Papers by Keyword: Solvothermal

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Authors: Xiang Huang, Jiao Jiao Sun, He Huang, Bo Wang
Abstract: Nanocrystalline tin phosphide Sn4P3 was synthesized from red phosphorus and tin chloride SnCl22H2O by a low temperature (200°C) solvothermal reaction in ethanolamine for only 10 hours. The important parameters of solvothermal processmolar ratio of initial components (P/Sn), temperature and duration were investigated. The phase, composition and morphology of the products were characterized by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM). The ideal solvothermal conditions to synthesize pure and nanocrystallined Sn4P3 were summarized in this work.
Authors: S. Wannapaiboon, A. Rujiwatra
Abstract: Barium zirconate fine powders of pure cubic phase were readily prepared from the reactions between BaCl22H2O and ZrOCl28H2O under ammonothermal conditions at a very low temperature of 130oC as the lowest. KOH concentration was important in determining phase formation and particle morphology. Reaction temperature and time showed influences on the evolution of particle morphology and aggregation formation, respectively. Sizes of the primary particles critically depended on the BaII:ZrIV mole ratio. Phase formation mechanism is suggested.
Authors: Mohamed S. Abdel Latif, N.M. Shaalan, Ahmed A. El-Moneim
Abstract: Cu2SnS3 flower-like nanoparticles consisted of nanoflakes were successfully produced using solvothermal technique at 120°C for 12 h. The precursors used in this process were CuCl2.2H2O, SnCl2.2H2O, and thiourea with dimethyl sulfoxide (DMSO) as a solvent. The results showed that the as-obtained product was triclinic Cu2SnS3 with secondary phases CuS and SnS, and after annealing process, a pure triclinic was obtained. The crystal structure of the obtained samples was investigated by X-ray diffraction which assured the obtained data and the average crystallite size of as-prepared and annealed CTS was found to be 18.42 and 31.6 nm, respectively. Scanning electron microscopy (SEM) showed that the surface morphology has the shape of flower like consisted of nanoflakes. The transmission electron microscope (TEM) displayed the formation of sheets. The band gap was measured using UV-Vis absorption spectroscopy and found that the as-prepared sample has 1.97 eV band gap, which obtained for various phases CuS and SnS. However, this band was changed to 1.26 eV upon the heat treatment at 500°C for 10 minutes. This value of Eg is comparable with the value reported by other literatures.
Authors: Wei Wei He, Hui Min Jia, Yan Lei
Abstract: In this paper, we fabricated the CdS nanocrystals film on indium-tin oxide (ITO) glass substrates through one-step solvothermal treatment of cadmium nanocrystals layer and sulfur powder in the presence of absolute ethanol. And then we spin-coated a poly (3-hexylthiophene) (P3HT) layer in the CdS film, and finally evaporated an Au electrode through a shadow mask. The resulting products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscope (AFM). A photovoltaic performance measurement of the fabricated device (ITO/CdS:P3HT/Au) shows a short circuit current density (Jsc) of 0.82 mA cm2, and a power conversion efficiency (η) of 0.03% under an illumination of 100 mW/cm2.
Authors: Tie Kun Jia, Wei Min Wang, Zheng Yi Fu, Fei Huang, Hao Wang
Abstract: SnO2 nanocrystals with various morphologies were synthesized via a hydrothermal method assisting by the surfactant CTAB. The morphologies of the products were significantly dependent on the synthesis conditions. The products were characterized by X-ray diffraction (XRD) and field scanning electron microscopy (FESEM).The results showed products SnO2 nanoparticles and spheres like structure assembled with nanocones were obtained by varying the dosage of CTAB and the concentration of NaOH. The forming process of SnO2 sphere like structure was discussed and the proposed mechanism was put forward in this work.
Authors: Zhen Xiong Ma, Xing Kai Zhang, Qi Tao Zhang, Yan Jiang, Ping Liu, Jia Mei Ye, Jun Liang Liu, Ming Zhang
Abstract: In this paper, mono-dispersed cerium oxide nano powders have been synthesized via a mixed solvothermal route. The influences of solvents’ compositions and solvothermal temperatures on the crystallization of cerium oxide have been investigated. The results indicated that the formation temperature decreased when the mixed solvent was used and the existences of alcohols played as the reducing agents and delayed the crystallization of cerium oxide, which had great influences on both yield ratios and morphologies of the synthesized nano powders.
Authors: John A. Stride, Nam T. Tuong
Abstract: Recent interest in nanostructured titanium dioxide (TiO2) has been driven by the excellent photocatalytic and optical properties exhibited by the anatase and rutile phases. This article highlights the relationship between reaction conditions and the resultant nanostructured TiO2 and is primarily focused on wet chemical synthetic methods. We show that solvothermal syntheses of nano-TiO2 can be rationalised by making use of a diffusion-controlled model accounting for physical properties of the solvent such as the vapour-pressure, allowing the prediction and control the phase, size and type of nanostructured TiO2 product. This external control makes it possible for the systematic synthesis of TiO2 nanostructures via parameters such as the solvent chain length, the reaction temperature and time, and also by the addition of surfactants, providing the ability to design and tailor the nanostructured TiO2, which is vital for the optimal application of these nanostructures in photocatalytic or optical applications.
Authors: Pradeep Reddy Vanga, S. Leelashree, Mahalingam Ashok
Abstract: In the present work, we have reported the effect of cobalt concentration on Bi0.95Ba0.05Fe1-xCoxO3 (where x = 0.01, 0.03, 0.05) synthesis by solvothermal method. The structural properties are studied using X-ray diffraction by performing Rietveld analysis. The change in magnetic properties is associated with bond angle. The leakage current density mechanism is studied by measuring I-V characteristics.
Authors: Yusoff M.S. Meor, Muslimin Masliana, Paulus Wilfred
Abstract: Black aluminium dross produced from a local aluminium smelting plant was used in this study. Solvothermal method was used to produce nanostructured alumina from this waste. Initial product obtained is of low quality with 86.9% Al2O3 content and mixed crystalline phases of 71% α-alumina and 29% calcium dodeca aluminate (CaO(Al2O3)6). The introduction of the fractional precipitation stage into the process helps in improving the purity of the alumina product to 96.5% and also produces 100% α-alumina crystalline phase. The study also shows that the crystallite size of the α-alumina products produced from this process is less than 100nm.
Authors: Z. F. Zi, Y. N. Liu, Q.C. Liu, Jian Ming Dai, Yu Ping Sun
Abstract: Magnetite (Fe3O4) nanobranches were synthesized using an improved solvothermal technique in mixed ethanol and water solvent. Structural and magnetic properties were systematically investigated. X-ray diffraction results showed that the sample was single-phase spinel structure. The results of scanning electronic microscopy exhibited that the grains were regular like-branch with sizes from 3 to 6 μm in length and in diameter between 50 and 200 nm. The composition determined by energy dispersive spectroscopy was very close to the stoichiometry of Fe3O4. The saturation magnetizations (Ms) at 10 and 300 K of the synthesized Fe3O4 nanobranches were much lower than the theoretical values. On one hand, it could be explained by obstructive magnetizing along their non-easy magnetic axes by the shape anisotropy of Fe3O4 nanobranches, on the other hand, lesser Ms can also be understood by the existence of antisite defects.
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