeneral Chemical EngineeringKineticsInorganic chemistryAnalytical chemistry02 engineering and technology010402 general chemistryElectrochemistry01 natural sciencesac-ElectrogravimetryOxidation stateElectrogravimetryElectrochemistryMoleculeElectrochemical quartz crystal microbalance[CHIM]Chemical Scienceschemistry.chemical_classificationac-Electrogravimetry.Polymer021001 nanoscience & nanotechnology0104 chemical sciencesDielectric spectroscopySolventchemistryIntrinsically conducting polymer0210 nano-technology[CHIM.OTHE]Chemical Sciences/OtherElectrochemical impedance spectroscopyPoly(o-toluidine)
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Luminescence properties of KNbO3 crystals

1997

Thermostimulated luminescence, X-ray-induced luminescence, photostimulated luminescence as well as the time-resolved luminescence and absorption after pulsed electron beam irradiation were studied in KNbO3 crystals at 80–400 K. A correlation between defects causing the luminescence and blue-light-induced IR absorption effects supressing the second harmonic generation efficiency in KNbO3 is discussed.

Materials scienceIr absorptionOptically stimulated luminescencebusiness.industryPhotostimulated luminescenceBiophysicsSecond-harmonic generationGeneral ChemistryCondensed Matter PhysicsBiochemistryAtomic and Molecular Physics and OpticsElectron beam irradiationOptoelectronicsTime-resolved spectroscopyLuminescencebusinessAbsorption (electromagnetic radiation)Journal of Luminescence
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Unconventional optically active solids in san jose

1990

Materials scienceMechanics of Materialsbusiness.industryMechanical EngineeringOptoelectronicsGeneral Materials ScienceOptically activebusinessAdvanced Materials
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Characterization of microscopic ferromagnetic defects in thin films using magnetic microscope based on Nitrogen-Vacancy centres

2020

In this work we present results acquired by applying magnetic field imaging technique based on Nitrogen-Vacancy centres in diamond crystal for characterization of magnetic thin films defects. We used the constructed wide-field magnetic microscope for measurements of two kinds of magnetic defects in thin films. One family of defects under study was a result of non-optimal thin film growth conditions. The magnetic field maps of several regions of the thin films created under very similar conditions to previously published research revealed microscopic impurity islands of ferromagnetic defects, that potentially could disturb the magnetic properties of the surface. The second part of the measur…

Materials scienceMicroscopeFOS: Physical sciencesApplied Physics (physics.app-ph)02 engineering and technology010402 general chemistry01 natural scienceslaw.inventionMagnetic field imaginglawVacancy defectDeposition (phase transition)General Materials ScienceThin filmCondensed matter physicsPhysics - Applied Physicsequipment and supplies021001 nanoscience & nanotechnologyCondensed Matter PhysicsWide-field magnetic microscopy; Ferromagnetic thin film; Surface defect characterization; Optically detected magnetic resonance; Nitrogen-vacancy centres in diamond0104 chemical sciencesMagnetic fieldCharacterization (materials science)Ferromagnetism0210 nano-technologyDen kondenserade materiens fysikhuman activitiesMaterials Chemistry and Physics
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Raman Spectra of ZrS2 and ZrSe2 from Bulk to Atomically Thin Layers

2016

In the race towards two-dimensional electronic and optoelectronic devices, semiconducting transition metal dichalcogenides (TMDCs) from group VIB have been intensively studied in recent years due to the indirect to direct band-gap transition from bulk to the monolayer. However, new materials still need to be explored. For example, semiconducting TMDCs from group IVB have been predicted to have larger mobilities than their counterparts from group VIB in the monolayer limit. In this work we report the mechanical exfoliation of ZrX2 (X = S, Se) from bulk down to the monolayer and we study the dimensionality dependence of the Raman spectra in ambient conditions. We observe Raman signal from bul…

Materials scienceNanotechnology02 engineering and technology010402 general chemistrylcsh:Technology01 natural sciencesSignallcsh:Chemistrysymbols.namesakeTransition metalMonolayerGeneral Materials Sciencelcsh:QH301-705.5InstrumentationFluid Flow and Transfer ProcessesThin layerslcsh:Tbusiness.industryProcess Chemistry and TechnologyBilayertransition metal dichalcogenidesGeneral Engineering2D materialsexfoliation021001 nanoscience & nanotechnologyExfoliation jointlcsh:QC1-9990104 chemical sciencesComputer Science ApplicationsEspectroscòpia RamanSemiconductorlcsh:Biology (General)lcsh:QD1-999Semiconductorslcsh:TA1-2040Chemical physicsRaman spectroscopysymbolsAtomically-thin layerslcsh:Engineering (General). Civil engineering (General)0210 nano-technologybusinessRaman spectroscopylcsh:Physics
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Review on Polymers for Thermoelectric Applications.

2014

In this review, we report the state-of-the-art of polymers in thermoelectricity. Classically, a number of inorganic compounds have been considered as the best thermoelectric materials. Since the prediction of the improvement of the figure of merit by means of electronic confinement in 1993, it has been improved by a factor of 3-4. In the mean time, organic materials, in particular intrinsically conducting polymers, had been considered as competitors of classical thermoelectrics, since their figure of merit has been improved several orders of magnitude in the last few years. We review here the evolution of the figure of merit or the power factor during the last years, and the best candidates…

Materials scienceNanotechnologyReviewlcsh:TechnologyThermoelectric effectnanocompositesintrinsically conducting polymersFigure of meritGeneral Materials ScienceOrders of magnitude (data)lcsh:Microscopylcsh:QC120-168.85chemistry.chemical_classificationConductive polymerlcsh:QH201-278.5lcsh:TPolymerThermoelectric materialschemistrylcsh:TA1-2040Inorganic materialslcsh:Descriptive and experimental mechanicslcsh:Electrical engineering. Electronics. Nuclear engineeringlcsh:Engineering (General). Civil engineering (General)lcsh:TK1-9971thermoelectricsMaterials (Basel, Switzerland)
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<title>Use of AlN ceramics in ultraviolet radiation dosimetry</title>

2003

AlN-Y2O3 ceramics is studied as a material for application in the area of ultraviolet radiation (UVR) dosimetry. The properties of optically stimulated luminescence (OSL) and thermally stimulated luminescence (TL) revealed by AlN ceramics are characterized and considered for practical application. A special attention is devoted to studies of the spectral properties of the material, including stimulated luminescence. Spectral properties of the material make it potentially suitable for dosimetric application both in UV-C region (200-290 nm), where it has the maximum sensitivity, and in UV-B+UV-A (290-350 nm) region, where the spectral behavior of its sensitivity coincides rather well with tha…

Materials scienceOptically stimulated luminescencebusiness.industryOptical engineeringSpectral propertiesvisual_artvisual_art.visual_art_mediumOptoelectronicsDosimetryCeramicbusinessLuminescenceSensitivity (electronics)Ultraviolet radiationSPIE Proceedings
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Performance data of optically stimulable irradiated materials (doped alkali halides) oriented for imaging and dosimetry purposes

1997

Performance characteristics of a doped alkali halide (KBr:In)-based imaging plate (IP) and dosemeter (D) both the devices utilizing optically stimulated luminescence (OSL) and suitable for UV-light and x-ray energy recording are described. By exploiting (silicon) photodiode array as a photodetector, the detective quantum efficiency of 0.1 for IP (KBr:In) can be achieved. A very wide dynamic range, 1010:1 for UV (6.35 eV) and 1011:1 for x-ray (44 kV tube voltage) OSL recording at the spatial resolution of 1 mm2, is favorable for digital imaging and considerably improves image quality. These possibilities are illustrated by presenting available information capacities, energy consumption per b…

Materials scienceOptically stimulated luminescencebusiness.industryPhotodetectorPhotodiodelaw.inventionDetective quantum efficiencyOpticslawWide dynamic rangeOptoelectronicsQuantum efficiencyContrast ratioLuminescencebusinessSPIE Proceedings
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Luminescence of natural α-quartz crystal with aluminum, alkali and noble ions impurities

2019

This work was supported by the Latvian Science Council Grant No lzp-2018/1–0289 .

Materials sciencePhotoluminescenceOptically stimulated luminescenceTime resolved photoluminescenceBiophysicsAnalytical chemistrychemistry.chemical_element010502 geochemistry & geophysicsThermal quenching01 natural sciencesBiochemistryIonα-quartz0103 physical sciences:NATURAL SCIENCES:Physics [Research Subject Categories]Spontaneous emissionAluminum-one-valence ions complex0105 earth and related environmental sciences010302 applied physicsCondensed Matter - Materials ScienceGeneral ChemistryCondensed Matter PhysicsAlkali metalCopperAtomic and Molecular Physics and OpticschemistryAtomic electron transitionLuminescenceExcimer lasers
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UV light induced luminescence processes in AlN nanotips and ceramics

2005

UV induced luminescence properties of AlN (Eg = 6.2 eV) have been studied for AlN nanotips and AlN ceramics, using methods of photoluminescence, optically stimulated luminescence and thermoluminescence. In both types of objects the main luminescence band, which appears in prompt and stimulated emission spectra around 400 nm, arises due to presence of oxygen-related defects. The main difference between AlN nanotips and AlN ceramics is observed in excitation spectra and TL properties. Basing on the experimental results it is assumed that several different energy transfer mechanisms occur in AlN. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Materials sciencePhotoluminescenceOptically stimulated luminescencebusiness.industryThermoluminescenceSpectral linevisual_artLight inducedvisual_art.visual_art_mediumOptoelectronicsStimulated emissionCeramicLuminescencebusinessphysica status solidi (c)
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