- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Effect of the zinc salt concentration on the ZnO thin films properties grown by MWCBD
摘要： Nanostructured ZnO thin films with different surface morphologies have been synthesized by the microwave assisted chemical bath deposition technique (MWCBD), adjusting the pH of the reaction solution between 9 and 11.14. Newest results are presented in this work supported by previous investigations. Morphology, structure and optical properties of the films have been studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and room temperature photoluminescence (PL) techniques. It has been observed that the zinc salt concentration and the pH of the reaction solution determines the reaction kinetics, affecting strongly the morphology of the final product. However, the rapid heating in microwave irradiation process facilitates the crystallization of the formed nano-/microstructures. Effects of composition and morphology of the grown nano-/microstructures on their photoluminescence (PL) behaviors have been discussed.
关键词： Optical properties,Microwave deposition,ZnO nanostructures,Morphology control
更新于2025-09-10 09:29:36
-
CaF<sub>2</sub> Nanocrystals Synthesis That Have a Unique Shape
摘要： CaF2 nanocrystals with a clear cubic shape were synthesized using both simple mixing and a hydrothermal method that neither of which required the use of surfactants or dispersants. The concentration and pH of the reaction medium, which in this case was an aqueous HNO3 solution, was found to be very important for determining the morphology of the CaF2 particles.
关键词： nanocrystal,solvothermal reaction,CaF2,morphology control
更新于2025-09-10 09:29:36
-
Large-scale uniform fabrication and morphology control of ultrafine perovskite nanocrystals
摘要： Nanomaterials are playing more and more important roles in modern industry, while the large-scale fabrication and dispersibility still need to be addressed. This report explores the uniform fabrication and morphology control of ultrafine BaTiO3 (BT) nanocrystals using a "TEG-sol" method. By varying the reactant concentration, the obtained product sols, Ba/Ti ratios, structure and morphology of the nanocrystals are investigated. The results reveal that under low concentrations (0.4 - 0.8 mol/L), transparent sols with uniform BT nanocrystals are obtained. Increasing the concentration to higher than 1.0 mol/L, BT precipitates with abnormal large crystals are obtained. Moreover, the Ba/Ti ratio variation further reveals that the surface organics are critical to the control of crystal size and morphology. This investigation is potential to be extended to the synthesis of various perovskite nanocrystals.
关键词： morphology control,Nanomaterials,BaTiO3,TEG-sol method,perovskite nanocrystals
更新于2025-09-10 09:29:36
-
Synthesis and Morphological Control of Mesoporous SiO2 with Cotton as Bio-Template
摘要： Mesoporous SiO2 with special short open axis-like morphology was successfully fabricated by using cotton fibers as bio-templates. Mesostructure and morphology of the samples were systematically studied by changing the cotton/SiO2 weight ratio and hydrothermal treating temperature. Textural property and morphology of the obtained mesoporous SiO2 were characterized by the combination of X-ray diffraction, N2 adsorption-desorption experiments and scanning electron microscope. Finally, batch adsorption of methylene blue was performed to detect the adsorption capacity of the cotton co-templated materials.
关键词： Cotton,SBA-15,Morphology control,Bio-template
更新于2025-09-09 09:28:46
-
Composition, Morphology, Structure and Photocatalytic Performances of Photocatalysts Prepared from Titanium Potassium Oxalate
摘要： In this work, different products were synthesized using potassium titanium oxalate as the precursor when the reaction conditions varied. The influences of reaction system conditions on the formation features, particle size, phase composition, morphology and properties of the products were investigated and discussed. The XRD and SEM results indicated that TiO2 with different morphology and particle size were prepared by a hydrothermal treatment of the reaction system including HCl and H2O2 solution, and its degradation rate reached 100% after 100 min under UV irradiation. However, under the conditions without H2O2, a new product C2O7Ti2·3H2O with a large crystal of hexagonal prism was synthesized. Photocatalytic degradation of methyl orange (MO) indicated that C2O7Ti2·3H2O exhibited high photocatalytic activity. And the results of the active species detection show that ?O2? was the main reactive species for MO degradation. The formation mechanism of the product prepared by different reaction system was also discussed.
关键词： Titanium potassium oxalate,Morphology control,Photocatalytic activity,C2O7Ti2·3H2O,TiO2
更新于2025-09-09 09:28:46