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Crystalline zinc oxide powders with various morphologies have been prepared by hydrothermal treatment of zinc acetate in pure water, different concentrate KOH aqueous solutions. The morphology and structure of the products were characterized by scanning electron microscopy, X-ray diffraction and Raman spectra. It was found that the concentrate of KOH play an important role in controlling the morphologies...
Microcrystallines of bio-upconversion (UC) phosphor NaYF4:Yb3+/Er3+ were prepared by the complex precipitation method and the hydrothermal method in the presence of sodium citrate. The precusor synthesized by the complex precipitation method was annealed at different temperature, and another was hydrothermal treated at different time. The structure, morphology and upconversion fluorescence of the...
Mn1Ce1 and Mn0.9Co0.1Ce1 complex oxides were prepared by co-precipitation in hydrothermal conditions and their physicochemical properties were characterized with N2 adsorption, XRD, Raman, and SEM. The complex oxides show enough stability and catalytic activity for oxidative degradation of 4,4'-Dibromobiphenyl in sub-critical water. Mn0.9Co0.1Ce1 has higher activity than Mn1Ce1, indicating doping...
The aim of this study was to evaluate the inhibitory effect of taurine and complex magnesium taurate on the crystallization of calcium oxalate with measurement of electrical conductivity and morphology. The results of electrical conductivity research suggest that both taurine and complex magnesium taurate can inhibit the growth of calcium oxalate crystals, but the latter has much stronger capability...
Bimetals (Na, Mg, Li, Cr) doped nanotitania was prepared using a modified hydrothermal method from a titanium mineral. The samples, along with a commercial sample, were then annealed from 873 K to 1273 K, at 100 K intervals. Both samples were characterized using a variety of methods such as the XRD (crystallite size and phase conversion temperature), SEM (morphology) and BET (surface area). It was...
The preparation of birnessite manganese dioxides (MnO2) nanoflakes films on Ti substrate by hydrothermal method were studied in this paper. The structure and morphology were characterized by XRD and SEM. In conclusion, the material may have the great potential application as supercapacitor material.
Summary form only given. Multiferroics have attracted considerable attention recently because of their fascinating physical behaviors and potential applications. BiFeO3 is one of the well-known multiferroic compounds displaying coexistence of ferroelectricity and antiferromagnetism [1]. The BiFeO3 properties in nanosize were especially helpful for understanding the foundational ferroelectric and magnetic...
Here, an improved solvothermal reduction for the formation of high-quality graphene is reported. Graphite oxide (GO) are prepared using a modified Hummers method form expandable graphite. Then, GO sheets are dispersed into the mixture of hydrazine and water in a sealed autoclave maintained at 180°C for 18h. X-ray diffraction (XRD) pattern of the prepared GO is compared with that of graphene obtained...
Highly aligned ZnO nanotube array films on the conducting substrates have been synthesized by a simple hydrothermal method. The as-synthesized ZnO nanotubes have diameters of 300-400nm and lengths of 7μm (the aspect ratios of ~20). The field emission of ZnO nanotube array films shows a turn-on field of about 4.6V/μm at a current density of 1μA/cm and emission current density up to about 0.22mA/cm2...
Summary form only given.Recently, there is an increased interest in quantum dot sensitized solar cell (QDSSC), i.e., applying semiconductor quantum dots (QDs) in dye-sensitized solar cells [1]. However, QDSSCs have shown comparatively lower efficiencies than expected. One possible reason for the poor efficiency of QDSSC is the difficulty of assembling the QDs on ZnO surface to obtain a well-covered...
In this paper, we report on the synthesis of 1D TiO2 nanostructure films on fluorine-doped tin oxide (FTO) substrates via an interface reaction of nonpolar solvent and hydrophilic FTO glass substrate under solvothermal conditions.
Electrical dc conductivity and laser damage threshold of pure and urea doped KH2PO4 crystals are investigated. It is found that the crystals with a low electrical conductivity have a high laser damage threshold. It is shown that increase of the resistivity and the laser damage threshold of the crystals realizes by the crystal growth from urea-containing aqueous solutions. The optimum molar value of...
A monochromatic THz radiation source with broadband tunability utilizing N-benzyl-2-methyl-4-nitroaniline (BNA) crystal has been developed. BNA quality was improved by applying solution growth method instead of melt method. BNA-THz source using difference frequency generation was further optimized.
Single crystals of bismuth ferrite-lead titanate (BFPT) were grown using a flux method. Starting from bismuth ferrite, we added lead titanate, to produce a range of compositions within the BiFeO3-PbTiO3 solid solution, through to the morphotropic phase boundary (MPB). Using a PbO:Bi2O3 flux, and a cooling rate of 0.5°C/h over the temperature range where crystal growth is expected, our aim was to produce...
Single crystal In(OH)3 nanorods and nanocubes were hydrothermally synthesized from aqueous InCl3 solution. Indium hydroxide, In(OH)3, was precipitated at 90°C for 12 h and was changed into a transient In2O3 phase upon calcination at 400°C for 1h in air. The increase of the concentrations of indium chloride tetrahydrate would promote the formation of cube-like nanostructures. In order to understand...
A new room-temperature, aqueous solution-based preparation method for chalcopyrite CuInSe2 has been developed. Using 10% aqueous ethylenediamine as a solvent, the slow addition of Cu(NO3)2 to a mixture of indium(III) acetate, elemental Se, and sodium thioglycolate results in the formation of CuInSe2 as characterized by Raman spectroscopy. During this reaction, a kinetically-stable Cu2-xSe(s) intermediate...
Ce-doped TiO2-multi walled carbon nanotubes (Ce-doped MCNTs/TiO2) composites were successfully synthesized by the hydrothermal method. The crystalline structure, surface morphology and optical properties of samples were characterized using X-ray diffraction (XRD), transmission electron microscope (TEM) and ultraviolet-visible diffuse reflection spectroscopy (UV-vis) analysis technologies. The Ce-doped...
Using waster residue phosphogypsum as raw materials, calcium sulfate whiskers were prepared by the hydrothermal method. The products were characterized by XRD, SEM and FT-IR, etc. The effects of reaction temperature and time, initial solid-to-liquid ratio of slurry, and different additives on the morphology and content of the samples' soluble-phosphates were studied. The results showed that the optimal...
A nickel complex constructed by the ligand: imidazole has been synthesized, using solvent evaporation method its single crystal was successfully obtained. Its structure has been determined by means of X-ray single crystal diffraction. Its third-order nonlinear optical property has been studied using Z-scan technique with 20 picosecond (ps) pulses at wavelength 1064 nm. Its molecular second hyperpolarizability...
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