Fabrication of tungsten oxide nanostructured films using anodic porous alumina and application in gas sensing
Fabrication of tungsten oxide nanostructured films using anodic porous alumina and application in gas sensing
... Trioxide Thin Films for Gas Sensing Applications The deposition of the sensing layer is the most crucial part in the preparation of gas sensors Three ways of depositing tungsten trioxide (and in general ... vs Anodizing Voltage [Sullivan et al 1970] 2.1.5 Some Applications of Anodic Porous Alumina Some applications of porous alumina are briefly described here Porous alumina films on aluminum can ... Enhance Gas Sensing 40 2.2.6 Structural Properties of Tungsten Trioxide 42 2.2.7 Methods of Depositing Tungsten Trioxide Thin Films for Gas Sensing Applications 44 2.2.8 Methods of...
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Báo cáo hóa học: " Formation of tungsten oxide nanostructures by laser pyrolysis: stars, fibres and spheres" ppt
... Case of iron nanoparticles J Appl Phys 2010, 107:014906 doi:10.1186/1556-276X-6-166 Cite this article as: Govender et al.: Formation of tungsten oxide nanostructures by laser pyrolysis: stars, fibres ... growth of nanowires of tungsten trioxide and platinum, respectively Since the tungsten trioxide nanowires were grown with a low precursor concentration using a similar laser beam and laser parameters, ... production of thin films by laser pyrolysis, characterization, analysis, interpretation of experimental results and manuscript handling AF performed the optical alignment of the laser pyrolysis and...
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Báo cáo hóa học: " Fabrication of Porous TiO2 Hollow Spheres and Their Application in Gas Sensing" pdf
... further investigated by the TEM image as shown in Fig 1b, and the intensive contrast between center and edge of the spheres indicates the formation of hollow structure in the final products, and the ... 300 and 400°C) In the gas- sensing test, HCHO gas was diluted in water vapor, and the flow velocity of the mixed gas was controlled at 0.6 L/min The sensor sensitivity was defined as the slope of ... gas sensitivity attributed to the porous structure and large specific surface area indicates the importance of the microstructure control of gas- sensing layers Conclusions In summary, porous TiO2...
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báo cáo hóa học:" Growth and structure analysis of tungsten oxide nanorods using environmental TEM" doc
... pattern (c) of the tungsten oxide nanorod Figure TEM of tungsten nanowire and HRTEM and TEM images of the nanorod (a) TEM image around the surface of non-heated tungsten wire (b, c) TEM and HRTEM ... as: Tokunaga et al.: Growth and structure analysis of tungsten oxide nanorods using environmental TEM Nanoscale Research Letters 2012 7:85 Submit your manuscript to a journal and benefit from: Convenient ... than that of the tungsten under the surface oxide layer, so the volume expansion of tungsten is much larger than that of the amorphous oxide layer when the tungsten wire is heated Tungsten oxide...
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facile synthesis and no2 gas sensing of tungsten oxide nanorods assembled microspheres
... increases from 350 to 550 ◦ C The gas sensing of monoclinic tungsten oxide has been extensively studied There are also reports on the gas sensing of hexagonal tungsten oxide [36,37] In our present ... increase of gas concentrations Fig 9d shows the profiles of the sensor responses as a function of NO2 gas concentrations The sensor responses increase nearly linearly with the increase of NO2 gas concentration ... acid /tungsten ratio of 4:1 Inset is the corresponding diffraction pattern 3.3 Gas sensing properties The gas sensing properties of the annealed microspheres were evaluated by exposing the microspheres...
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hydrothermal synthesis of tungsten oxide nanobelts
... patterns of WO3 nanobelts The electron-induced X-ray fluorescence (EDS) analysis was employed to determine the composition of the tungsten oxide nanobelts As shown in Fig 2, only oxygen and tungsten ... discussion The morphologies of as-prepared WO3 nanobelts were determined by SEM and TEM (Fig 1) Fig 1a and b shows the typical patterns of WO3 nanobelts prepared via the hydrothermal route by using ... and tungsten elements existed in the nanobelts with the molar ratio of about (O/W) In Fig 3, a representative XRD pattern for our assynthesized tungsten oxide nanobelts is displayed All the main...
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microstructure characterization and no2 sensing properties of tungsten oxide
... varying NO2 concentration at an operating temperature of 200 ◦ C Please cite this article in press as: Y Qin, et al., Microstructure characterization and NO2 -sensing properties of tungsten oxide ... nanowires, mixture and nanosheets after annealing Please cite this article in press as: Y Qin, et al., Microstructure characterization and NO2 -sensing properties of tungsten oxide nanostructures, ... et al., Microstructure characterization and NO2 -sensing properties of tungsten oxide nanostructures, Sens Actuators B: Chem (2010), doi:10.1016/j.snb.2010.06.063 G Model SNB-12446; No of Pages...
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preparation of aqueous sols of tungsten oxide dihydrate
... suspension from a standpoint of gas sensor applications In the present study, we examined the possibilities of obtaining aqueous sols of WO3Á2H2O from an aqueous solution of Na2WO4 by an ion-exchange ... properties of the acidification products This paper aims at reporting the ion-exchange based preparation of WO3Á2H2O sols from Na2WO4 Formation and characterization of the sols as well as the effects of ... WO3Á2H2O sols (LPA) and crystallite sizes of the corresponding gel after dried or calcined at the designated temperatures (XRD) as a function of total centrifuging time ð0 0Þ of WO3 Á 2H2 O ! ð0 0Þ of...
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structural and electrochromic properties of tungsten oxide prepared by surfactant-assisted process
... of microstructural and electrochromic properties of the nanostructured tungsten oxides with mesopores from the TMDD surfactantassisted process The crystallization status, surface morphology and ... surfactant was used as a structural- directed template, mesoporous tungsten oxide was obtained by the modified sol–gel route The microstructural properties of the as -prepared tungsten oxides thin films ... Spectroelectrochemical and monochromatic Fig Survey scan XPS spectra (a) and W 4f high-resolution XPS spectra (b) for tungsten oxide films of sample A, sample C and sample D, and O 1s level peak analysis of sample...
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Báo cáo " Research, design and fabrication of a high-power combiner using Wilkinson bridge of L-band " pptx
... Thanh, Nguyen Anh Tuan, Bach Gia Duong, Research, Design And Fabrication Of The 45W And The 200W, L-Band Power Amplifier Using The Modern Microstrip Technology For Application In The National ... have also investigated the S11 factor of the power divider Wilkinson on network analyzer, the result was relatively similar to that of the simulink model Afterthat we have measured the characteristics ... was studied because this frequency will application in our the next reseach for design and fabrication of a transmitter system for the phase identification code D.T Thuy et al / VNU Journal of...
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ethanol sensing properties of tungsten oxide nanorods prepared by
... proportion of WO3 Fig Powder XRD pattern of WO3 nanorods prepared by microwave hydrothermal process Fig EDX spectrum of WO3 nanorods The morphology and microstructure of the products are examined by ... conduction modulation by the absorbed gas molecules [8] The excellent ethanol sensing property of the WO3 nanorods could be interpreted by the high surface to volume ratio of the nanorods and the ... nanorods The sensing characteristic of the WO3 nanorods at temperatures of 370–500 8C with ethanol concentration of 1000 ppm is shown in Fig 4(a), which reveals that the sensitivity of the sensors...
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properties and sensor performance of zinc oxide thin films
... Properties and Sensor Performance of Zinc Oxide Thin Films by Yongki Min Submitted to the Department of Materials Science and Engineering on August 21, 2003 in Partial Fulfillment of the ... Education 2003 - Ph.D., Materials Science and Engineering, MIT, Cambridge, MA, USA Thesis title: Properties and Sensor Performance of Zinc Oxide Thin Films 1990 - M.S., Metallurgical Engineering, ... exp − Εg kT (2.19) where Nc and Nv are the density of state of conduction band and valence band, respectively, and Eg is the energy band gap of materials When electrons and holes are tightly bound...
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Báo cáo hóa học: " Use of Ionic Liquid in Fabrication, Characterization, and Processing of Anodic Porous Alumina" pot
... providing the original idea of using ionic liquids in the preparation of anodic porous alumina and for the recommendations, thereafter, and Mr Claudio Larosa for technical support and useful ... dotted line: same conditions as in Fig 1a (i.e., with cooling and without stirring) but the 10-fold diluted EL Dashed line: RT, no stirring Continuous line: RT, stirring Thick line: cooling, no ... rate of the pores and the diffusion rate of the ions involved in the chemical reactions of the anodization (namely the incoming O2- and the outcoming Al3?, with respect to the anode) Since in first...
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Báo cáo hóa học: "Fabrication of Large Area Periodic Nanostructures Using Nanosphere Photolithography" ppt
... Results A large area of HCP monolayer of silica microspheres was formed as shown in Fig 5a The Scanning Electron Fig (a) A typical SEM image of a large area of uniform nanopillars of photoresist ... development; (b) the enlarged view of the nanopillars Fig (a) A typical SEM image of a large area of HCP monolayer of silica microspheres forming on top of photoresist; (b) the titled view of the spheres ... A large area of HCP monolayer of silica microspheres was formed by the Fig One example of the focus process by the silica micro-sphere of lm Fig The schematic process of NSP for fabrication nanostructures; ...
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Growth and characterization of nickel oxide thin films and nanostructures for novel device applications
... dissertation, the growth and characterization of nickel oxide (NiO) for various novel device applications are investigated In the aspect of growth, many methods of both solution-based and physical ... nanowires was demonstrated for the first time The applications of NiO thin films and nanostructures were then investigated for resistive switching memory and electrochromic devices For the NiO resistive ... Literature Review Growth of NiO Thin Film 2.1.1 Physical deposition of NiO thin film 2.1.2 Solution growth of NiO thin film 2.2 Growth of NiO Nanostructures by Thermal...
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