HYDROTHERMAL METHOD

some extent. Comparison of the surface areas listed in Table 2 shows that the ZnO sample synthesized at 120 ºC indeed had the largest surface area. The XRD pattern of this sample (Fig. 5c) could also be well indexed to hexagonal wurtzite ZnO (JCPDS Card No. 36-1451). 3.6. Photocatalytic activity of[r]

3nanostructures with hexagonal phase and mesopor-osity were obtained by using a two step aged-hydrothermalmethod. By using HRTEM we observed that the growthdirection of the tungsten oxide nanostructures is along [010]Fig. 4 – Transmission electron microscopy (TEM) micrographsof WO3nanostructures.Fig[r]

performance in electronic, piezoelectric, thermoelectric, and optoelectronic applications [1]. High electrical conductivity and transparency in a visible wavelength spectral range of the ZnO alloys have been regarded as an efficient candidate for transparent conducting electrodes of thin films and f[r]

) photocatalysts supported on woven glass fabric were prepared byhydrothermal method for photocatalytic reduction of NO with NH3. The photocatalytic activity testswere carried out in a continuous Pyrex reactor with the flow rate of 2000 mL/min under UV irradiation(luminous flux: 1.1× 104lm, irr[r]

0167-577X/$ -see front matter & 2013 Elsevier B.V. All rights reserved.http://dx.doi.org/10.1016/j.matlet.2013.05.072nCorresponding author. Tel./fax: +86 21 66134852.E-mail address: s.yuan@shu.edu.cn (S. Yuan).Materials Letters 107 (2013) 126–129similar to the flower shape of sample A. The br[r]

(UK), M. Perrut, F. Cansell (France), Buxing Han (China), K.P. Yoo and Y.W. Lee (South Ko-rea), etc., have done extensive studies in the area of supercritical fluid technology.Supercritical water (SCW) and supercritical fluids (SCF) provide an excellent reaction me-dium for hydrothermal process[r]

na-nofibres based on the hydrothermal method. This method mayopen a new door to synthesize novel morphology via changingsome conditions.2. ExperimentalThe titanium dioxide (TiO2, anatase) and sodium hydroxide(NaOH) are obtained as analysis pure grade and used withoutMaterials Sc[r]

The formation mechanism of mulberry-like ZnO particles was investigated by adding different types of alkalis and different amounts oftriethanolamine (TEA). Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD)were used to observe the morphology and cr[r]

considerable efforts have been paid to develop semicon-ductor photocatalysts for water splitting and degradation oforganic pollutants in order to solve the urgent energy andenvironmental issues [1–9]. However, to date, most of thephotocatalysts reported only respond to UV light irradiation(\420 nm).[r]

tures significantly improved the UV light emission at 380 nm wave-length, and successfully decreased the yellow and green bandemission. The as-grown ZnO flowerlike structures were prepared bythe hydrothermal method which could introduce excess zinc or oxy-gen vacancies [18]. Our results[r]

Li-ions. The Li-ion intercalation capacity was relatively wellstabilized upon cyclying: 513 and 472 mAh/g after secondand tenth cycle, respectively. The values are higher thanthat of conventional carbon-based anode materials (372mAh/g) in Li-ion batteries. Compared to the nanowires, theanode made fr[r]

grown by the conventional hydrothermal method (theirdiameters are usually in the range of 100–200 nm) [16], whichmay be associated with microwave effect. Fig. 3(c) presents ahigh-resolution transmission electron microscopy (HRTEM)image of a single WO3nanorod with the diameter of 20 nm.[r]

in large scale via a facile low temperaturehydrothermal route. The reaction pH and the molar ratio of W6+to Sn2+in the precursors played important roles in the final prod-ucts obtained. Although the hydrothermal method hasbeen appliedin the preparations of many tungstates [18–20], to th[r]

In this work, ZnO nanorods (NRs) were successfully grown on printed circuit board substrates (PCBs) by utilizing a one-step, seedless, low-cost hydrothermal method. It was shown that by implementing a galvanic cell structure in an aqueous solution of 80 mM of zinc nitrate hexahydrate and hexamethyle[r]

Ethylene glycol assisted hydrothermal synthesis of flower like ZnO architecturesS. Ashokaa, G. Nagarajua, C.N. Tharamanib, G.T. Chandrappaa,⁎aDepartment of Chemistry, Central College Campus, Bangalore University, Bangalore-560001, IndiabDepartment of Chemistry, Ruhr Universität Bochum, Bochum,[r]

under reducing gas atmosphere. Yumei et al. [1, 19] syn-thesized MoS2nanorods and nanospheres by hydrothermalmethod using ammonium molybdate with Na2S in presenceof NH2OH Á HCl as oxidizing agent. Hydrothermal syn-thesis is becoming popular for environmental reason, sincewater is used as reac[r]

products, indicating that those submicrospheres aremonodisperse with the sizes of 800–1000 nm. It can be seenthat the surface of those spheres is rough, which implies thatthose spheres may be self-assembled from smaller nanopar-ticles. TEM image of the submicrospheres is shown in Fig. 3,revealing th[r]

characteristic photochemical properties and high chemical stabil-ity [1]. Applications of TiO2have been explored in different fieldsincluding optoelectronics [2], photocatalysts [3], photoelectrodes[4], lithium rechargeable batteries [5], and sensor devices [6].Many studies in the fundamental and pra[r]

might hinder the growth rate of the crystal nucleus.The morphology of the samples showed the relativelyuniform hexagonal platelet-like sheets. The grain bound-aries were well defined with narrow size distribution.Moreover, the Co–Al HTLcs doped with magnetic sub-strates presented the paramagnetic pro[r]

hydrothermal method [13]. Yogamalar et al. prepared variousshapes of ZnO by a poly-ethylene glycol (PEG 4000)-assistedhydrothermal method [14]. (ii) Changing the alkaline environ-ments (such as monoethanolamine, diethanolamine). For example,Lu et al. used monoethanolamine (MEA),[r]