characterization of h - wo3 nanorods synthesized by hydrothermal process

... induce the formation of the 1D nanostructures of h- WO3. Thus, the size and the yield of the rod-like nanostructures increase with increasing the amount of the salt. As a result, the presence of ... the synthesized material is made of homog-enous phase with uniform particles which display nanorods mor-phology sizing about 5lm in length. TEM image (Fig. 2e) showsthat the as -synthesized ... amount of Na2SO4plays a key role in the formation of the h- WO3 nanorods evolved from the oriented attachment of h- WO3nanoneedles.Controlled experiments have shown that the presence of anilinewithout...

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

... WO3·1/ 3H 2O needles has been synthe-sised by Figlarz and co-workers [31] by hydrothermal syn-thesis of tungstic gel at 120◦C. These needles on heating at250◦C yielded hexagonal WO3, but there ... on the other end of the particles by the condensation of WOxfrom the vapourstate. A similar mechanism is plausible in the present nano-tube synthesis, where the role of the reducing H 2/N2gas ... thisarticle we report the synthesis of WO3 nanorods of 5–50 nmin diameter and 150–250 nm in length, in gram quantities by a simple hydrothermal method. WO3 nanorods were re-duced with H 2S...

Synthesis and photoluminescence property of silicon carbon nanowires synthesized by the thermal evaporation method

... that nanowireshave a crystalcore and an amorphous sheath with thickness about2 nm. The SiO2sheath could be easily removed by etching inhydroﬂuoric acid (HF). The thickness of the SiO2sheath ... precursor of SiH4or SiCl4(CH4). In addition, the synthesized products were of lowyield and with much SiC bulk. Thus, large-scale synthesis of pureb-SiC nanowires still remains a challenge ... microscopy. The results show that the synthesized products mainly consist of nanowires, which are single-crystallineb-SiC with diameters of about 50 nmand tens of micrometers long. The nanowires...

gas sensing properties of nanocrystalline tungsten oxide synthesized by acid

... sampleholder and the working temperature of the thick films was deter-mined with a thermocouple attached near the sensor element. Thegas or vapour of required amount was injected into the chamberusing ... aque-ous chemicalroute etc [9–12,14]. Comparedwith other techniques,aqueous chemical process is attractive because of its cost effective-ness and the ease of material preparation. This technique ... calcinations are in the range of 30–150 nm.The gas sensing properties of these powders in the form of thick film were investigated with and withoutplatinum doping. Gas response of thick films sintered...

preparation and characterization of monodispersed wo3 nanoclusters on tio2(110)

... area of STM images. The mass units (y-axis) are normal-ized in units of the mass of WO3. The dashed line is a least squares linear ﬁt thatpasses through the origin. The slope determines the ... Ti4+exhibit lower intensity than the third that lies further from theunderlying surface than the other two and is tilted towardsone or the other of the adjacent O2Àrows. Finally, thecalculated ... eachpanel denote the largest coverage of CH3OH that does not exhibit a multilayerpeak.CH3OH. There is no evidence for oxidation on either surface;the only desorbing species is CH3OH....

Báo cáo khóa học: Puriﬁcation and functional characterization of insecticidal sphingomyelinase C produced by Bacillus cereus ppt

... [2].Although the insecticidal activity of these proteins hasbeen evaluated, it is unclear whether the toxins in theregurgitant of antlions are limited to these two proteins,and whether other ... which were eluted by increasing the KClconcentration in the buffer (Fig. 1A). The MPD value of the Through fraction was 328 ± 194 (n ¼ 2, mean ±SEM), whereas that of the fractions eluted by ... reduced the maximum rate of hydrolysis of sphingomyelin, and the afﬁnity of sphingo-myelin for the wild-type and H1 51A mutant SMCs wasalmost the same (Kd 50 lM), suggesting that the catalyticrate...

ethanol sensing properties of tungsten oxide nanorods prepared by

... WO3ÁnH2O nanospheres by asimple MH method [19]. Here, we successfully synthesized WO3 nanorods by a MH method at 180 8C in 20 min. Thismethod required a shorter synthesis time, and the reaction process ... 0.3691 nm, which is close to theinterplanar spacing of the (1 1 0) lattice planes of h- WO3. Thismeans that the axial direction of the prepared nanorods is alongthe direction of the (1 1 0) ... notingthat the nanorods prepared here are obviously thinner than thosegrown by the conventional hydrothermal method (theirdiameters are usually in the range of 100–200 nm) [16], whichmay be associated...

controlled growth of zinc oxide microrods by hydrothermal process

... growth solution changes from beingslightly acidic to mildly basic, within about one hour of the onset of the hydrothermal process [24,31]. The growth solution turns ba-sic during growth process ... Morphology of ZnO rods grown onc-alumina and calcined diatomite substrates by hydrothermal process after 10 h of growth. Prior to the growth process, pH of growth solution after immersing the ... substrates by hydrothermal process after 10 h of growth. The precursor solution (equimolar concentration of Zn(NO3)2and hexamine) was changed every 5 h during the growth process; (a) 5 mM of Zn2+,...

photocatalytic properties of hierarchical zno flowers synthesized by a

... growth atrelatively high temperature, electrochemical and solution-basedmethods for self-assembly of hierarchical ZnO [11,12]. Among thesesynthesis methods, the ... increased by the diffuse reflec-tion happens among the petals, as shown in the inserted figure of Fig. 4(b). On the other hand, the microstructure of the ... microscope (SEM,Hitachi S-4800). X-ray photoelectron spectroscopy (XPS) experi-ments were measured with a K-Alpha (Thermofisher ScienticficCompany) X-ray photoelectron...

hydrothermal synthesis and characterization of self - assembled h - wo3

... (b) urchin-like (NH4+-based EDTA) and (c) JCPDS card # 3 3-1 387, hydrother-mally synthesized at 180◦C for 8 h. solutions are shown in Fig. 1. For the as -synthesized h- WO3withNa+-based ... intense and sharp diffraction peaks (Fig. 1a)are observed, indicative of high-degree crystallinity. On the otherhand, the as -synthesized h- WO3with the NH4+-based EDTA sam-ple showed broader ... sulfatethrough a simple hydrothermal process. The processfacilitates con-trol over the shapes of nanowire bundles and nanorods, allowingthe formation of urchin-like crystalline h- WO3via...

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