High-performance alcohol gas sensor designed based on alcohol molecular imprinting mechanism and preparation method thereof

A gas sensor, molecular imprinting technology, applied in the direction of material resistance, can solve the problems of sensor device sensing performance, ignoring the effective film formation of nanomaterials, etc., to ensure stability and effectiveness, and ensure uniform void structure and conductivity. , the effect of high sensitivity

Inactive Publication Date: 2014-08-20
HUAZHONG NORMAL UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0002] The traditional method of designing alcohol gas sensors usually uses sol-gel synthesis, hydrothermal synthesis, template method, etc. to obtain nanomaterials, and then simply mixes them with adhesives in aqueous solution to form films, and then smears them on ceramic tubes to obtain sensors; and the traditional gas sensor design emphasizes the synthesis of nanostructured materials, while ignoring the effective film formation of nanomaterials in the device fabrication process
The effective film formation of nanomaterials will also affect the structure of nanomaterials, thereby affecting the sensing performance of sensor devices.

Method used

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  • High-performance alcohol gas sensor designed based on alcohol molecular imprinting mechanism and preparation method thereof
  • High-performance alcohol gas sensor designed based on alcohol molecular imprinting mechanism and preparation method thereof
  • High-performance alcohol gas sensor designed based on alcohol molecular imprinting mechanism and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] Material synthesis: SnO with medium pore size was obtained by hydrothermal method with and without alcohol addition 2 Nanomaterials E and W.

[0033] E: 1.5 grams of stannous chloride dihydrate (SnCl 2 2H 2 O) Dissolve in 50 ml of aqueous solution, add 20 ml of ethanol to mix, then perform magnetic stirring for 1 hour. Add 0.5 milliliters of hydrochloric acid (38% aqueous solution) in the obtained white suspension, fully stir 1 hour at room temperature, until the solution becomes clear; Keep at 120°C for 24 hours; after the hydrothermal method is fully reacted, cool naturally, and collect the yellow precipitate by centrifugation; wash the precipitate with deionized water for 3 times, and dry it in air at 60°C; The obtained primary particles were calcined in the air at a temperature of 350°C for 2 hours, and finally white medium-sized SnO particles were obtained. 2 nanomaterials.

[0034] W: 1.5 grams of stannous chloride dihydrate (SnCl 2 2H 2 O) dissolved in 70 ...

Embodiment 2

[0050] 1.5 g of stannous chloride dihydrate (SnCl 2 2H 2 O) be dissolved in the aqueous solution of 40 milliliters, add 20 milliliters of alcohols and mix, carry out magnetic stirring then, add hydrochloric acid (38% aqueous solution) in the obtained white suspension, fully stir at room temperature, until the solution becomes clear; The solution was sealed and heated to 140°C in a hydrothermal kettle, and kept for 20 hours; after the hydrothermal method was fully reacted, it was cooled naturally, and the yellow precipitate was collected by centrifugation; the precipitate was washed with water and dried; the obtained primary particles were , calcined in air at 300°C for 3 hours, and finally white medium-sized SnO 2 nanomaterials.

[0051] Take 0.15 ml of alcohol, with 0.3 g of SnO 2 The nanomaterials are mixed, prepared into a paste, and evenly coated on the ceramic tube with a thickness of 110 μm to make a sensor.

[0052] After characterization, the sensor SnO 2 Nano SnO...

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Abstract

The invention relates to an alcohol gas sensor designed based on an alcohol molecular imprinting mechanism. The high-performance alcohol gas sensor is composed of a ceramic pipe and an SnO2 film which is uniformly and densely distributed on the surface of the ceramic pipe and has a network structure, wherein the grain diameter of nano SnO2 in the SnO2 film is 9+ / -2 nanometers; BJH pore diameter distribution is intensive; the average pore diameter is 4.3+ / -0.1 nm. A preparation method comprises the following steps: dissolving stannous chloride dihydrate (SnCl12*2H2O) into a mixed solution of water and alcohol; carrying out a hydrothermal reaction and calcining to prepare a white medium-pore-diameter SnO2 nano material with a network structure; adding alcohol and mixing to prepare slurry; uniformly coating the ceramic pipe with the film; and drying to prepare the sensor. According to the alcohol gas sensor provided by the invention, the range of the concentration of alcohol gas detected is 4ppm-100ppm, the responding time is 6+ / -2 seconds and the recovering time is 22+ / -3 seconds.

Description

technical field [0001] The invention relates to the design of an alcohol gas sensor, in particular to an alcohol gas sensor with ultra-high sensitivity, fast response and recovery speed designed by adopting an alcohol molecular imprinting mechanism. Background technique [0002] The traditional method of designing alcohol gas sensors usually uses sol-gel synthesis, hydrothermal synthesis, template method, etc. to obtain nanomaterials, and then simply mixes them with adhesives in aqueous solution to form films, and then smears them on ceramic tubes to obtain sensors; and the traditional gas sensor design emphasizes the synthesis of nanostructured materials, while ignoring the effective film formation of nanomaterials in the device fabrication process. The effective film formation of nanomaterials will also affect the structure of nanomaterials, thereby affecting the sensing performance of sensor devices. Contents of the invention [0003] The object of the invention is to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 谭文虎黄新堂
Owner HUAZHONG NORMAL UNIV
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