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A gold-modified porous tin dioxide micro-nano sheet composite material and its preparation method and application

A technology of tin dioxide and composite materials, applied in the field of nanomaterials, can solve the problems of inability to control the microstructure of tin dioxide, and achieve the effects of high crystallinity, high sensitivity and responsiveness, and large specific surface area.

Active Publication Date: 2022-06-07
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the prior art, the sol-gel method or hydrothermal method is mostly used to prepare heavy metal-doped tin dioxide nanomaterials. Although the composite materials prepared by these methods can improve the performance of gas sensors, they cannot control the performance of tin dioxide. Its own microstructure, how to regulate the microstructure of tin dioxide, design and synthesize noble metal-modified tin dioxide composite materials, and further improve the sensitivity of the sensor still needs to be continuously explored

Method used

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  • A gold-modified porous tin dioxide micro-nano sheet composite material and its preparation method and application
  • A gold-modified porous tin dioxide micro-nano sheet composite material and its preparation method and application
  • A gold-modified porous tin dioxide micro-nano sheet composite material and its preparation method and application

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Embodiment 1

[0046] A preparation method of a gold-modified porous tin dioxide micro-nano sheet composite material, comprising the following steps:

[0047] A. Dissolve stannous chloride dihydrate in a mixed solution of ethylene glycol and water with a volume ratio of 1:5 to prepare 20 milliliters of 0.1M stannous chloride solution;

[0048] Dissolve sodium hydroxide in water to prepare 10 ml of 0.2M sodium hydroxide solution;

[0049] The two solutions were heated to 30°C, and the above-mentioned sodium hydroxide solution was added to the stannous chloride solution under magnetic stirring at a rotational speed of 50 rpm, and then continued to stir at 30°C for 3 minutes to obtain a mixed suspension. , stand for 48 hours at 30°C to obtain a white precipitate, filter and wash the white precipitate, and dry at 40°C for 24 hours to obtain basic stannous chloride micro-nano sheets;

[0050] B. The basic stannous chloride micro-nano sheet is calcined at 800 ° C for 0.5 hour, and after cooling, ...

Embodiment 2

[0053] A preparation method of a gold-modified porous tin dioxide micro-nano sheet composite material, comprising the following steps:

[0054] A, dissolving stannous chloride dihydrate in a mixed solution of ethylene glycol and water with a volume ratio of 1:10 to prepare 20 milliliters of 0.2M stannous chloride solution;

[0055] Dissolve sodium hydroxide in water to prepare 10 ml of 0.5M sodium hydroxide solution;

[0056] The two solutions were heated to 45°C, and the above-mentioned sodium hydroxide solution was added to the stannous chloride solution under magnetic stirring at a rotational speed of 80 rpm, and then continued to stir at 45°C for 8 minutes to obtain a mixed suspension. , stand for 45 hours at 45°C to obtain a white precipitate; filter and wash the white precipitate, and dry at 50°C for 20 hours to obtain basic stannous chloride micro-nano sheets;

[0057] B. The basic stannous chloride micro-nano sheet is calcined at 700 ° C for 0.5 hour, and after coolin...

Embodiment 3

[0060] A preparation method of a gold-modified porous tin dioxide micro-nano sheet composite material, comprising the following steps:

[0061] A, dissolving stannous chloride dihydrate in a mixed solution of ethylene glycol and water with a volume ratio of 1:15 to prepare 20 milliliters of 0.3M stannous chloride solution;

[0062] Dissolve sodium hydroxide in water to prepare 10 ml of 1.2M sodium hydroxide solution;

[0063] The two solutions were heated to 55°C, and the above-mentioned sodium hydroxide solution was added to the stannous chloride solution under magnetic stirring at a rotational speed of 120 rpm, and then continued to stir at 55°C for 10 minutes to obtain a mixed suspension. , aged at 55 °C for 48 hours to obtain a white precipitate; the white precipitate was filtered, washed, and dried at 60 °C for 18 hours to obtain basic stannous chloride micro-nano sheets. The SEM image is as follows image 3 It can be seen from the figure that it is a micro-nano sheet wi...

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Abstract

The invention discloses a gold-modified porous tin dioxide micro-nano sheet composite material and its preparation method and application. Firstly, stannous chloride dihydrate and sodium hydroxide are used as raw materials, and are stirred, aged, filtered, washed and dried. step, obtain the nano-flaky basic tin protochloride precursor; then the nano-flaky basic tin protochloride precursor is roasted at high temperature to obtain porous flaky SnO 2 micro-nano powder; finally, with porous flake SnO 2 Micronano powder, chloroauric acid and sodium citrate were used as raw materials, and Au-modified porous SnO was obtained through steps of stirring, heating, separation, washing and drying. 2 Micro-nano sheets, Au-modified porous SnO prepared by the method of the present invention 2 The micro-nano flake powder product is a dark red powder with large specific surface area, high purity and good product quality. The gas sensing element made by it has high sensitivity, and the sensitivity S value to 100ppm ethanol gas is as high as 94.2.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a gold-modified porous tin dioxide micro-nano sheet composite material and a preparation method and application thereof. Background technique [0002] With the continuous development of science and technology, human society has entered the information age. In the field of information materials, sensors, as one of the most direct and effective tools to obtain information, have developed rapidly. Gas sensors are generally composed of sensitive elements and conversion elements, which can detect the composition and concentration of gas, and convert the relevant information into output signals, thereby realizing the detection and alarming of harmful gases. Gas sensors have very important applications in industrial production control, home life safety, food industry, medical testing, environmental protection and public safety. [0003] Tin dioxide (SnO 2 ) is an im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/02B22F1/00B22F1/145B22F9/24G01N27/12
CPCC01G19/02G01N27/127G01N27/12B22F9/24C01P2002/72C01P2002/80C01P2004/03C01P2004/04C01P2006/12B22F1/0551B22F1/07B22F1/054
Inventor 陆晓晶赵敬娟黄家锐
Owner ANHUI NORMAL UNIV
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