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Sensitive material for detecting formaldehyde gas, preparation method and application thereof

A formaldehyde gas and sensitive material technology, applied in the field of sensors, can solve the problems of low detection limit, low working temperature and high sensitivity, and achieve the effects of simple steps, low working temperature and good response

Active Publication Date: 2018-11-16
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention relates to a Cd-doped SnO with a one-dimensional fiber structure prepared by a simple hydrothermal method using a biological material as a template 2 Nano-sensitive material, used to detect formaldehyde gas, has the advantages of high sensitivity, low working temperature, good selectivity, low detection limit and good stability, and has not yet seen relevant literature reports and patent applications

Method used

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  • Sensitive material for detecting formaldehyde gas, preparation method and application thereof
  • Sensitive material for detecting formaldehyde gas, preparation method and application thereof
  • Sensitive material for detecting formaldehyde gas, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Biological template pretreatment: peel off the white part of the inner layer of pomelo peel and cut it into many small pieces, wash with deionized and absolute ethanol, soak several times, ultrasonicate for 1h and dry at 60°C for 12h to obtain Dried pomelo peel bio template;

[0032] (2) Precursor solution preparation: under stirring at room temperature, 10mmol SnCl 4 ·5H 2 O was dissolved in a mixed solvent of 20mL deionized water and 20mL absolute ethanol;

[0033] (3) Add the 1g dry pomelo peel template obtained in step (1) into the mixed solution obtained in step (2) under stirring, and add 0.2404g urea (CO(NH 2 ) 2 ), the mixed solution was continuously stirred for 4h and ultrasonically treated for 30min;

[0034] (4) Transfer the mixed solution obtained in step (3) to a polytetrafluoroethylene lining, and keep it warm in a constant temperature drying oven at 150° C. for 12 hours;

[0035](5) Take it out and cool it down to room temperature. The obtained p...

Embodiment 2

[0039] (1) Biological template pretreatment: peel off the white part of the inner layer of pomelo peel and cut it into many small pieces, wash with deionized and absolute ethanol, soak several times, ultrasonicate for 1h and dry at 60°C for 12h to obtain Dried pomelo peel bio template;

[0040] (2) Precursor solution preparation: under stirring at room temperature, 10mmol SnCl 4 ·5H 2 O was dissolved in a mixed solvent of 20mL deionized water and 20mL absolute ethanol; then adding a molar ratio of 5mol% in the above solution;

[0041] (3) Add the 1g dry pomelo peel template obtained in step (1) into the mixed solution obtained in step (2) under stirring, and add 0.2404g urea (CO(NH 2 ) 2 ), the mixed solution was continuously stirred for 4h and ultrasonically treated for 30min;

[0042] (4) Transfer the mixed solution obtained in step (3) to a polytetrafluoroethylene lining, and keep it warm in a constant temperature drying oven at 150° C. for 12 hours;

[0043] (5) Tak...

Embodiment 3

[0047] (1) Biological template pretreatment: peel off the white part of the inner layer of pomelo peel and cut it into many small pieces, wash with deionized and absolute ethanol, soak several times, ultrasonicate for 1h and dry at 60°C for 12h to obtain Dried pomelo peel bio template;

[0048] (2) Precursor solution preparation: under stirring at room temperature, 10mmol SnCl 4 ·5H 2 O is dissolved in the mixed solvent of 20mL deionized water and 20mL absolute ethanol; Adding molar ratio is 10mol% in the above solution;

[0049] (3) Add the 1g dry pomelo peel template obtained in step (1) into the mixed solution obtained in step (2) under stirring, and add 0.2404g urea (CO(NH 2 ) 2 ), the mixed solution was continuously stirred for 4h and ultrasonically treated for 30min;

[0050] (4) Transfer the mixed solution obtained in step (3) to a polytetrafluoroethylene lining, and keep it warm in a constant temperature drying oven at 150° C. for 12 hours;

[0051] (5) Take it ...

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Abstract

The invention discloses a sensitive material for detecting formaldehyde gas, a preparation method and application thereof. Shaddock peel is used as a biological template to synthesize a formaldehyde gas sensitive material of cadmium doped one-dimensional SnO2 nanofiber. The preparation steps are as follows: (1) peeling off the inner layer of the shaddock peel and cutting into blocks, then immersing in deionized water and anhydrous ethanol, carrying out ultrasonic treatment and drying; (2) dissolving SnCl4.5H2O in a mixed liquor of deionized water and anhydrous ethanol, and then adding CdCl2.2(0 / 1)H2O into the mixed liquor; (3) adding the biological template shaddock peel and urea into the mixed liquor and carrying out ultrasonic treatment; (4) transferring the above solution to a PTFE lining, carrying out thermal insulation in a constant temperature drying oven, and then taking out and cooling to room temperature; washing the obtained product by alternating centrifugal washing with deionized water and anhydrous ethanol, drying, annealing, and collecting to obtain the sensitive material. When being used to prepare gas sensors for detecting formaldehyde gas, the above material has advantages of high sensitivity, fast response, good selectivity, low operating temperature, good stability and the like.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a sensitive material for detecting formaldehyde gas, a preparation method and application thereof. Background technique [0002] Formaldehyde is an important raw material that is widely used in various industrial processes, including chemicals, furniture, textiles, buildings, printing and industrial cleaning, etc., and can produce many products related to people's lives. At the same time, formaldehyde is also a colorless gas with a pungent odor, which can be continuously discharged from various sources, such as building materials, furniture, dry cleaning agents, cosmetics and medicines. Formaldehyde is recognized as one of the most important air pollutants in living and working places such as residences, offices and living environments. Formaldehyde is also one of the raw materials that cause sick building syndrome. Exposure to high concentrations of formaldehyde gas can cause m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00C01G19/02B82Y40/00
CPCB82Y40/00C01G19/02C01P2002/72C01P2004/03C01P2004/10G01N27/00
Inventor 王毓德赵荣俊董成军王莉红肖雪春
Owner YUNNAN UNIV
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