Hydrothermal minerals

facile large scale synthesis of ws2 nanotubes from wo3 nanorods prepared by a hydrothermal route

... mesolamellar precursors resulted in WO3 nanorods in large quantity [26] Recently, the synthesis of WO3 nanorods at a large scale [27] has been described by the oxidation of W(CO)6 with an amine ... in gram quantities by a simple hydrothermal method WO3 nanorods were reduced with H2 S to obtain a very high yield of multiwalled WS2 nanotubes Experimental 2.1 Synthesis of WO3 nanorods An aqueous ... Conversion of WO3 nanorods to WS2 nanotubes An alumina crucible containing WO3 nanorods was placed in a tubular furnace and heated up to 840 ◦ C in Ar gas flow, then switched to H2 S gas for 30 at 840...

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

... concentration of NO2 was 1/100 of those of the other gases These results demonstrated the high gas response and selective detection of WO3 nano-porous microspheres to NO2 The selective detection and gas ... the effective gas diffusion (Fig 5) The gas response was improved fur- Fig Dynamic sensing transients of (a) R30-RH and (b) R30 sensors and (c) gas responses (Rg /Ra ) of R30-RH and R30 sensors ... both of high surface area and large pore volume 3.4 Gas sensing characteristics As stated above, the gas responses of the R5 and R0.5 powders were negligible Thus, the gas responses of the R30-RH...

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hydrothermal synthesis and characterization of - feooh and fe2o3 uniform nanocrystallines

... agglomerate and form fusiform nanocrystallines Finally, the ␣ -FeOOH Fig The EDS spectra of the as-prepared porous fusiform ␣-Fe2 O3 nanocrystallines 220 X Liu et al / Journal of Alloys and Compounds ... pattern of the rodlike ␣ -FeOOH nanocrystallines taken on a mass of ␣ -FeOOH nanorods reveals the satisfactory crystallinity of the sample, which can be indexed to the pure Fig TEM image of the ... electron microscope images of a typical sample of fusiform ␣-Fe2 O3 nanocrystallines obtained at 140 ◦ C for 24 h and indicate the large quantity and good uniformity ␣-Fe2 O3 nanocrystallines were...

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hydrothermal synthesis and characterization of self - assembled h - wo3

... sharp diffraction peaks (Fig 1a) are observed, indicative of high-degree crystallinity On the other hand, the as-synthesized h- WO3 with the NH4 + -based EDTA sample showed broader peaks with ... urchin-like (NH4 + -based EDTA) and (c) JCPDS card # 3 3-1 387, hydrothermally synthesized at 180 ◦ C for h solutions are shown in Fig For the as-synthesized h- WO3 with Na+ -based EDTA, intense and ... bundles and urchin-like structure crystalline hWO3 samples were synthesized through hydrothermal reaction of Na2 WO4 · 2H2 O, HCl and Na+ - or NH4 + -based EDTA salt solutions in the presence of Na2...

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hydrothermal synthesis and characterization of some polycrystalline iron oxides

... have been evidenced Thus the hydrothermal route can be successfully used for the synthesis of variousiron oxides taking the advantage of an environmentally friendly and of a less energy consuming ... intensity of the second and ®fth lines of the spectra, in the case of oxides This behaviour can be explained by the preferential orientation of the platelike particles, parallel to the surface of the ... ®ltered and then oxidised by drying at 110 C in air F Another path in the hematite synthesis was the direct hydrothermal treatment of an homogeneous mixtures of ferric nitrate (1 M) and urea...

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hydrothermal synthesis and characterization of tio2 nanorod arrays on glass substrates

... distribution of TiO2 nanorods grown on PT-substrate at an annealing temperature of 700 8C and at a hydrothermal growth temperature of 160 8C and with growth time of h Fig SEM image of TiO2 nanorod arrays ... electron diffraction of TiO2 nanorods; (b) lattice fringes image of high-resolution TEM of one single TiO2 nanorod at the side surface that TiO2 nanorods grow along the (1 0) crystal planes, and ... orientation becomes poor, and the diameter distribution of TiO2 nanorods becomes wide The microstructure of TiO2 nanorods was further analyzed using TEM and HRTEM Two rods with a diameter of about...

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hydrothermal synthesis and crystal structure of a novel one - dimensional tritungstate

... contributions from 1-, 2- and 4y 4-coordinated oxo groups Each W6 O 20 unit consists of a pair of center -of- symmetry-related W3 O 10 trimers of edge-sharing WO6 octahedra as shown in Fig Adjacent 4y W6 ... organicrinorganic hybrid phases are obtained and structurally identified using the single crystal X-ray diffraction method Brief crystal data of one of the phases, a mono- Results and Discussion The ... initially isolated from the hydrothermal reaction of WO , en, NaOH and H O in polycrystalline form Replacement of NaOH with LiOH produces the same crystalline phase with similar product quality and...

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hydrothermal synthesis and photoluminescence of tio2 nanowires

... image of the (1 1) plane of anatase TiO2 , which showed the formation of single crystalline anatase TiO2 nanowires in our experiments The growth of single-crystalline TiO2 nanowires in the hydrothermal ... 473 nm is stable and strong These results indicate that the optimal excitation wavelength for TiO2 nanowires is 473 nm The PL intensity of TiO2 nanowires is higher than that of TiO2 nanocrystals ... the PL spectra of the TiO2 nanowires at room temperature together with that for TiO2 nanocrystals The excitation wavelength for curves (1) and (2) is 413 nm, and that for curves (3) and (4) is 473...

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