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Preparation method of silver-doped tin dioxide nanosheet self-assembled flower-like material

A technology of tin dioxide and nanosheets, applied in the field of gas-sensing sensing materials, can solve the problems of low sensitivity of gas-sensing materials, and achieve the effects of enhanced gas-sensing performance, simple operation, good sensitivity and selectivity

Pending Publication Date: 2020-11-10
XI'AN POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of silver-doped tin dioxide nanosheet self-assembled flower-like material, which solves the problem of low sensitivity of gas-sensitive materials existing in the prior art

Method used

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  • Preparation method of silver-doped tin dioxide nanosheet self-assembled flower-like material
  • Preparation method of silver-doped tin dioxide nanosheet self-assembled flower-like material
  • Preparation method of silver-doped tin dioxide nanosheet self-assembled flower-like material

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preparation example Construction

[0022] A method for preparing a silver-doped tin dioxide nanosheet self-assembled flower-like material, specifically comprising the following steps:

[0023] Step 1. Add stannous chloride and trisodium citrate into the mixed solution of deionized water and ethylene glycol, stir to obtain mixed solution A, then add silver nitrate to the mixed solution, and stir for 1h-1.5h to get mixed solution B ; The molar ratio of stannous chloride, trisodium citrate, and silver nitrate is 1:1:0.0208~1:1:0.0832, and the mixing ratio of deionized water and ethylene glycol is 2:3;

[0024] SnO 2 It can be obtained by hydrolysis of tin salt, and the specific reaction is as follows:

[0025] S n 2+ +2H 2 O→S n (OH) 2 +2H +

[0026]

[0027]

[0028] S n (OH) 4 +2OH - →S n (OH) 6 2-

[0029] S n (OH) 6 2- →S n o 2 +2OH - +2H 2 o

[0030] Among them, sodium citrate in SnO 2 play a crucial role in the formation of the structure. Sodium citrate promotes SnO during the ...

Embodiment 1

[0035] Step 1. Add 0.188g of stannous chloride and 2.45g of trisodium citrate into the mixed solution of deionized water and ethylene glycol, stir to obtain mixed solution A, then add 0.0035g of silver nitrate to the mixed solution, and stir for 1h to obtain Mixture B; the mixing ratio of deionized water and ethylene glycol is 2:3;

[0036] Step 2. Put the mixed solution B in a polytetrafluoroethylene reactor for hydrothermal reaction. The temperature of the hydrothermal reaction is 200°C, and the reaction time is 24h. After cooling to room temperature, take out the mixture at the bottom of the reactor, and place the mixture in Centrifuge in the centrifuge tube to obtain the sample;

[0037] Step 3. Wash the sample with deionized water and ethanol in sequence, and obtain the self-assembled flower-like material of silver-doped tin dioxide nanosheets after drying. The SEM image is as follows figure 1 , figure 2 Shown, the SnO of Example 1 2 Nanomaterials are composed of disc...

Embodiment 2

[0040] Step 1. Add 0.19g stannous chloride and 2.46g trisodium citrate into the mixed solution of deionized water and ethylene glycol, stir to obtain mixed solution A, then add 0.014g silver nitrate to the mixed solution, and stir for 1.2h Obtain mixed solution B; the mixing ratio of deionized water and ethylene glycol is 2:3;

[0041] Step 2. Put the mixed solution B in a polytetrafluoroethylene reactor for hydrothermal reaction. The temperature of the hydrothermal reaction is 190°C, and the reaction time is 20h. After cooling to room temperature, take out the mixture at the bottom of the reactor, and place the mixture in Centrifuge in the centrifuge tube to obtain the sample;

[0042] Step 3: The sample is washed sequentially with deionized water and ethanol, and dried to obtain a self-assembled flower-like material of silver-doped tin dioxide nanosheets.

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Abstract

The invention discloses a preparation method of a silver-doped tin dioxide nanosheet self-assembled flower-like material, which comprises the following steps: adding stannous chloride and trisodium citrate into a mixed solution of deionized water and ethylene glycol, stirring the mixture to obtain a mixed solution A, adding silver nitrate into the mixed solution, and stirring the mixture to obtaina mixed solution B; putting the mixed solution B into a polytetrafluoroethylene reaction kettle to carry out hydrothermal reaction, cooling a reaction product, taking out a mixture at the bottom of the reaction kettle, and carrying out centrifugal separation on the mixture to obtain a sample; and sequentially washing the sample with deionized water and ethanol, and drying the sample to obtain thesilver-doped tin dioxide nanosheet self-assembled flower-like material. Silver is introduced into stannic oxide, the conductivity of stannic oxide is changed, and the gas sensitivity of stannic oxideis enhanced, so that the detection of target gas molecules is realized.

Description

technical field [0001] The invention belongs to the technical field of gas-sensing sensing materials, and relates to a method for preparing a silver-doped tin dioxide nanosheet self-assembled flower-like material. Background technique [0002] With the advancement of science and technology, the gas emitted by industry, agriculture and people's daily life is gradually increasing. Among these gases, some are flammable and explosive, such as hydrogen, alcohol, and other gases; some are toxic, such as hydrogen sulfide, carbon monoxide, and other gases; some are used to accelerate the decay of fruits and vegetables in agricultural production, such as ethylene, etc. gas. The detection of these gases is a major problem that people have to solve. The gas sensor can detect the composition and concentration of the gas, and convert the relevant information into an available output signal, so as to perform the functions of gas detection and alarm. This has great significance for produ...

Claims

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Application Information

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IPC IPC(8): C01G19/02G01N27/12
CPCC01G19/02G01N27/125C01P2002/72C01P2004/03C01P2002/52C01P2004/30
Inventor 刘斌陈宁张鹏杜燕萍常薇
Owner XI'AN POLYTECHNIC UNIVERSITY
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