hydrothermal synthesis of tungsten oxide nanobelts

... formationmechanism of tungsten oxide nanobelts is proposed.© 2006 Elsevier B.V. All rights reserved.Keywords: Hydrothermal; Tungsten oxide; Nanobelts 1. IntroductionAs a new family of one-dimensional ... Hydrothermal synthesis of tungsten oxide nanobelts Xuchun Songa,⁎, Yang Zhaob, Yifan ZhengcaDepartment of Chemistry, Fujian Normal University, ... prepare tungsten oxide nanobelts via physical vapordeposition process [14]. In this work, we successfully synthe-sized tungsten oxide nanobelts via a Na2S and CTAB as assistedby a hydrothermal...

facile synthesis and no2 gas sensing of tungsten oxide nanorods assembled microspheres

... the synthesisof tungsten oxide nanorodsassembled microspheres by a facile hydrothermal method. To ourknowledge, there isno report on thegas sensing of the microsphere-like tungsten oxide nanostructures. ... [2,3].Nanostructures of well-established gas sensing materials like tin oxide [4–6], zinc oxide [7], tungsten oxide [8–10], titanium oxide [11,12], and indium oxide [13,14] have shown higher sensitivity,faster ... the par-tial collapse of the substructure of the microspheres should be themain reason of the decrease of effective surface area of the annealedsamples.Fig. 3. TEM image of the WO3·xH2O...

a rapid hydrothermal synthesis of rutile sno2 nanowires

... www.elsevier.com/locate/msebA rapid hydrothermal synthesis of rutile SnO2nanowiresO. Lupana,b,∗, L. Chowa, G. Chaic, A. Schultea,S.Parka, H. Heinricha,daDepartment of Physics, University of Central Florida, ... December 2008Keywords:Tin oxide NanowiresNanoneedles Hydrothermal synthesis abstractTin oxide (SnO2) nanowires with rutile structure have been synthesized by a facile hydrothermal methodat ... productsconsisted of nanowires as well as nanoparticles. The diameters of tin oxide nanowires are in the range of 70–150 nm with lengths of the order of 20–100 ␮m.When the ratio between SnCl4and NH4OH...

hydrothermal synthesis of monodisperse wo3 - h2o square platelet particles

... 2006AbstractMonodisperse particles of tungsten( VI) oxide monohydrate were prepared in a hydrothermal system at 40 °C, where 20 ml of HCl solution(1.50 mol/l) was added to the same volume of Na2WO4aqueous ... B.V. All rights reserved.Keywords: Tungsten( VI) oxide monohydrate; Tungstic acid; Monodisperse particle; Hydrothermal synthesis 1. Introduction Tungsten( VI) oxide and its hydrates, WO3·nH2O, ... on electrode, etc. Hydrothermal synthesis from Na2WO4in a low pH region isone of the typical ways to prepare tungsten oxide hydrates.Freedman [5] investigated influence of acid concentration...

hydrothermal synthesis of na2ti6o13 and tio2 whiskers

... Journal of Crystal Growth 275 (2005) e2371–e2376 Hydrothermal synthesis of Na2Ti6O13and TiO2whiskersDong-Seok Seoa, Hwan Kima, Jong-Kook Leeb,ÃaSchool of Materials Science ... puriﬁcation, decomposition of NOxand improvement of living conditions byremoval of various pollutants, etc. [19–21]. In thispaper, we also demonstrated the preparation of TiO2whisker by extracting ... powder made of TiO2spherical particleswas hydrothermally treated in an autoclave at200 1C for various times. Fig. 2 demonstrates themicrostructural evolution of TiO2particles withhydrothermal...

hydrothermal synthesis of tio2 nanofibres

... Hydrothermal synthesis of TiO2nanofibresFei-Bao Zhang, Hu-Lin Li⁎College of Chemistry and Chemical Engineering, Lanzhou University, ... March 2006AbstractTiO2nanofibres were synthesized by the hydrothermal method. The result shows that the growth of TiO2nanofibres is sensitive to theconcentration of NaOH and the heating temperature.© ... ( MOCVD) using t ita-nium-tetraisopropoxide (TTIP) as the precursor [10].In this paper, we report a novel strategy to synthesize TiO2nanofibres under hydrothermal conditions in alkaline solution.Compared...

hydrothermal synthesis of uniform wo3 submicrospheres

... this work, we found that tungsten oxide instead of tungsten sulfide was obtained whenthiourea was used in the hydrothermal treatment of tungsten acid. The morphology of specific products gradually ... morphological feature of the products asobserved by SEM.Thiourea is widely used as a source of sulfur in the hydrothermal synthesis of transition metal sulfides [13–15].However, in our case, tungsten sulfide ... 0.5 g of the above tungsten acid powder and 1 g of thiourea were mixed into 30 ml distilledwater. After 10 min of stirring, the mixture was transferredinto a Teflon container with capacity of...

large-scale hydrothermal synthesis of wo3 nanowires in the presence of k2so4

... size-dependent properties of 1D nanostructured tungsten oxide itselfas well as of inorganic derivatives prepared from the oxide. Recently, the hydrothermal synthesis of ultralong and single-crystalline ... past few years, much effort has been devoted to the synthesis of semiconductor nanowires, nanorods, and nanobelts, because of the importance of understanding the dimensionalityconfined transport ... Large-scale hydrothermal synthesis of WO3nanowiresin the presence of K2SO4Xu Chun Songa,⁎, Yi Fan Zhengb, E. Yanga, Yun WangaaDepartment of Chemistry, Fujian Normal...

low temperature hydrothermal synthesis of monodispersed flower - like titanate nanosheets

... work, we have reported the synthesis of sphericalTiO2nanosheets (flower-like morphology composed of nano-sheets) via simple hydrothermal synthesis using titanium butoxideas starting material ... [1,19], due to the factthat the synthesis of these TiO2nanomaterials offer fundamentalscientific opportunities for investigating the influence of size anddimensionality of materials with respect ... Preparation of titanate nanosheetsMonodispersed spherical titanate nanosheets were prepared by hydrothermal treatment in ammonia solution. An amount of 0.3 g of AS was suspended in 60 ml of ammonia...

microstructure characterization and no2 sensing properties of tungsten oxide

... supersaturation oftungstensource, promoting the growth of tungsten oxide nanowires [23].At higher concentration, the highly saturated WCl6could prohibitthe growth of tungsten oxide nanowires ... images of tungsten oxide nanostructures synthesized at WCl6concentration of 0.01M, 0.015M and 0.02 M, respectively, after annealing at 300◦C for 1h.(b) TEM image of the annealed tungsten oxide ... xxxKeywords: Tungsten oxide NanowiresNanosheetsSolvothermal synthesis Gas sensorsabstractNanowires and nanosheets of tungsten oxide were synthesized by solvothermal method with differ-ent tungsten...

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