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Preparation method and application of a tubular tungsten oxide-graphene composite material

A composite material, tungsten oxide technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, electrical devices, etc., to achieve wide application prospects, easy operation, and excellent temperature-sensitive properties.

Inactive Publication Date: 2019-03-26
NO 49 INST CHINESE ELECTRONICS SCI & TECH GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no relevant literature in the existing technology to report a preparation method of a tubular tungsten oxide-graphene composite material and its application as a temperature-sensitive characteristic material for a temperature sensor.

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  • Preparation method and application of a tubular tungsten oxide-graphene composite material
  • Preparation method and application of a tubular tungsten oxide-graphene composite material
  • Preparation method and application of a tubular tungsten oxide-graphene composite material

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specific Embodiment approach 1

[0024] Specific embodiment one: the preparation method of a kind of tubular tungsten oxide-graphene composite material of this embodiment is carried out according to the following steps:

[0025] One, the graphite powder is oxidized by the improved Hummers method to obtain graphite oxide powder;

[0026] 2. Ultrasonic disperse the graphite oxide powder obtained in step 1 in n-propanol, the ultrasonic frequency is 35kHz-45kHz, and the ultrasonic time is 0.5h-1.5h to obtain a dispersion solution, and then add tungsten hexachloride to the dispersion solution, wait After the tungsten hexachloride is completely dissolved, transfer the solution into the reactor for hydrothermal reaction to obtain a mixed solution; wherein the hydrothermal reaction temperature is 150-250°C, and the hydrothermal reaction time is 10h-14h;

[0027] The mass ratio of graphite oxide powder described in step 2 to n-propanol is 1 mg to 5 mg: 3 mL;

[0028] The volume ratio of the amount of tungsten hexachl...

specific Embodiment approach 2

[0031] Specific embodiment two: what this embodiment is different from specific embodiment one is: the specific process that the improved Hummers method is carried out oxidation to graphite in the step one is: 1. graphite powder is mixed with sodium nitrate, then add the concentrated sulfuric acid, stir in ice bath 1h, mixed solution A is obtained; the mass ratio of the graphite powder to sodium nitrate is 5:1.5; the mass ratio of the graphite powder to the concentrated sulfuric acid is 2g:67.5mL; Add potassium permanganate at a rate of 9g / h in the mixed solution A, continue the ice bath for 2h, then transfer to a water bath, and react for 120h at room temperature to obtain mixed solution B; the potassium permanganate and step 1. The mass ratio of described graphite powder is 9:2; 3. add the sulfuric acid that mass fraction is 5% in the mixed solution B that step 2. obtains, stir 2h, obtain mixed solution C; Described mass fraction is the sulfuric acid of 5% and step The volum...

specific Embodiment approach 3

[0032] Embodiment 3: This embodiment differs from Embodiment 1 to Embodiment 2 in that the volume ratio of the graphite oxide powder described in step 2 to n-propanol is 1 mg: 1 mL. Other steps and parameters are the same as those in the specific embodiment 1 to 2.

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Abstract

A preparation method and an application of a tubular tungsten oxide-graphene composite material are disclosed. The invention belongs to the technical field of advanced materials, and specifically relates to a preparation method and an application of a tubular tungsten oxide-graphene composite material. The invention aims to enhance the temperature sensitivity of a graphene material by preparing a tungsten oxide-graphene composite material. The method comprises the following steps: (1) oxidizing graphite into graphite oxide powder; (2) ultrasonically dispersing the graphite oxide powder in normal propyl alcohol, and adding tungsten hexachloride for hydrothermal reaction; and (3) adjusting the pH value to 9-10, adding 50% aqueous solution of hydrazine hydrate, conducting reaction in oil bath, and carrying out centrifugal cleaning and drying after reaction to get black powder, namely, the tubular tungsten oxide-graphene composite material. The material can be used as a temperature-sensitive material of temperature sensors, a sensitive material of gas sensors or a photocatalytic degradation material.

Description

technical field [0001] The invention belongs to the technical field of advanced materials, and in particular relates to a preparation method and application of a tubular tungsten oxide-graphene composite material. Background technique [0002] As a typical transition metal oxide, tungsten oxide has potential application value in the fields of gas sensing and catalytic degradation. Different tungsten oxide nanostructures have been prepared by different synthesis methods: nanoclusters, nanorods, nanobelts, nanotubes, etc., which have been applied in some fields. However, there are still defects in the performance characteristics of pure tungsten oxide nanomaterials, which limit its application. [0003] Graphene with a single-layer carbon atom structure has a specific surface area of ​​up to 2600m 2 / g, the structure is very stable and has excellent conductivity. By compounding tungsten oxide and graphene materials, taking advantage of their respective characteristics, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/00B01J23/30
CPCB01J23/30G01K7/00
Inventor 杨永超秦浩王洋洋金鹏飞刘继江周明军吴亚林
Owner NO 49 INST CHINESE ELECTRONICS SCI & TECH GRP
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