controlled synthesis and gas sensing properties of hollow sea urchin like
controlled synthesis and gas sensing properties of hollow sea urchin like
... Sensors and Actuators B 141 (2009) 381–389is one of the most important parameters of sensors. In addition, the sensing properties of hollow sea urchin- like ␣-Fe2O3nanostruc-tures and ␣-Fe2O3nanocubes ... 2009Keywords:␣-Fe2O3 Hollow sea urchin- like nanostructureNanocubes Gas sensorsabstract Hollow sea urchin- like ␣-Fe2O3nanostructures were successfully synthesized by a hydrothermalapproach using FeCl3 and ... thebest of our knowledge, this is the first report of the selective synthesis of ␣-Fe2O3superstructures and nanocubes. The gas- sensing properties of the ␣-Fe2O3superstructures, nanocubes and nanoparticle...
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glucose - mediated hydrothermal synthesis and gas sensing characteristics of wo3 hollow microspheres
... achieveboth of high surface area and large pore volume.3.4. Gas sensing characteristicsAs stated above, the gas responses of the R5 and R0.5 powderswere negligible. Thus, the gas responses of the ... theeffective gas diffusion (Fig. 5). The gas response was improved fur-Fig. 7. Dynamic sensing transients of (a) R30-RH and (b) R30 sensors and (c) gas responses (Rg/Ra) of R30-RH and R30 sensors ... by the gas sensing reaction.In contrast, a hollow morphology with a thin shell configuration and large pore volume facilitates the in-diffusion of the sensing gas and counter-diffusion of the...
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electrical and gas - sensing properties of wo3 semiconductor material
... concentration of NOx gas [6]. However,most reports focused on the NOx gas sensors, and thestudy of sensing to other gases was rare. In this paper,we have investigated the electrical and gas- sensing characteristics ... sensors to certain control and monitoring.3.3. Gas- sensing properties In this study, we ®rst examined the eect of calciningtemperature on gas- sensing properties of sensor. It wasfound that ... 0.6±0.8mm.2.4. Measurement of sensing properties The gas- sensing properties were examined in achamber through which air or a sample gas (petrol,methane, butane and ethanol diluted with air)...
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large - scale synthesis and gas sensing application of vertically
... species and make them excellent candidatesfor gas sensing applications [34,35]. The gas sensing performanceX. Shen et al. / Sensors and Actuators B 143 (2009) 325–332 329Fig. 4. TEM and HRTEM ... absorp-tion band gap energy. Two regions with a linear relationship areobserved in the ranges of 3.5–4.2eV and 5.0–6.0 eV, respectively,giving two Egvalues of 2.77 eV and 2.26eV. The band gap of 2.77 ... conductionband). However, the band gap of 2.77 eV is much lower than thereported directband gapsof WO3. Theband edgeposition for amor-phous WO3in contact with an aqueous electrolyte at a pH of...
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thermal treatment effects on the material and gas-sensing properties of room-temperaturetungstenoxidenanorodsensors
... the material and gas- sensing properties of room-temperature tungsten oxide nanorod sensorsYong Shin Kim∗Department of Applied Chemistry, Hanyang University, Ansan 426-791, Republic of Koreaarticle ... by drop-coatingsingle-crystalline, size -controlled WO2.72nanorod solution, and then investigated the dependence of their material and gas- sensing properties on thermal treatment conditions. ... depositions of 5 nm Cr and 100 nm Au layers througha shadow metal mask. It possesses two interdigitated Au elec-trodes with a sensing area of 3 mm × 10 mm and an electrode gap of 300 m. Sensing...
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gas - sensing properties of tin oxide doped with metal oxides and carbon
... press as: N. Van Hieu, et al., Gas- sensing properties of tin oxide doped with metal oxides and carbon nanotubes:A competitive sensor for ethanol and liquid petroleum gas, Sens. Actuators B: Chem. ... press as: N. Van Hieu, et al., Gas- sensing properties of tin oxide doped with metal oxides and carbon nanotubes:A competitive sensor for ethanol and liquid petroleum gas, Sens. Actuators B: Chem. ... have already investigated the gas- sensing properties of blank SnO2films heat-treated at thesetemperatures, and we have obtained similar responses to ethanol gas and LPG (not shown here). Therefore,...
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gas sensing properties of metal - organics derived pt dispersed - tio2 thin film fired in nh3
... et al.rSensors and Actuators B 67 2000 270–274 271Fig. 1. Change of gas sensitivity with firing temperature.This paper described the effect of NH on gas sensing 3 properties of Pt dispersed-TiO ... highest gas sensitivity and selectivity toH among reducing gases: H , CO and CH . A XRD224profile of this thin film indicated the presence of onlyanatase phase. In contrast, the sensitivities of ... of firing temperature. The gas sensitivities to 1000 ppm CO and CH were very low and independent of the firing4temperature in the range of 4008C–5508C. In contrast, the gas sensitivity to 1000...
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gas sensing properties of nanocrystalline tungsten oxide synthesized by acid
... calcinations are in the range of 30–150 nm.The gas sensing properties of these powders in the form of thick film were investigated with and withoutplatinum doping. Gas response of thick films sintered ... No. of Pages 5Sensors and Actuators B xxx (2010) xxx–xxxContents lists available at ScienceDirectSensors and Actuators B: Chemicaljournal homepage: www.elsevier.com/locate/snb Gas sensing properties ... achieveimprovements in the gas sensing properties such as enhancing their response, selectiv-ity to a given target species and reduce the operating temperature,small amounts of noble metals (Pt, Pd and Ag) are...
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gas sensing properties of nanoparticle indium - doped wo3 thick films
... the band gap of the In-loaded WO3. These energetic levels are the source of addedsupport of charge that changes the sensing properties of theWO3-based sensors.4. ConclusionsThe gas sensing ... size of active layers is one of the key factors toenhance the gas sensing properties of semiconductor metaloxide sensors [7,8]. Additionally, the inclusion of differ-ent doping metals in the sensing ... commercialWO3nanopowders and powder mixtures with different concentrations of In (1.5, 3.0 and 5.0wt.%). The gas sensing properties of the sensorsto nitrogen dioxide, carbon monoxide, ammonia and ethanol...
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gas sensing properties of wo3 doped rutile tio2 thick film at high operating temperature
... oxidizing gases, CO, O2 and CO2, at 600 °C, and a gas mixture (NO2+ oxidizing gases) with CO, O2 and CO2concen-trations of 1000 ppm, 15% and 10%, respectively. The detection re-sults of the ... oxidizing gases and the gas mixture are shown in Figs. 6 and 7.InFig. 6, sensitivities of the sensor (15 wt.% WO3doped TiO2) to CO, O2 and CO2werevery small. And in Fig. 7, the resistance of ... topography and inner morphological properties of the sensing film were characterized with scanning electronmicroscopy (SEM), atomic force microscopy (AFM) and X-ray diffraction (XRD). The gas sensing...
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