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Method for preparing flower-like nano SnO2 gas-sensitive material by adopting hydrothermal synthesis method

A technology of hydrothermal synthesis and gas-sensitive materials, applied in the field of nanomaterials, can solve the problems of high cost, cumbersome synthesis steps, and complicated post-processing processes, and achieve the effect of uniform size and good dispersion

Inactive Publication Date: 2021-07-20
CIVIL AVIATION UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a method of hydrothermal synthesis, using trisodium citrate as an additive, tin dichloride as a tin salt, and one-step synthesis of flower-shaped SnO with high dispersion and uniform size. 2 Nanomaterials solve the problems of high cost, cumbersome synthesis steps and complicated post-processing in the existing synthesis technology, so that they can be widely used in the field of gas sensing

Method used

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  • Method for preparing flower-like nano SnO2 gas-sensitive material by adopting hydrothermal synthesis method
  • Method for preparing flower-like nano SnO2 gas-sensitive material by adopting hydrothermal synthesis method
  • Method for preparing flower-like nano SnO2 gas-sensitive material by adopting hydrothermal synthesis method

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Embodiment 1

[0021] (1) Preparation of precursor

[0022] At room temperature, dissolve 1.0mmol tin dichloride dihydrate and 5.0mmol sodium citrate dihydrate in 20mL deionized water and stir for 10 minutes, then add 1.0mmol sodium hydroxide, stir at room temperature for 30 minutes, and then transfer to 25mL polytetrafluoroethylene Lined with vinyl fluoride, put it into a stainless steel autoclave, and keep it under 180°C hydrothermal condition for 12 hours. After cooling to room temperature, centrifugation and washing, the precursor is obtained.

[0023] (2) Flower-like nano-SnO 2 material preparation

[0024] Calcining the precursor at 500°C in air for 2 hours to obtain flower-like nano-SnO 2 Material.

Embodiment 2

[0026] (1) Preparation of precursor

[0027] At room temperature, dissolve 2.0 mmol of tin dichloride dihydrate and 5.0 mmol of sodium citrate dihydrate in 20 mL of deionized water and stir for 10 minutes, then add 1.0 mmol of sodium hydroxide, stir at room temperature for 30 minutes, and then transfer to 25 mL of Lined with vinyl fluoride, put it into a stainless steel autoclave, and keep it under 180°C hydrothermal condition for 12 hours. After cooling to room temperature, centrifugation and washing, the precursor is obtained.

[0028] (2) Flower-like nano-SnO 2 material preparation

[0029] Calcining the precursor at 500°C in air for 2 hours to obtain flower-like nano-SnO 2 Material.

Embodiment 3

[0031] (1) Preparation of precursor

[0032] At room temperature, dissolve 3.0mmol tin dichloride dihydrate and 10mmol sodium citrate dihydrate in 20mL deionized water and stir for 10 minutes, then add 2.0mmol sodium hydroxide, stir at room temperature for 30 minutes, then transfer to 25mL polytetrafluoroethylene Put it into a stainless steel autoclave with an vinyl lining, and keep it under 180°C hydrothermal conditions for 12 hours. After cooling to room temperature, centrifugation and washing, the precursor is obtained.

[0033] (2) Flower-like nano-SnO 2 material preparation

[0034] Calcining the precursor at 500°C in air for 2 hours to obtain flower-like nano-SnO 2 Material.

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Abstract

The invention discloses a method for preparing a flower-like nano SnO2 gas-sensitive material by adopting a hydrothermal synthesis method, which is characterized in that a flower-like SnO2 nano material with high dispersity and uniform size is synthesized in one step by adopting the hydrothermal synthesis method and taking trisodium citrate as an additive and tin dichloride as tin salt. The method solves the problems of high cost, tedious synthesis steps, complex post-treatment process and the like in the existing synthesis technology. The SnO2 nanomaterial with the flower-shaped structure, which is uniform in size and good in dispersity is obtained by taking the cheap trisodium citrate as an inducer through one-step synthesis, can be widely applied to the field of gas sensing, and can be widely applied to detection of dangerous chemical gases in various environments.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing flower-shaped nano SnO by hydrothermal synthesis. 2 method for gas-sensitive materials. Background technique [0002] With the rapid development of the national economy, the problem of environmental pollution is becoming more and more serious, and the discharge of toxic and polluting gases is increasing, which has gradually affected people's normal life, which makes it necessary to carry out effective detection and control of these gases. At present, the semiconductor metal oxide gas sensitive materials used for gas sensors mainly include: Fe 2 o 3 , ZnO, WO 3 、In 2 o 3 and SnO 2 etc., as a broadband n-type semiconductor (E g =3.6ev,300K), SnO 2 It has the advantages of good stability, high sensitivity, and low cost, and is the most widely used research in semiconductor metal oxide gas sensors. [0003] SnO 2 The gas-sensing performance of g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02B82Y30/00B82Y40/00G01N27/04
CPCC01G19/02B82Y30/00B82Y40/00G01N27/041C01P2004/30C01P2002/72C01P2004/61C01P2004/20C01P2004/50
Inventor 王琼亓成庞宗宇燕朝阳卢若云
Owner CIVIL AVIATION UNIV OF CHINA
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