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A kind of preparation method of cerium-doped tin dioxide sensing material for detecting formaldehyde at low temperature

A sensing material, tin dioxide technology, applied in the sensing field, can solve the problem of high operating temperature, achieve high sensitivity and improve gas sensing performance.

Active Publication Date: 2021-04-27
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are some deficiencies in the preparation of formaldehyde gas-sensing elements based on tin dioxide as gas-sensing materials, especially the operating temperature is too high

Method used

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  • A kind of preparation method of cerium-doped tin dioxide sensing material for detecting formaldehyde at low temperature
  • A kind of preparation method of cerium-doped tin dioxide sensing material for detecting formaldehyde at low temperature
  • A kind of preparation method of cerium-doped tin dioxide sensing material for detecting formaldehyde at low temperature

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Embodiment 1

[0024] Embodiment 1: Preparation of cerium-doped tin dioxide nanomaterials:

[0025] Dissolve 3.75 mmoles of tin tetrachloride pentahydrate (1.315 g) and 0.0605 mmoles of cerium nitrate hexahydrate (0.0263 g) in 15 ml of water and 15 ml of ethanol solution (the ratio of ethanol and water is 1:1) and then add 1 g of PVP (polyvinylpyrrolidone K-30), put in a magnet and stir for half an hour until the solution is dissolved, then transfer the reaction solution to a 50 ml polytetrafluoroethylene reactor, and react at 180°C for 36 h, After naturally cooling to room temperature, centrifuge at 8500 rpm for 10 minutes, alternately wash with ethanol and water three times, and dry the obtained precipitate at 80°C for 12 h, then take it out to obtain nanomaterials.

[0026] The phases of the samples were characterized by JEOL JEM-2100 transmission (TEM) and SmartLab 9 KW X-ray diffractometer (XRD).

[0027] from figure 1 From the transmission electron microscope image of the sample, it ...

Embodiment 2

[0030] Embodiment 2: the preparation of formaldehyde gas sensor:

[0031] Using the nanomaterial prepared in Example 1 as the sensing material, mix the prepared nanomaterial with a certain amount of terpineol, grind it uniformly in an agate mortar to form a slurry, and apply the slurry evenly on the surface of the ceramic tube with a brush to form Thin coating of sensing material. The heating wire is assembled on the base, the electrode is welded, and it is aged for 3 days to make a formaldehyde gas sensor.

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Abstract

The invention discloses a preparation method of a cerium-doped tin dioxide sensing material for low-temperature detection of formaldehyde, and belongs to the technical field of gas sensing. Using solvothermal method, using water and ethanol as solvents, using a certain ratio of tin source and cerium source as reactants, and at a certain reaction temperature, octahedral nanoparticles with a particle size of about 20 nm and good dispersibility were prepared. Material. The invention also provides the preparation of the cerium-doped tin dioxide gas sensor. The optimal operating temperature of the gas sensor for detecting formaldehyde gas is 100 DEG C, and has good sensitivity and response recovery characteristics. It is not sensitive to different compounds such as ethanol, acetone, ethyl acetate, methanol, and isopropanol, and has good selectivity. The preparation of the gas sensitive material has the advantages of low cost, less energy consumption and the like, and has good practical application value.

Description

technical field [0001] The invention belongs to the field of sensing technology, and in particular relates to the preparation of a cerium-doped tin dioxide nanometer material by a solvent method, and the sensing material has a gas-sensing property for detecting formaldehyde at a low temperature. Background technique [0002] SnO2 is a wide-bandgap semiconductor with a potential difference of 3-6 eV at 300 K. Due to its controllable electrical and microstructural properties, it is widely used in gas sensors, catalysts, varistors, etc. Tin dioxide is an ideal material for gas sensor applications due to its special properties. SnO nanomaterial-based sensors are widely used to detect oxidizing and reducing gases. Furthermore, it has been used to detect volatile organic compounds (VOCs), but its application is hindered due to its poor selectivity, and some modifications are needed to improve its sensing properties. For example; the Chinese patent with application number CN2013...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 宋吉明马志红袁宝珍牛和林毛昌杰陈京帅
Owner ANHUI UNIVERSITY