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Method for preparing WO3.H2O hollow sphere assembled by nanosheets

A technology of hollow spheres and nanosheets, which is applied in the field of preparing nanosheet-assembled WO3·H2O hollow spheres, which can solve the problem that the template is difficult to completely remove and clean, and achieve the effects of uniform size, good dispersion, and strong hollowness

Active Publication Date: 2015-01-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, solid spheres of insoluble salts such as lead tungstate, strontium tungstate, and calcium tungstate were used as templates to prepare WO 3 ·H 2 O hollow spheres, but the disadvantage of this method is that the template is difficult to completely remove, and the final hollow spheres often have impurities of insoluble salts

Method used

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  • Method for preparing WO3.H2O hollow sphere assembled by nanosheets
  • Method for preparing WO3.H2O hollow sphere assembled by nanosheets
  • Method for preparing WO3.H2O hollow sphere assembled by nanosheets

Examples

Experimental program
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Effect test

Embodiment 1

[0043]Under magnetic stirring, add 1mmol oxalic acid and 0.5mmol sodium tungstate to 30mL water, add 36mL propanol to the above aqueous solution to form a mixed solvent of propanol and water, then add 24mmol hydrochloric acid to the above mixed solvent solution, and introduce the resulting solution into 90mL A volumetric polytetrafluoroethylene-lined reaction vessel was incubated at 100°C for 6 hours to obtain a deposit. Then, the obtained sediment was washed several times with ethanol and water respectively, so that there was no residue on the sediment, and after drying, WO was obtained. 3 ·H 2 O powder, the sample is marked as A.

[0044] Adopt the Leo-Supra55 type scanning electron microscope of Carl Zeiss Company of Germany and the 2100 type transmission electron microscope of JEOL to observe the morphology and structure of the sample, as Figure 1(a) , (b) are the SEM and TEM photos of the samples, respectively. As a result, it can be seen that the obtained WO 3 ·H 2 ...

Embodiment 2

[0047] The difference from Example 1 is that under magnetic stirring, 1mmol oxalic acid and 0.5mmol potassium tungstate are added to 30mL water, 36mL propanol is added to the above aqueous solution to form a mixed solvent of propanol and water, and then 12mmol sulfuric acid is added to the above The solvent solutions were mixed, and the resulting solution was introduced into a 90-mL polytetrafluoroethylene-lined reaction kettle, and kept at 50° C. for 24 hours to obtain a deposit. Then, the obtained sediment was washed several times with ethanol and water respectively, so that there was no residue on the sediment, and after drying, WO was obtained. 3 ·H 2 O powder, the sample is marked as B.

[0048] Adopt the transmission electron microscope identical with embodiment 1 to observe sample shape, as figure 2 TEM photo of the sample. As a result, it can be seen that the obtained WO 3 ·H 2 O is a hollow sphere assembled by nanosheets, and its diameter is about 1.8 μm; the de...

Embodiment 3

[0050] The difference from Example 1 is that under magnetic stirring, 1mmol oxalic acid and 0.5mmol potassium tungstate were added to 32mL water, 36mL propanol was added to the above aqueous solution to form a mixed solvent of propanol and water, and then 20mmol nitric acid was added to the above The solvent solutions were mixed, and the resulting solution was introduced into a 90 mL polytetrafluoroethylene-lined reaction kettle, and kept at 70° C. for 10 hours to obtain a deposit. Then, the obtained sediment was washed several times with ethanol and water respectively, so that there was no residue on the sediment, and after drying, WO was obtained. 3 ·H 2 O powder, the sample is marked as C.

[0051] Adopt the transmission electron microscope identical with embodiment 1 to observe sample shape, as image 3 TEM photo of the sample. As a result, it can be seen that the obtained WO 3 ·H 2 O is a hollow sphere assembled by nanosheets, and its diameter is about 2.3 μm; the de...

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Abstract

The invention belongs to the field of functional nano materials, and particularly relates to a method for preparing a WO3.H2O hollow sphere assembled by nanosheets. The method comprises the steps of dissolving oxalic acid and tungstate into water, and adding propyl alcohol to obtain the solution of mixed solvent; then, adding strong acid, and carrying out thermostatic reaction in a reaction kettle to obtain precipitate; washing the precipitate by ethyl alcohol and water, and drying to obtain WO3.H2O powder. The WO3.H2O hollow sphere assembled by the nanosheets can be prepared by a reagent system under the proper reaction conditions, and the WO3.H2O hollow sphere is good in dispersibility, uniform in size and good in hollow degree. In the whole process, a template is not used, so that the problem that residual impurities exist in the preparation adopting a template method can be effectively solved; the preparation process is simple and high in controllability, so that the method has good application prospect.

Description

technical field [0001] The invention belongs to the field of functional nanomaterials, in particular to a nanosheet-assembled WO 3 ·H 2 O hollow ball method. Background technique [0002] WO x (x≤3) is a class of functional materials that have been widely studied. Because of their unique physical and chemical properties, they are widely used in electrochromic devices, dye-sensitized solar cells, photocatalysis, optical recording devices, sensing, field emission, high-temperature ultra- It has a wide range of applications in guiding and other fields. The performance of the material has a great relationship with its structure and morphology, WO 3 ·H 2 O is synthesized from WO by liquid phase x An intermediate material, itself is also an important semiconductor material, its morphology and structure determine the WO x The important factors of morphology and structure also indirectly determine the WO x performance. Therefore, the preparation of WO with a special structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02B82Y40/00
Inventor 李琦尚建库刘扬
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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