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wo3 thin film sensor prepared by sol–gel technique and its low-temperature sensing properties to trimethylamine
wo3 thin film sensor prepared by sol–gel technique and its low-temperature sensing properties to trimethylamine
. Materials Chemistry and Physics 69 (2001) 176–179WO3 thin film sensor prepared by sol–gel technique and its low-temperature sensing properties to trimethylamine Maosong Tong, Guorui Dai∗,. sensing characteristics of the thin film sensor to trimethylamine were measured. A low-temperature, high sensitivity, excellent selectivity, quick response and recover of thin film sensors to trimethylamine. WO3 thin film sensor prepared by a sol–gel Fig. 5. The relationship between the gas sensitivity and operating tem-perature to different gases at the same concentration of 1000 ppm and to water...
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Silicon quantum wires arrays synthesized by chemical vapor deposition and its micro structural properties
... ofdefects near the tip of SiNWs prepared by othermethods, our present SiNWs with sharp tips and perfect lattices might be promising materials forfuture nanoprobes and superior field emitters.2. ... SiH4 and H2flows wereturned off, and the sample was cooled to roomtemperature in an Ar atmosphere.Before TEM characterization, the deposits onone side of the alumina membrane were removed by ... withthe pore surface and the atomic Si has absorbed and exchange energy and momentum with theatom, causing overcooling at the surface. Becausethe precipitation, nucleation and growth of SiNWsalways...
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Tài liệu Báo cáo " Survey of WO3 thin film structure built on ito/glass substrates by the Raman and xrd spectroscopies" doc
... 350nm clearly effects on the Raman and XRD spectrograms of WO3 films. Keywords: WO3 structure, WO3 /ITO/glass, Raman spectroscopy. 1. Introduction WO3 thin films have been studied for along ... structure between WO3 films and WO3 powder sample and between one film to another. These numbers show no difference in structure between WO3 powder and WO3 films. However, we could ... of WO3 thin films on ITO layers with thickness, altering from 300 to 350nm Figure 4 shows the Raman and XRD spectrum of WO3 films, deposited on 300 nm and 350 nm ITO layers and WO3...
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modeling of the conduction in a wo3 thin film as ozone sensor
. Ewis equal to 0.1 eV and 0.35 eV for oxygen dissociative and non-dissociative chemisorption, respectively and 1.2 eV forozone.4. Results and discussionThe stoichiometry, the grain size and the. by O2 and O3in the dissociative adsorption case.species O2,O2−, O or O−at 473 K and O or O−at 573 and 673 K) and ionized covering rate θ−(due to species O2−or O−at 473 K and. to the normal conditions of a sensor oper-ation,Fig. 4. (a) Total covering rate of adsorption sites induced both by O2 and O3inthe non-dissociative (at 473 K) and dissociative (at 573 and...
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sensitivity properties of a novel no2 gas sensor based on mesoporous wo3 thin film
. ofWO3 thin film gas sensors. Part 1. Thin film devices, sensors and actuators, Thin Solid Films 287 (1996) 258–265.[7] V. Demarne, A. Grisel, An integrated low-power thin film CO gassensors. semiconductorsurfaces are thought to be ONO−(nitrito type adsorbates) and dissociate into nitrosyl type adsorbates (NO+,NO−)[23]. This enables to conclude that the normal response of sensor. temperature and sensitivity ofthe sensor. Mesoporous materials are generally prepared by amphiphilic self-assembling surfactants as templates[14,15]. In this study, the mesoporous WO3 thin film sensorssynthesized...
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sensor response of sol–gel multiwalled carbon nanotubes-tio2 composites
. Pages 7Sensors and Actuators B xxx (2009) xxx–xxxContents lists available at ScienceDirectSensors and Actuators B: Chemicaljournal homepage: www.elsevier.com/locate/snb Sensor response of sol–gel. techniques, screen-printing and dip-coating, to cover non-conductiveglass substrates with TiO2:Multiwall Carbon Nanotubes (MWCNT), and its application as chemical sensorsare reported. A sol–gel. TiO2–MWCNT by dip-coating and annealingtechniquesTiO2 and TiO2–MWCNT composites thin films were prepared by the sol–gel dip-coating method using compositions similar to the ones described in Section...
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wet process-based fabrication of wo3 thin film for no2 detection
. which tends to grow into thin Fig. 1. SEM images (top and cross-sectional views) of WO3 thin films derived from WO3·2H2O sols (PEG 2mass%). WO3·2H2O content: (a) 1mass%,(b) and (c) 5 mass%.plates. NO2 sensing prop-erties at 200, 250 and 300◦C. Response and recoverytransients in electrical resistance to switching-on and -off100 and 500 ppb NO2are shown in Fig. 3. Response and recovery. mean thickness, was supplied to the subsequent gas sensing experiments.Y G. Choi et al. /Sensors and Actuators B 101 (2004) 107–111 109Fig. 2. Mean thickness of WO3 thin films derived from WO3·2H2O...
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analysis of cuo nanoparticles synthesized by sol gel
... indi-rect band gap due to the formation of surface defects. CuO nanoparticles on the other hand show higher direct band gap as compared to bulk value indicating blue shift of band gap due to the ... vs. photon energy, νh. Figure 4 and 5 show the variation of 1()nhαν vs. νh for CuO nanoparti-cles with n values of 1/2 and 2 respectively. The values of direct and indirect band gap ... pressed into pellets. Finally these pellets were annealed at 500℃ for 1 hour. The structural and optical properties of the CuO nanopar-ticles were studied by using Bruker X-ray diffractometer...
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analysis of cuo nanoparticles synthesized by sol gel
... indi-rect band gap due to the formation of surface defects. CuO nanoparticles on the other hand show higher direct band gap as compared to bulk value indicating blue shift of band gap due to the ... vs. photon energy, νh. Figure 4 and 5 show the variation of 1()nhαν vs. νh for CuO nanoparti-cles with n values of 1/2 and 2 respectively. The values of direct and indirect band gap ... pressed into pellets. Finally these pellets were annealed at 500℃ for 1 hour. The structural and optical properties of the CuO nanopar-ticles were studied by using Bruker X-ray diffractometer...
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