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Gas sensitive material for detecting low-concentration formaldehyde

A gas-sensitive material, low-concentration technology, applied in material resistance, tin oxide, etc., can solve problems such as expensive instruments, complex

Active Publication Date: 2014-12-17
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for detecting formaldehyde in indoor air are mainly phenol reagent spectrophotometry and gas chromatography, and these methods require relatively complicated and expensive instruments.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 0.001molIn(NO 3 ) 3 ·H 2 O and 0.0045molSnCl 2 2H 2 O was dissolved in 38ml of dilute hydrochloric acid, added 0.7ml of graphene suspension with a concentration of 1.0mg / ml, ultrasonically dispersed for 1 hour, added 0.006mol urea, stirred for 10 minutes, and transferred the mixture to a volume of 50ml with polytetrafluoroethylene In a high-pressure reactor, keep it warm at 100°C for 10 hours, let the reactor cool down to room temperature naturally, filter the product, wash it with deionized water and ethanol until no chloride ions are detected in the filtrate, and dry it in vacuum at 60°C to obtain a gas-sensitive Material (SnO and In in the material 2 o 3 The molar ratio is 9, the amount of doped graphene is SnO and In 2 o 3 0.1% of the sum of the masses).

[0013] The material is made into a side-heating element, and the sensitivity of the element to 0.001ppm, 0.01ppm, 0.1ppm, 1ppm, 10ppm, 100ppm, and 1000ppm formaldehyde at a working temperature of 200°C is ...

Embodiment 2

[0015] 0.001molIn(NO 3 ) 3 ·H 2 O and 0.004molSnCl 2 2H 2 O was dissolved in 32ml of ethanol, 0.5ml of graphene ethanol suspension with a concentration of 1.0mg / ml was added, ultrasonically dispersed for 1 hour, 7ml of ethanol solution of NaOH with a concentration of 1.0mol / L was added dropwise, stirred for 10 minutes, and the mixture Transfer to a 50ml high-pressure reactor with polytetrafluoroethylene, keep it warm at 120°C for 8 hours, let the reactor cool down to room temperature naturally, filter the product, wash it with deionized water and ethanol until no chloride ions can be detected in the filtrate , dried in vacuum at 60°C to obtain the gas-sensitive material (SnO and In in the material 2 o 3 The molar ratio is 8, the amount of doped graphene is SnO and In 2 o 3 0.08% of the sum of the masses).

[0016] The material is made into a side-heating element, and the sensitivity of the element to 0.001ppm, 0.01ppm, 0.1ppm, 1ppm, 10ppm, 100ppm, and 1000ppm formaldeh...

Embodiment 3

[0018] 0.001molIn(NO 3 ) 3 ·H 2 O and 0.005molSnCl 2 2H 2 O was dissolved in 32ml of methanol alcohol, 1.2ml of graphene methanol suspension with a concentration of 1.0mg / ml was added, ultrasonically dispersed for 1 hour, and 8ml of ethanol solution of NaOH with a concentration of 1.0mol / L was added dropwise, stirred for 10 minutes, and The mixture was transferred to a 50ml high-pressure reactor with polytetrafluoroethylene, kept at 140°C for 24 hours, allowed the reactor to cool down to room temperature naturally, filtered the product, and washed it with deionized water and ethanol until no chlorine was detected in the filtrate. ions, dried in vacuum at 60°C to obtain the gas-sensitive material (SnO and In in the material 2 o 3 The molar ratio is 10, the amount of doped graphene is SnO and In 2 o 3 0.15% of the sum of the masses).

[0019] The material is made into a side-heating element, and the sensitivity of the element to 0.001ppm, 0.01ppm, 0.1ppm, 1ppm, 10ppm, 10...

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Abstract

The invention discloses a novel gas sensitive material for detecting low-concentration formaldehyde, and belongs to the technical field of gas sensitive materials. SnO is taken as a base material and In2O3 and graphene are mixed in SnO by virtue of a hydrothermal reaction method or a solvent thermal reaction method (taking alcohol and ethanol as solvents), wherein a molar ratio of SnO to In2O3 is 8-10, and the amount of doped graphene accounts for 0.08-0.15% the sum of the mass of the SnO and the In2O3. A heater-type gas sensitive sensor which is made by taking the material as the gas sensitive material has sensitivity (a ratio of resistance of elements in air to resistance of elements in detected gas) of 1.09-1.1 to 0.001ppm formaldehyde and has sensitivity of 220-240 on 1000ppm formaldehyde at a working temperature of 200 DEG C.

Description

technical field [0001] The invention belongs to a gas sensitive material, which is used for making a gas sensor, and the made gas sensor has high sensitivity and good selectivity to low-concentration formaldehyde in the air. technical background [0002] Formaldehyde is a gas with a strong pungent smell, easily soluble in water, and its 40% aqueous solution is called formalin. The impact of formaldehyde on human health is mainly manifested in olfactory stimulation, allergy, abnormal lung function, abnormal liver function and immune abnormal function etc. Long-term exposure to low-dose formaldehyde can cause chronic respiratory diseases, nasopharyngeal cancer, colon cancer, brain tumors and other diseases. Formaldehyde is one of the main pollutants in indoor air. my country's indoor air quality standard (GB / T 18883-2002) stipulates that the average value of indoor formaldehyde in one hour should be 0.10mg / m 3 (0.081ppm) or less. [0003] At present, the methods for detecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04C01G19/02
Inventor 储向峰白林山胡如雪祝欢余晓云
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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