electrical and gas - sensing properties of wo3 semiconductor material

... Electrical and gas- sensing properties of WO3 semiconductor material Wang Yu-De*, Chen Zhan-Xian, Li Yan-Feng, Zhou Zhen-Lai, Wu Xing-HuiDepartment of Materials Science and Engineering, ... sensors to certain control and monitoring.3.3. Gas- sensing properties In this study, we ®rst examined the eect of calciningtemperature on gas- sensing properties of sensor. It wasfound that ... this paper,we have investigated the electrical and gas- sensing characteristics of WO3 semiconductor material to othergases such as ethanol, petrol, butane and methane. Theexperimental results...

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 ... The surface and morphological properties of the fabricated sensor were studied, while its gas sensing properties were investigated by detecting NO2 and otheroxidizing gases (CO, O2 and CO2) ... reserved.1. Introduction Semiconductor gas sensors can detect oxidizing and reducinggases by measuring the conductance changes in the surface phe-nomena in terms of gas adsorption and desorption [1,2]....

glucose - mediated hydrothermal synthesis and gas sensing characteristics of wo3 hollow microspheres

... 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 ... hydrothermal synthesis and gas sensing characteristics of WO3hollow microspheresChoong-Yong Lee, Sun-Jung Kim, In-Sung Hwang, Jong-Heun Lee∗Department of Materials Science and Engineering, Korea ... preparedby one-pot hydrothermal reaction and their gas sensing char-acteristics are investigated. The study focuses on the formationmechanism of tungsten-precursor-coated carbon spheres and hol-low...

thermal treatment effects on the material and gas-sensing properties of room-temperaturetungstenoxidenanorodsensors

... tungsten oxide ﬁlms by drop-coatingsingle-crystalline, size-controlled WO2.72nanorod solution, and then investigated the dependence of their material and gas- sensing properties on thermal treatment ... the material and gas- sensing properties of room-temperature tungsten oxide nanorod sensorsYong Shin Kim∗Department of Applied Chemistry, Hanyang University, Ansan 42 6-7 91, Republic of Koreaarticle ... oxide semiconductors (MOS) have been utilized as gas- sensing active materials for half a century [1,2]. One of the mostpromising solid-state MOS chemosensors is a tungsten oxide-based gas sensor....

controlled synthesis and gas sensing properties of hollow sea urchin like

... thebest of our knowledge, this is the ﬁrst report of the selectivesynthesis of ␣-Fe2O3superstructures and nanocubes. The gas- sensing properties of the ␣-Fe2O3superstructures, nanocubes and nanoparticle ... 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 ... ␣-Fe2O3nanostructures (- -) , nanocubes (- -) and nanoparticle aggregations (- -) sensors versus the logarithm of ammonia, formaldehyde, triethylamine, acetone and ethanol concentration at 350◦C and relativehumidity...

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 ... Reduc-ing the grain 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 ... SpainbDepartment of Microelectronics, Technical University of Brno, 60200 Brno, Czech RepublicAvailable online 11 August 2005AbstractThe gas sensing properties of pure and indium-doped nanoparticle...

gas - sensing properties of tin oxide doped with metal oxides and carbon

... Research Pro-gram for Materials Technology (Project No. KC 0 2-0 5/0 6-1 0), theresearch projects of Vietnam Ministry of Education and Training(Code B200 8-0 1-2 17 and B200 8-2 1-0 9) and Key basic ... response time for gas exposure (t90%(air-to -gas) ) and thatfor recovery (t90% (gas- to-air)) were calculated from the resistance-time data shown in Fig. 3d. The t90%(air-to -gas) values are ... and out of the gas molecules.To study the effect of MWCNTs doping on the sensing proper-ties to ethanol gas and LPG, we plotted the response of undopedSnO2sensor to 250 ppm ethanol gas and...

ethanol and ozone sensing characteristics of wo3 based sensors activated by au and pd

... Idrissi, Electrical and optical properties of WO3thin ﬁlms, Thin SolidFilms 397 (2001) 238–243.[8] W. Yu-De, C. Zhan-Xian, L. Yan-Feng, Z. Zhen-Lai, W. Xing-Hui, Electri-cal and gas- sensing properties ... Au/WO3 and Pd/WO3at Twork= 300◦C, and resulting sensing response“S gas ” of the sensors calculated by using the relations:S gas =G gas − G0G0for reducing gases orS gas =G0− G gas G gas for ... WO3is one of promising material for gas sensorapplication, and during the last years many works have beenperformed on the structural, electrical properties and sensing characteristics of WO3ﬁlms...

gas sensing properties of metal - organics derived pt dispersed - tio2 thin film fired in nh3

... deal of efforts has been put into developing new sensing materials with improved sensor properties. Of these, n-type semiconducting materials such as SnO , ZnO2wx and TiO are promising materials ... S092 5-4 005 00 0051 7-7 ()I. Hayakawa 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 ... electron.Žmicroscope and FE-SEM field emission-scanning elec-.tron microscope . Valence states of Ti and Pt wereŽexamined by ESCA electron spectroscopy for chemical.analysis , and chemical compositions of...

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 ... 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 ... magnetron sputtering and aque-ous chemicalroute etc [9–12,14]. Comparedwith other techniques,aqueous chemical process is attractive because of its cost effective-ness and the ease of material preparation....

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