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 h...

Ngày tải lên: 06/10/2015, 20:43

... 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...

Ngày tải lên: 21/06/2014, 05:20

... 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 sensi...

Ngày tải lên: 21/06/2014, 17:20

... 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 ma...

Ngày tải lên: 21/06/2014, 17:20

... 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 linea...

Ngày tải lên: 19/03/2014, 16:48

... 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...

Ngày tải lên: 20/03/2014, 13:04

... 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...

Ngày tải lên: 20/03/2014, 13:04

... 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...

Ngày tải lên: 20/03/2014, 13:06

... 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 -prep...

Ngày tải lên: 20/03/2014, 13:08

... 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 measu...

Ngày tải lên: 22/03/2014, 11:20

... 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 vol...

Ngày tải lên: 05/05/2014, 15:27

... 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...

Ngày tải lên: 28/05/2014, 14:44

... 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 li...

Ngày tải lên: 22/06/2014, 00:20

... 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 photores...

Ngày tải lên: 22/06/2014, 01:20

... 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 memo...

Ngày tải lên: 09/09/2015, 10:07