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Nanometer porous tungsten trioxide material and its Preparation and application

A tungsten trioxide and nanomaterial technology, which is applied in the growth of polycrystalline materials, chemical instruments and methods, crystal growth, etc., can solve the problem that the photoelectric properties of porous tungsten trioxide nanomaterials have not been better applied, and achieve good results. Photoelectrochemical properties, uniform distribution of pores, and easy manipulation

Inactive Publication Date: 2009-07-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the study of the photocatalytic ability of tungsten trioxide combined with the morphology and crystal orientation of the material so far.
The optoelectronic properties of porous tungsten trioxide nanomaterials have not been better applied due to the fact that the morphology is regular and has a specific crystal orientation.

Method used

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  • Nanometer porous tungsten trioxide material and its Preparation and application
  • Nanometer porous tungsten trioxide material and its Preparation and application
  • Nanometer porous tungsten trioxide material and its Preparation and application

Examples

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Embodiment 1

[0029]Example 1 Cut the tungsten sheet into a size of 25×50mm, and then polish it successively with sandpaper of 400 mesh, 600 mesh, 800 mesh, 1000 mesh and 1200 mesh respectively, and connect it with a wire to make an electrode; place the tungsten sheet in acetone, Ultrasonic cleaning in isopropanol, methanol and deionized water, and drying with nitrogen; mix 0.2wt% sodium fluoride (NaF) and 0.3% (V / V) hydrofluoric acid (HF) in a ratio of 1:1 After pouring into the electrolytic cell, the concentration of fluoride ion in the electrolyte is 0.11mol / L, and the concentration of hydrogen ion is 0.086mol / L. With tungsten sheet as anode and platinum electrode as cathode, control the temperature of the electrolyte at 20±1°C, first oxidize at 60V for 60 minutes, and then oxidize at 40V for 30 minutes; oxidize the tungsten sheet with diluted Soak in hydrofluoric acid for a few seconds and rinse with deionized water; finally calcined at 450°C for 4h in an oxygen atmosphere. The scannin...

Embodiment 2

[0031] Embodiment 2 By the preparation method of the present invention of embodiment 1, just change electrolytic solution into 0.6wt% sodium fluoride (NaF) and 0.5mol / L sulfuric acid (H 2 SO 4 ) in a ratio of 1:1, that is, the concentration of fluoride ions is 0.07mol / L, and the concentration of hydrogen ions is 0.5mol / L. Porous tungsten trioxide nanomaterials with a self-assembled structure were obtained, the average pore diameter was about 100 nm, and the crystal structure was the same as in Example 1.

Embodiment 3

[0032] Embodiment 3 According to the preparation method of the present invention of embodiment 1, just change electrolytic solution into 1.0wt% ammonium fluoride (NH 4 F) Mix with 0.5mol / L hydrochloric acid (HCl) at a ratio of 1:1, that is, the concentration of fluoride ion is 0.24mol / L, and the concentration of hydrogen ion is 0.25mol / L. Porous tungsten trioxide nanomaterials with a self-assembled structure were obtained, the average pore diameter was about 120 nm, and the crystal structure was the same as in Example 1.

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Abstract

The invention relates to a porous tungsten trioxide nanomaterial, which is a porous WO3 with a uniform structure formed by molecular self-assembly, with a pore diameter of 60nm to 150nm and uniform shape and regular arrangement. ) plane-oriented monoclinic crystal system. The preparation method of the tungsten trioxide nanomaterial is based on metal tungsten, and adopts the constant current anodic oxidation method. The electrolyte is composed of inorganic fluoride and inorganic strong acid, wherein the inorganic fluoride includes sodium fluoride, potassium fluoride or fluorine Ammonia, inorganic strong acids include hydrofluoric acid, hydrochloric acid or sulfuric acid, the concentration of fluoride ions in the electrolyte is 0.05-0.3mol / L, and the concentration of hydrogen ions is 0.05-0.5mol / L. The tungsten trioxide nanomaterial has strong photocatalytic ability and is a very efficient photocatalyst.

Description

Technical field: [0001] The invention relates to a preparation method of a tungsten trioxide nanometer material, in particular to a preparation method of a porous tungsten trioxide nanometer material based on metal tungsten. Background technique: [0002] Tungsten trioxide is a semiconductor nanomaterial with indirect bandgap transition, which has good photoelectric and gas-sensing properties. In order to make full use of the photoelectric properties of tungsten trioxide, it is necessary to prepare porous tungsten trioxide nanomaterials with regular shape and high specific surface area. Material. [0003] Electrochemical anodic oxidation is a low-cost method that can construct porous nanomaterials with adjustable pore size and regular shape on a large area. The basic principle is to use a high-purity metal as the anode, and another metal or Carbon is used as the cathode and placed in the electrolyte. Under the action of an external electric field, the ions in the electrolyt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B30/02C30B29/16C25D11/26
Inventor 全燮郭亚逢路莹赵慧敏陈硕
Owner DALIAN UNIV OF TECH
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