Hydrothermal Synthesis of Sb 2

Crystalline antimony sulfide (Sb2S3) with nanorods morphology was successfully prepared via hydrothermal method by the reaction of elemental sulfur, antimony, and iodine as starting materials with high yield at 180∘C for 24 h. Using oxidation reagent like iodine as an initiator of redox reaction to prepare Sb2S3 is reported for first time. The powder X-ray diffraction pattern shows the Sb2S3 crystals belong to the orthorhombic phase with calculated lattice parameters, a=1.120 nm, b=1.128 nm, and c=0.383 nm. The quantification of energy-dispersive X-ray spectrometry analysis peaks gives an atomic ratio of 2 : 3 for Sb : S. TEM and SEM studies reveal the appearance of the as-prepared Sb2S3 is rodlike which is composed of nanorods with the typical width of 50–140 nm and length of up to 4 μm. The PL emission indicates that band gap of Sb2S3 is around 2.50 ev, indicating a considerable blue shift relative to the bulk. A formation mechanism of Sb2S3 nanostructure is proposed

Sol Sol-gel synthesis, structural and optical properties investigation of Ce4+ doped CdO sub-micron materials

Highly crystalline Ce4+ -doped cadmium oxide sub-micron structures were synthesized by calcinations of the obtained precursor of a sol-gel reaction. The reaction was carried out with cadmium nitrate (Cd(NO3)2.4H2O), cerium nitrate Ce(NO3)4.6H2O and ethylene glycol (C2H6O2) reactants without any additive at 80°C for 2h. Resulting gel was calcined at 900 °C with increasing temperature rate of 15°C per minute for 12 h in a furnace. As a result of heating, the organic section of the gel was removed and Ce4+ - doped cadmium oxide micro structure was produced. The obtained material synthesized from the sol-gel technique, possesses a cubic crystalline structure at micro scale. X-ray diffraction (XRD) study indicates that the obtained Ce4+ -doped CdO has a cubic phase. SEM images showed that the resulting material is composed of particles with cluster structure. Other two techniques FT-IR and UV-Vis spectroscopies were employed for further characterization of the Ce4+ -doped CdO micro structures. Downloaded from 78.38.150.28 at 1:07 IRDT on Thursday May 25th 2017 K e

Synthesis and Characterization of Sb2S3 Nanorods via Complex Decomposition Approach

Based on the complex decomposition approach, a simple hydrothermal method has been developed for the synthesizing of Sb2S3 nanorods with high yield in 24 h at 150∘C. The powder X-ray diffraction pattern shows the Sb2S3 crystals belong to the orthorhombic phase with calculated lattice parameters a=1.120 nm, b=1.128 nm, and c=0.383 nm. The quantification of energy dispersive X-ray spectrometric analysis peaks give an atomic ratio of 2 : 3 for Sb : S. TEM and SEM studies reveal that the appearance of the as-prepared Sb2S3 is rod-like which is composed of nanorods with the typical width of 30–160 nm and length of up to 6 μm. High-resolution transmission electron microscopic (HRTEM) studies reveal that the Sb2S3 is oriented in the [10-1] growth direction. The band gap calculated from the absorption spectra is found to be 3.29 ev, indicating a considerable blue shift relative to the bulk. The formation mechanism of Sb2S3 nanostructures is proposed

Investigation of lithium silicate compounds stability by means of x-ray diffraction method (XRD)

In this work, the comprision of phase stability of lithium silicates in the ratios of Li:Si 1:2 and 1:3 from the raw materials of lithium nitrate and silicic acid and in the ratio of Li:Si 1:2 from the raw materials of lithium sulphate and silicic acid in the temperatures of 48, 72, 96 and 120 h with using x-ray diffraction method was performed. Also, we calculated inter planar spacing (d) of the synthesized materials with using Braggs equation. Synthesized materials sizes were calculated via scherrer equation in different phases and in different Li:Si molar ratios. Cell parameters of lithium metasilicate are a=9.392, b=5.397 and c=4.66 Ã and the parameters for lithium disilicate are a=15.82, b=14.66 and c=4.79Ã. Cell parameters of lithium sodium silinaite are a=5.06, b=8.23 and c=14.38Ã with space group of A2/n. Results show that lithium metasilicate and lithium disilicate have space groups of Cmc21 and Ccc2, respectively

Structural Studies and Optical and Electrical Properties of Novel -Doped Nanorods

Gd3+-doped Sb2Se3 nanorods were synthesized by coreduction method at 180°C and pH=12 for 48 h. Powder XRD patterns indicate that the GdSb2−Se3 crystals (=0.00–0.04) are isostructural with Sb2Se3. The cell parameters a and b increase for Gd3+ upon increasing the dopant content (x), while c decreases. SEM images show that doping of Gd3+ ions in the lattice of Sb2Se3 results in nanorods. High-resolution transmission electron microscopic (HRTEM) studies reveal that the Gd0.04Sb1.96Se3 is oriented in the [10-1] growth direction. UV-Vis absorption reveals mainly electronic transitions of the Gd3+ ions in doped nanomaterials. Emission spectra of doped materials show sharp emission band originating from f-f transition 6P7/2→8S7/2 of the Gd3+ ions. The electrical conductance of Gd-doped Sb2Se3 is higher than undoped Sb2Se3 and increases with temperature

Block Copolymer-Assisted Solvothermal Synthesis of Hollow Bi₂MoO₆ Spheres Substituted with Samarium

Hollow spherical structures of ternary bismuth molybdenum oxide doped with samarium (Bi_2–<i>x</i>Sm_<i>x</i>MoO₆) were successfully synthesized via development of a Pluronic P123 (PEO₂₀-PPO₇₀-PEO₂₀)-assisted solvothermal technique. Density functional theory calculations have been performed to improve our understanding of the effects of Sm doping on the electronic band structure, density of states, and band gap of the material. The calculations for 0 ≤ <i>x</i> ≤ 0.3 revealed a considerably flattened conduction band minimum near the Γ point, suggesting that the material can be considered to possess a quasi-direct band gap. In contrast, for <i>x</i> = 0.5, the conduction band minimum is deflected toward the U point, making it a distinctly indirect band gap material. The effects of a hollow structure as well as Sm substitution on the absorbance and fluorescence properties of the materials produced increased emission intensities at low Sm concentrations (<i>x</i> = 0.1 and 0.3), with <i>x</i> = 0.1 displaying a peak photoluminescence intensity 13.2 times higher than for the undoped bulk sample. Subsequent increases in the Sm concentration resulted in quenching of the emission intensity, indicative of the onset of a quasi-direct-to-indirect electronic band transition. These results indicate that both mesoscale structuring and Sm doping will be promising routes for tuning optoelectronic properties for future applications such as catalysis and photocatalysis