research on gas - sensing properties of lead sulfide-based sensor for detection

... sensor response measurements of NO2and NH3gases were replicatedPlease cite this article in press as: T. Fu, Research on gas- sensing properties of lead sulfide-based sensor for detection of NO2and ... toxic gases. Novel gas sensors were fabricated based on a single component of PbS layer and their responses to toxic gaseswere studied. The influences of preparation conditions of PbS on the sensor ... www.elsevier.com/locate/snb Research on gas- sensing properties of lead sulfide-based sensor for detection of NO2and NH3at room temperatureTiexiang Fu∗School of Chemistry and Bioengineering, Changsha University of Science...

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

... by drop-coatingsingle-crystalline, size-controlled WO2.72nanorod solution, andthen investigated the dependence of their material and gas- sensing properties on thermal treatment conditions. ... 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. ... effects on 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...

electrical and gas - sensing properties of wo3 semiconductor material

... the electrons of donor level are ionized completely, and the electronicconcentration of intrinsic exciting is less than the con-centration of donor in this temperature region. How-ever, when ... electrons release back WO3material, resulting in the increase of the electron con-Fig. 6. The eects of gas concentration on the sensitivity of sensor at 200°C.Fig. 7. Long time stability of ... calcinations temperature on the sensi-tivity gas concentration  100 ppm).Fig. 5. The in¯uence of operating temperature on the sensi-tivity of the sensor for ethanol and petrol 100 ppm, and for butane...

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

... particles or to offer n-type semiconductivity, whichcontributes to supply electrons necessary for adsorption of oxygen. However, it is known in the field of catalyst that)Corresponding author. ... decomposition exerts the high reductionwxeffect on TiO 10 . Also, nitrogen produced at the same2time reacts with oxide to form a solid solution or a nitridewx11 . Formation of Ti–N bonds is considered ... with TEM transmission 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...

gas sensing properties of nanocrystalline tungsten oxide synthesized by acid

... adjacentgrains.3.1. Gas Response—pure WO3Response to ammonia gas was measured for AP 600, BP 600,AP800 and BP 800 sensor elements. The sensor response was eval-uated asa function of operating temperature. ... gas. noticeable sensor response for AP 600 andBP 600 sensor elements.Fig. 3 shows the sensor response for AP800 and BP800 sensor elements to 4000 ppm NH3 gas. For both the sensors elementsmaximum response ... appli-cations for detectingtarget gases suchas NOx,O3,NH3, CO, CO2,H2Sand Sox[1–3] The working principle ofthese sensorsis based on the detection of a change in resistance on exposure...

gas sensing properties of nanoparticle indium - doped wo3 thick films

... saturation effectin sensor response takes place at 10 ppm of ethanol. Subse-quentinjectionsofethanolto increaseits concentrationto 100Fig. 3. Responses to carbon monoxide of indium-doped WO3sensors ... effects of indium concentration in the detection of nitrogen dioxide and carbon monoxide, respec-Table 1Responsiveness of pure nanopowder WO3 sensing layers to NO2(1 ppm) asa function of the ... 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 ﬁlms...

gas sensing properties of wo3 doped rutile tio2 thick film at high operating temperature

... Gas sensing properties of WO3doped rutile TiO2thick ﬁlm at highoperating temperatureSung-Eun Jo, Byeong-Geun Kang, Sungmoo Heo, Soonho Song, Yong-Jun Kim*School of Mechanical ... morphological properties of the sensing ﬁlm were characterized with scanning electronmicroscopy (SEM), atomic force microscopy (AFM) and X-ray diffraction (XRD). The gas sensing proper-ties of the ... shows the results of NO2(500 ppm) detection at 600 °C.The undoped and two WO3doped TiO2sensors exhibited a gas sensing property similar to that of a p-type, semiconductor gas sensor. The sensitivity...

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

... and500–1000 ppm). The linear dependent of the ethanol concentration on the sensor response of our PtO2-doped SnO2 sensor for the nar-row ethanol concentration range is consistent with that previousreported ... insufﬁcientnumber of oxygen anions available on the surface of the MWCNTs-doped SnO2materials for reaction with LPG.The 90% response time for gas exposure (t90%(air-to -gas) ) and that for recovery ... National Key Research Pro-gram for Materials Technology (Project No. KC 0 2-0 5/0 6-1 0), the research projects of Vietnam Ministry of Education and Training(Code B200 8-0 1-2 17 and B200 8-2 1-0 9)...

controlled synthesis and gas sensing properties of hollow sea urchin like

... of the logarithm of response of the three kinds of sensors versus thelogarithm of gas concentration. The linear equations and correla-tion factor, R, were given in Table 1. The value of ˇ for ... linear equations and correlation factor for the chart of the logarithm of response of the three kinds of sensors versus the logarithm of gas concentration. Sensor Hollow sea urchin-like nanostructures ... hollow sea urchin-like - Fe2O3nanostructures to ammonia (560 ppm, - -) , formaldehyde (160 ppm, - -) ,acetone (170 ppm, - -) , triethylamine (90 ppm, - -) and ethanol (210ppm, - -) atdifferent...

market research on plywood and paper of cau duong timber factory

... (ODA) and money transmission from over seasVietnamese. The main reason for the rise in urbanization velocity came from out- of- date and bad condition of Vietnam’s infrastructure. Open-door policy ... controlCapitalconstructionHealth-care,Security,Pre-schoolSalesdepartmentFinancebureauRepository of end-productPaper-prefabricationPlant5Tran Thi Phuong Mai - 345BIn addition, Vietnamese consumers often prefer foreign product to domestic one.Branch names are always considered ... Selling-price of Cau Duong Factory 46Summary 47Chapter v: limitations 49Chapter VI: conclusions and recommendations 50I. Conclusions 50II. recommendations 511. Improving Awareness of the...

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