characterization of h - wo3 nanorods synthesized by hydrothermal process

... induce the formation of the 1D nanostructures of h- WO 3 . 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 5 l m in length. TEM image (Fig. 2e) shows that th...

Ngày tải lên: 19/03/2014, 16:47

... WO 3 ·1/ 3H 2 O 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 at 250 ◦ C yielded hexagonal WO 3 , but there ... on the other end of the particles by the condensation of WO x from the vapour state. A similar mechanism is plausible in the present nano- tube synthesis, where the role...

Ngày tải lên: 19/03/2014, 16:48

... that nanowires have a crystalcore and an amorphous sheath with thickness about 2 nm. The SiO 2 sheath could be easily removed by etching in hydrofluoric acid (HF). The thickness of the SiO 2 sheath ... precursor of SiH 4 or SiCl 4 (CH 4 ). In addition, the synthesized products were of low yield and with much SiC bulk. Thus, large-scale synthesis of pure b -SiC nanowires still remai...

Ngày tải lên: 16/03/2014, 15:21

... sample holder and the working temperature of the thick films was deter- mined with a thermocouple attached near the sensor element. The gas or vapour of required amount was injected into the chamber using ... 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 prepara...

Ngày tải lên: 19/03/2014, 16:48

... area of STM images. The mass units (y-axis) are normal- ized in units of the mass of WO 3 . The dashed line is a least squares linear fit that passes through the origin. The slope determines the ... Ti 4+ exhibit lower intensity than the third that lies further from the underlying surface than the other two and is tilted towards one or the other of the adjacent O 2À rows. Finally, the...

Ngày tải lên: 20/03/2014, 13:06

... [2]. Although the insecticidal activity of these proteins has been evaluated, it is unclear whether the toxins in the regurgitant of antlions are limited to these two proteins, and whether other ... which were eluted by increasing the KCl concentration 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 elut...

Ngày tải lên: 30/03/2014, 13:20

... WO 3 ÁnH 2 O nanospheres by a simple MH method [19]. Here, we successfully synthesized WO 3 nanorods by a MH method at 180 8C in 20 min. This method required a shorter synthesis time, and the reaction process ... 0.3691 nm, which is close to the interplanar spacing of the (1 1 0) lattice planes of h- WO 3 . This means that the axial direction of the prepared nanorods is alo...

Ngày tải lên: 05/05/2014, 15:27

... growth solution changes from being slightly 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 on c -alumina and calcined diatomite substrates by hydrothermal process after 10 h of growth. Prior to the growth process, pH of growth solut...

Ngày tải lên: 06/05/2014, 13:23

... growth at relatively high temperature, electrochemical and solution-based methods for self-assembly of hierarchical ZnO [11,12]. Among these synthesis 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...

Ngày tải lên: 06/05/2014, 13:26

... (b) urchin-like (NH 4 + -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- WO 3 with Na + -based ... intense and sharp diffraction peaks (Fig. 1a) are observed, indicative of high-degree crystallinity. On the other hand, the as -synthesized h- WO 3 with the NH 4 + -based EDTA sam-...

Ngày tải lên: 19/03/2014, 16:48