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Preparation method of alpha-Fe2O3/TiO2 nano-composite gas sensing material

A gas-sensing sensing material and nano-composite technology, which is applied in the field of preparation of α-Fe2O3/TiO2 nano-composite gas-sensing sensing materials, to achieve the effect of strong theory, strong sensitivity and good gas-sensing characteristics

Inactive Publication Date: 2017-03-22
SUIHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a kind of α-Fe 2 o 3 / TiO 2 A method for preparing nanocomposite gas-sensing sensing materials, aiming to solve the problem of improving the characterization and sensing sensitivity of nanocomposite materials to trimethylamine gas sensitivity

Method used

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  • Preparation method of alpha-Fe2O3/TiO2 nano-composite gas sensing material
  • Preparation method of alpha-Fe2O3/TiO2 nano-composite gas sensing material
  • Preparation method of alpha-Fe2O3/TiO2 nano-composite gas sensing material

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preparation example Construction

[0024] A kind of α-Fe that the embodiment of the present invention provides 2 o 3 / TiO 2 A method for preparing a nanocomposite gas-sensing sensing material, comprising the steps of:

[0025] Step 1. TiO 2 Preparation of nanofibers: Using tetrabutyl titanate, glacial acetic acid, absolute ethanol and polyvinylpyrrolidone PVP as raw materials, TiO was prepared by electrospinning technology. 2 / PVP composite nanofiber film, obtained TiO after calcination 2 Nanofibers;

[0026] Step 2. α-Fe 2 o 3 / TiO 2 Preparation of nanocomposite gas-sensing sensing materials: first FeCl 3·6H 2 O was dispersed into the mixed solution of deionized water and ammonia water, stirred for 10-20min, then the obtained mixed solution was transferred to a hydrothermal kettle, and the TiO prepared above was added 2 For nanofiber materials, heat the hydrothermal kettle to 95°C, react for 4h, then cool the hydrothermal kettle to room temperature, centrifuge the precipitate in the reactor with etha...

Embodiment 1

[0034] Example 1: α-Fe 2 o 3 / TiO 2 Preparation of Nanocomposite Gas Sensing Materials

[0035] First prepare the required TiO 2 nanofibers, as follows:

[0036] Mix 2g of tetrabutyl titanate with 2g of glacial acetic acid and 7.5g of ethanol, then add 0.5g of PVP to the resulting mixed solution, and stir in a constant temperature hydrothermal kettle at 98°C for 2 hours to obtain a uniform spinning solution. silk solution, cooled to room temperature, and then prepared TiO by electrospinning 2 / PVP composite nanofiber film, the prepared film was calcined at 500°C for 2h to obtain the product TiO 2 nanofiber, spare;

[0037] Preparation of TiO by Electrospinning Technology 2 / PVP composite nanofiber film, the main equipment used is a sputtering electrospinning device and a hanger-type uniform distributor; the specific operations are as follows:

[0038] 1) Pour the configured uniform spinning solution into the hydrothermal kettle, and control the liquid level of the spin...

Embodiment 2

[0045] Example 2: α-Fe 2 o 3 / TiO 2 Preparation of Nanocomposite Gas Sensing Materials

[0046] Prepare TiO according to the method of Example 1 2 nanofibers, then 0.338gFeCl 3 ·6H 2 O was dispersed into a mixed solution of 20mL deionized water and 0.05mL ammonia water, stirred for 15min, the mixed solution was transferred to a hydrothermal kettle, and then 0.01gTiO 2 The nanofiber material was put into a hydrothermal kettle, and the hydrothermal kettle was heated to 95° C. for 4 hours. Finally, the hydrothermal kettle was cooled to room temperature, and the precipitate in the reaction kettle was centrifuged several times with a mixed solution of deionized water and ethanol, and dried at 60°C for 24h, and then the material was calcined at 500°C for 2h to obtain the final product .

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Abstract

The invention discloses a preparation method of an alpha-Fe2O3 / TiO2 nano-composite gas sensing material. The preparation method comprises the following steps: dispersing FeCl3.6H2O into a mixed solution of deionized water and ammonia water; stirring for 10 to 20 minutes; transferring the obtained mixed solution into a hydrothermal reactor; adding a prepared TiO2 nanofiber material; heating the hydrothermal reactor to be 95 DEG C for reacting for 4 hours; cooling the hydrothermal reactor to a room temperature; centrifuging sediment in the reactor with an ethanol solution repeatedly; drying at the temperature of 55 to 65 DEG C for 24 hours; calcining the material at the temperature of 500 DEG C for 2 hours to obtain the alpha-Fe2O3 / TiO2 nano-composite gas sensing material. In the preparation method, the alpha-Fe2O3 / TiO2 nano-composite gas sensing material prepared by combination of an electrostatic spinning technology and a hydrothermal method has a one-dimensional dentritic heterostructure, and can show a high gas sensing characteristic.

Description

technical field [0001] The present invention relates to the technical field of nanomaterials, more specifically to a kind of α-Fe 2 o 3 / TiO 2 A method for preparing a nanocomposite gas-sensing sensing material. Background technique [0002] With the advancement of science and technology, people have more and more understanding of the microcosm. Nanomaterials and nanocomposites have attracted widespread attention due to their unique physical and chemical properties and potential applications in various fields. In recent years, in the field of gas sensing, the development of nanotechnology has injected new vitality into the research of sensitive materials and the design of material microstructures. Metal oxide semiconductor nanocomposites have broad application prospects in the field of sensors. However, traditional single metal oxide semiconductor sensitive materials have disadvantages such as low sensitivity, poor selectivity, and poor resistance to environmental inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01G23/053G01N33/00
CPCC01G49/06C01G23/053C01P2002/74C01P2004/10G01N33/0004
Inventor 郑贵金
Owner SUIHUA UNIV
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