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Method for preparing WO3 nanocrystalline

A nanocrystal and nanoparticle technology, applied in the field of preparation of WO3 nanocrystal materials, can solve problems such as difficulty in large-scale production and complexity, and achieve the effects of low cost, easy operation, and simple and safe preparation method.

Inactive Publication Date: 2011-05-11
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flame spray method requires complex and expensive spray and flame control equipment, and it is difficult to carry out large-scale production.

Method used

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  • Method for preparing WO3 nanocrystalline
  • Method for preparing WO3 nanocrystalline

Examples

Experimental program
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Effect test

Embodiment 1

[0017] (1) Preparation of polytungstic acid polyperoxide precursor: prepare polytungstic acid polyperoxide solution by reacting 5.4g tungsten powder with 40ml 30% hydrogen peroxide solution;

[0018] (2) Preparation of polyperoxytungstic acid composite sol with added surfactant: Weigh 3g of P123 (average molecular weight is 5800) and dissolve it in absolute ethanol, add to the W-containing solution prepared in (1) 6+ 0.01mol polyperoxytungstic acid solution, and reflux at 80°C for 2 hours to fully compound, and finally obtain a slightly viscous dark blue composite sol;

[0019] (3) WO 3 Preparation of nanocrystals: the composite sol prepared in (2) is poured into Al 2 o 3 In the crucible, it is annealed and calcined at 450°C in a muffle furnace to completely burn off the organic matter, and finally the light yellow-green WO 3 nanoparticles.

Embodiment 2

[0021] (1) Preparation of polyperoxytungstic acid precursor: with 7g WO 3 The powder was reacted with 50ml 30% hydrogen peroxide solution to prepare polyperoxytungstic acid solution;

[0022] (2) Preparation of polyperoxytungstic acid composite sol with added surfactant: and weigh 5g of PVP (the average molecular weight is 10000) and dissolve it in absolute ethanol, add it to the W-containing solution prepared in (1). 6+ 0.01mol polytungstic acid polyperoxide solution, and reflux at 100°C for one hour, and finally a slightly viscous dark blue composite sol was obtained;

[0023] (3) WO 3 Preparation of nanocrystals: the composite sol prepared in (2) is poured into Al 2 o 3 In the crucible, it is annealed and calcined at 600°C in a muffle furnace to completely burn off the organic matter, and finally the light yellow-green WO 3 nanoparticles.

Embodiment 3

[0025] (1) Preparation of polyperoxytungstic acid precursor: with 6g WO 3 The powder is reacted with 43ml 30% hydrogen peroxide solution to prepare polyperoxytungstic acid solution;

[0026] (2) Preparation of polyperoxytungstic acid composite sol with added surfactant: Weigh 4.5g of F127 (average molecular weight is 12600) and dissolve it in absolute ethanol, add to the prepared in (1) containing W 6+ 0.008mol polytungstic acid polyperoxide solution, and reflux at 90°C for one and a half hours, and finally obtain a slightly viscous dark blue composite sol;

[0027] (3) WO 3 Preparation of nanocrystals: the composite sol prepared in (2) is poured into Al 2 o 3 In the crucible, it is annealed and calcined at 500°C in a muffle furnace to completely burn off the organic matter, and finally the light yellow-green WO 3 nanoparticles.

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Abstract

The invention discloses a method for preparing WO3 nanocrystalline. The method comprises the following steps: firstly preparing a poly tungstic acid peroxide solution by adopting a peroxidation method, adding a non-ionic surfactant, giving fully play to a precursor by refluxing, and finally carrying out direct high temperature calcination on the prepared sol, thus a high quality WO3 nanocrystalline material is obtained. The invention has the advantages that: the preparation method is simple, the cost is low, the prepared WO3 nanocrystalline has high crystallization quality and good dispersibility, and the industrial production in batch can be realized. The WO3 nanocrystalline material prepared by the invention is a gas-sensitive material with high detection performance to low concentration acetone, can be developed to be a detector material for acetone and can be especially applied to a device for diagnosing diabetes by adopting a breathing pattern.

Description

Technical field: [0001] The present invention relates to a WO 3 The preparation method of nanocrystalline material, the prepared WO 3 The nanocrystalline material can be applied to low-concentration acetone detection devices, especially to diagnostic devices for diabetics through breathing. Background technique: [0002] Acetone, also known as dimethyl ketone, is the simplest ketone in the series of saturated aliphatic ketones. Melting point -95 degrees, boiling point 56 degrees, it is a colorless, volatile and flammable liquid with a special smell. Mixing acetone vapor with air can form an explosive mixture with an explosion limit of 2.55% to 12.8% (volume). Although acetone has no special toxicity to the human body, it can cause headaches, bronchitis and other symptoms after inhalation. If a large amount of acetone is inhaled, it may also cause loss of consciousness. As one of the most common organic solvents, acetone is widely used in daily life and industrial product...

Claims

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Application Information

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IPC IPC(8): C01G41/02B82Y40/00
Inventor 史继超孙艳吴杰胡古今陈鑫戴宁
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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