Nano stannic oxide-graphene composite as well as preparation method and application thereof

A technology of nano-tin dioxide and composite materials, which is applied in the direction of tin oxide, etc., can solve the problems of response recovery time influence, low sensitivity and selectivity, and achieve fewer synthesis steps, simple operation methods, broad development prospects and practical application space Effect

Inactive Publication Date: 2016-08-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among oxides, SnO 2 The research is relatively mature, but undoped SnO 2 The sensitivity and selectivity are low, and the material generally obtains a good response at a temperature higher than 200°C, and the concentration of the detected gas also has a certain impact on its response recovery time

Method used

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  • Nano stannic oxide-graphene composite as well as preparation method and application thereof
  • Nano stannic oxide-graphene composite as well as preparation method and application thereof
  • Nano stannic oxide-graphene composite as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a nano-tin dioxide and graphene composite material capable of specifically responding to ammonia at room temperature, the specific steps are as follows:

[0038] (1) Seed crystal adsorption: take 20ml GO aqueous solution (2mg / ml) and add 10ml H 2 O in a total of 30ml solution ultrasonically dispersed for 30min. Analytical balance weighs a certain amount of SnCl 4 ·5H 2 O, added to the sonicated GO aqueous solution, so that the Sn 4+ The concentration is 0.005mol / L. Placed on a magnetic stirrer, fully stirred for 12 hours to make the surface of GO sheets adsorb Sn4+ Create active sites. The solid obtained after repeated stirring was washed twice with deionized water and ethanol respectively to remove excess ions. Dissolve the solid obtained after washing with 10ml of distilled water, and ultrasonicate for 15 minutes to obtain a brown uniform dispersion, which is used as a seed crystal adsorption solution for future use.

[0039] (2) Hydrother...

Embodiment 2

[0044] A method for preparing a nano-tin dioxide and graphene composite material with specific response to ammonia at room temperature, the specific steps are as follows:

[0045] (1) Seed crystal adsorption: Graphene oxide (GO) aqueous solution, measure GO aqueous solution (2mg / ml) containing different GO masses (5mg, 10mg, 20mg) and add 20ml H 2 O Ultrasonic dispersion for 30min. Analytical balance weighs a certain amount of SnCl 4 ·5H 2 O, added to different volumes of sonicated GO aqueous solution, so that Sn 4+ The concentration is 0.005mol / L. Placed on a magnetic stirrer, fully stirred for 12 hours to make the surface of GO sheets adsorb Sn 4+ Create active sites. The solid obtained after repeated stirring was washed twice with deionized water and ethanol respectively to remove excess ions. Dissolve the solid obtained after washing with 10ml of distilled water, and ultrasonicate for 15 minutes to obtain a brown uniform dispersion, which is used as a seed crystal ad...

Embodiment 3

[0049] A method for preparing a nano-tin dioxide and graphene composite material with specific response to ammonia at room temperature, the specific steps are as follows:

[0050] (1) Seed adsorption: Graphene oxide (GO) aqueous solution, take 20ml GO aqueous solution (2mg / ml) and add 20ml H 2 O Ultrasonic dispersion for 30min. Analytical balance weighs a certain amount of SnCl 4 ·5H 2 O was added to the sonicated GO aqueous solution, so that the Sn 4+ The concentration is 0.005mol / L. Placed on a magnetic stirrer, fully stirred for 12 hours to make the surface of GO sheets adsorb Sn 4+ Create active sites. The solid obtained after repeated stirring was washed twice with deionized water and ethanol respectively to remove excess ions. Dissolve the solid obtained after washing with 10ml of distilled water, and ultrasonicate for 15 minutes to obtain a brown uniform dispersion, which is used as a seed crystal adsorption solution for future use.

[0051] (2) Hydrothermal proc...

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Abstract

The invention relates to a nano stannic oxide-graphene composite as well as a preparation method and an application thereof. Firstly, a SnCl4*5H2O solution is added to a graphene oxide aqueous solution and stirred, graphene oxide sheets adsorb Sn<4+>,the graphene oxide sheets adsorbing Sn<4+> are dissolved in deionized water and subjected to ultrasonic treatment after being separated, and an obtained dispersing solution is used as a seed crystal adsorbing solution; a SnCl4*5H2O aqueous solution, a NaOH aqueous solution and a surfactant aqueous solution are prepared respectively; the seed crystal adsorbing solution and the SnCl4*5H2O aqueous solution are mixed, then the NaOH aqueous solution and the surfactant aqueous solution are dropwise added to the solution sequentially, the mixture is stirred, mixed evenly and ultrasonically and then transferred to a closed reaction kettle to be subjected to a hydrothermal reaction, and the nano stannic oxide-graphene composite is obtained after natural cooling, centrifugation, washing and drying. The nano stannic oxide-graphene composite is applied to specific response to ammonia gas under the room temperature condition. Compared with the prior art, the composite has the advantages that the synthesis method is simple and easy to implement, and the shape of a product is controlled.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, and in particular relates to a composite material of nanometer tin dioxide and graphene, a preparation method and application thereof. Background technique [0002] With the rapid development of modern society and the continuous advancement of urbanization, environmental pollution has become one of the biggest problems people face. Among the various environmental pollution problems that have emerged around the world, gas pollution is particularly harmful to human beings. The air quality is not up to standard, and many people die every year from gas poisoning, gas explosions and other accidents. Traditional detection methods for toxic and harmful gases include infrared absorption method, electrochemical analysis method, etc. These methods often have slow detection speed, complicated equipment and high cost. The introduction of sensors is to convert some physical and chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02
CPCC01G19/02C01P2002/72C01P2004/04C01P2004/16C01P2004/80
Inventor 陈云张雯吴庆生
Owner TONGJI UNIV
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