Precious metal/base metal oxide/graphene ternary composite gas sensitive material and preparation method thereof

A technology of base metal oxide and composite material is applied in the field of noble metal/base metal oxide/graphene ternary composite gas sensitive material and its preparation, which can solve the problems of poor selectivity and stability of gas sensor, etc.

Active Publication Date: 2015-12-16
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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Problems solved by technology

[0005] Although metal oxide and noble metal composite gas sensing materials and graphene and metal oxide composite gas sensing materials have improved the stability and select

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  • Precious metal/base metal oxide/graphene ternary composite gas sensitive material and preparation method thereof
  • Precious metal/base metal oxide/graphene ternary composite gas sensitive material and preparation method thereof
  • Precious metal/base metal oxide/graphene ternary composite gas sensitive material and preparation method thereof

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Example Embodiment

[0037] The second aspect of the present invention relates to a method for preparing a sensitive material according to the first aspect of the present invention, comprising:

[0038] Step A, after mixing the graphene oxide solution with the base metal salt solution and the noble metal salt solution in turn, the mixture of noble metal / base metal oxide / graphene precursor is obtained through centrifugation;

[0039] In step B, the noble metal / base metal oxide / graphene precursor mixture is heat-treated (calcined), and then furnace-cooled (lower temperature) and annealed to obtain a gas-sensitive material.

[0040] In some embodiments of the present invention, the concentration of the graphene oxide solution is 5.04-5.88 mg / mL. Preferably, the concentration of the graphene oxide solution is 5.3-5.5 mg / mL. More preferably, the preferred concentration of the graphene oxide solution is 5.3 mg / mL.

[0041] In other embodiments of the present invention, the concentration of the base me...

Example Embodiment

[0064] Example 1: Preparation of noble metal / base metal oxide / graphene ternary composite gas sensitive material

[0065] (1) Preparation of graphene oxide:

[0066] Add 1g of graphite and 1g of sodium nitrate to 46mL of concentrated sulfuric acid, and stir in an ice bath for 3 minutes, then slowly add 6g of potassium permanganate. After 1 hour the reaction mixture was transferred to an oil bath at 35°C and stirred for 2 hours, after which the temperature was slowly raised to 60°C and stirred for another 2 hours. Finally, 200 mL of water was added to the reaction mixture and the temperature was raised to 90° C. and stirred for 5 hours. After the reaction was completed, 10 mL of hydrogen peroxide with a mass fraction of 30% was added thereto, and the color of the solution changed from yellow to brown. The solution was filtered slowly, washed with 5% hydrochloric acid, and then washed with deionized water. The filter cake was dissolved in deionized water, and graphene oxide was...

Example Embodiment

[0075] Example 2: Preparation of noble metal / base metal oxide / graphene ternary composite gas sensitive material

[0076] (1) The preparation method of graphene oxide is the same as embodiment 1.

[0077] (2) Preparation of noble metal / base metal oxide / graphene precursor mixture:

[0078] 5.5 g of graphene oxide prepared by the above method was added to 1 L of ethanol, and the mixture was sonicated for 90 minutes. 3.78 g of tin tetrachloride pentahydrate was dissolved in 19 mL of ethanol and 1 mL of the above graphene oxide solution was added. After the mixture was stirred for 5 h, 1 mL of ethanol solution of 12 mg / mL silver nitrate was added, and stirred for another 5 min. The obtained mixture was centrifuged at 8000 rpm for 5 min to obtain a noble metal / base metal oxide / graphene precursor mixture.

[0079] (3) Preparation of noble metal / base metal oxide / graphene ternary composite material:

[0080] The obtained noble metal / base metal oxide / graphene precursor mixture was c...

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Abstract

The invention relates to a precious metal/base metal oxide/graphene ternary composite gas sensitive material and a preparation method thereof. The preparation of the precious metal/base metal oxide/graphene ternary composite gas sensitive material is realized by a series of processes; the composition material is combined with excellent properties of various components; by using the composition material, the gas sensitive property of a sensor is further improved while the defects of low sensitivity, poor selectivity, high resistance and the like of a conventional metal oxide sensitive material are overcome; a gas sensitive sensor prepared from the ternary composite material is used for detecting acetone gas; compared with a sensor prepared from a metal oxide/graphene composite material and a metal oxide/precious metal semiconducting material as gas sensitive materials, the gas sensitive sensor prepared from the ternary composite material has the advantages of higher sensitivity, quicker response, shorter recovery time and higher selectivity and broader application prospect.

Description

technical field [0001] The invention belongs to the technical field of gas sensitive materials, and in particular relates to a noble metal / base metal oxide / graphene ternary composite gas sensitive material and a preparation method thereof. The invention also relates to a gas sensor based on noble metal / base metal oxide / graphene ternary composite gas sensitive material. Background technique [0002] As a "gas-electricity" information conversion device, the metal oxide semiconductor gas sensor has the advantages of fast detection speed and low cost. However, the pure phase of metal oxide semiconductors is a broad-spectrum sensitive material, which has disadvantages such as low sensitivity, poor selectivity, and high resistance. The development of modern technology has put forward higher requirements for metal oxide semiconductor gas sensors. The sensor not only has higher sensitivity, but also needs higher gas selectivity and stability. [0003] The traditional methods to im...

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Application Information

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IPC IPC(8): G01N27/12
Inventor 孙宇峰孟凡利葛胜赵丽洁
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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