Flower-like nano-WO3/graphene composite gas-sensitive material and preparation method and application thereof

A technology of graphene composite and gas-sensing materials, which is applied in the field of flower-shaped nano-WO3/graphene composite gas-sensing materials and its preparation, can solve the problems of rare aniline gas sensors, and achieve unique morphology, high yield and selectivity Good results

Inactive Publication Date: 2015-07-29
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few reports on gas sensors for aniline gas detection, and aniline gas sensors based on semiconductor nanomaterials are especially rare. Chinese patent ZL103336034A discloses an aniline gas sensor and its preparation method, which is a ZnS / PTCDA with a core-shell structure Spin-coated on insulating substrate materials such as silicon dioxide, silicon, glass, quartz, etc., to make a semiconductor gas sensor, which has high selectivity and sensitivity to aniline

Method used

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  • Flower-like nano-WO3/graphene composite gas-sensitive material and preparation method and application thereof

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Experimental program
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Embodiment 1

[0029] Flower-shaped Nano WO 3 / Preparation of graphene composite gas sensitive material and gas sensor (i.e. gas sensor)

[0030] 1. Preparation of gas-sensitive materials:

[0031] 1) Take 10ml of 1.146mg / ml graphene oxide solution, add deionized water to dilute to 80ml, ultrasonically disperse for 30min, weigh 2.0g Na 2 WO 4 2H 2 O, 3.40 g Na 2 SO 4 , 1.50g oxalic acid. Add the above-mentioned solid drug into the graphene oxide solution that has been ultrasonically dispersed, place it on a magnetic stirrer and stir evenly for 2 hours until the solid dissolves evenly.

[0032] 2) Add 2M dilute hydrochloric acid dropwise to the above homogeneous solution to make the pH of the solution reach 1.5, and then uniformly stir for 10 minutes. Then the above-mentioned stirred solution was transferred into a reaction kettle and heated by microwave. Set the reaction program, heat up to 180°C in 25 minutes, and hold for 40 minutes. The rotation speed is set to 400r / min, the magn...

Embodiment 2

[0042] Take 15ml of 0.726mg / ml graphene oxide solution, add deionized water to dilute to 80ml, ultrasonically disperse for 30min, weigh 1.5g Na 2 WO 4 ·2H 2 O, 3.00g Na 2 SO 4 , 1.00g oxalic acid. The above-mentioned solid drug was added to the ultrasonically dispersed graphene oxide solution, placed on a magnetic stirrer and stirred uniformly for 2 hours until the solid was uniformly dissolved. 1.5M dilute hydrochloric acid was added dropwise to the above uniform solution to make the pH of the solution reach 1.5, and then uniformly stirred for 20min.

[0043] Then the above-mentioned stirred solution was transferred into the reaction kettle and heated by microwave. The reaction program was set, the temperature was raised to 180° C. in 30 min, and the holding time was 60 min; the rotational speed was set to 450 r / min, the magnetic stirring device was adjusted, and the reaction was started. After the reaction was completed, it was cooled to room temperature naturally, the...

Embodiment 3

[0046] Take 30ml of 0.582mg / ml graphene oxide solution, add deionized water to dilute to 80ml, ultrasonically disperse for 20min, weigh 2.5g Na 2 WO 4 ·2H 2 O, 3.00g Na 2 SO 4 , 1.50g oxalic acid. The above-mentioned solid was added to the graphene oxide solution that had been dispersed by ultrasonic, and magnetic stirring was carried out for 1.5h. 1.0M dilute sulfuric acid was added dropwise to the above homogeneous solution to make the pH of the solution reach 1.0, and then uniformly stirred for 20 min.

[0047] The above-mentioned stirred solution was transferred into the reaction kettle, heated by microwave, and the reaction program was set, and the temperature was raised to 200° C. for 30 minutes, and the holding time was 40 minutes. The rotating speed was set to 400r / min, the magnetic stirring device was adjusted, and the reaction was started. After the reaction was completed, it was cooled to room temperature naturally, the obtained sample was centrifuged, washed ...

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Abstract

The invention discloses a flower-like nano-WO3/graphene composite gas-sensitive material and a preparation method and an application thereof. According to the invention, oxidized graphene and soluble tungsten salt are compounded by a microwave-stirring hydrothermal method so as to prepare the flower-like nano-WO3/graphene composite gas-sensitive material. The content of graphene in the nano-WO3/graphene composite gas-sensitive material is 0.1-1.0%. The nano-WO3/graphene composite gas-sensitive material provided by the invention has unique and uniform morphology, has high sensitivity to aniline gas and has good selectivity. Operating temperature is as low as 80 DEG C. The preparation method adopts microwave heating and stirring. The technology is advanced, reaction time is short and cost is low.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a flower-shaped nano WO 3 / Graphene composite gas-sensing material and its preparation method and application. Background technique [0002] Aniline is an important chemical raw material, mainly used in medicine and rubber vulcanization accelerator, and is also a raw material for the manufacture of resins and coatings. It is widely used in laboratories and industrial fields. It is flammable and the most toxic. Organic amines are very toxic to the blood and nerves, can be absorbed through the skin or cause poisoning through the respiratory tract, and can also cause methemoglobinemia, hemolytic anemia, and liver and kidney damage. Therefore, it is very important to quickly and accurately detect aniline gas in the environment. At present, there are few reports on gas sensors for aniline gas detection, and aniline gas sensors based on semiconductor nanomaterials are especially rare. Ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 桂阳海赵建波郭智荣谢冰王伟民
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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