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A gas sensor for CO concentration detection

A gas sensor and concentration detection technology, applied in instruments, measuring devices, scientific instruments, etc., can solve problems such as hindering the combination of hemoglobin and oxygen, chimney blockage, hemoglobin losing the ability and function of carrying oxygen, etc., to achieve wide linear measurement range, The effect of short response time and low production cost

Inactive Publication Date: 2016-08-17
东兴市鸿生实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The affinity between CO and hemoglobin is 200-300 times higher than that between oxygen and hemoglobin, so CO can easily combine with hemoglobin to form carboxyhemoglobin, which hinders the combination of hemoglobin and oxygen, and makes hemoglobin lose the ability and function of carrying oxygen, thus Make the human body appear hypoxic, causing poisoning accidents; indoor doors and windows are closed, the stove has no chimney, or the chimney is blocked, air leakage, downdraft, and use of gas heaters to shower in poorly ventilated bathrooms may cause CO poisoning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A gas sensor for CO concentration detection, the preparation steps are as follows:

[0019] (1) Preparation of nitrogen-doped graphene: the reaction is carried out in a tube furnace, the tube furnace is in a vacuum state, and the vacuum degree is -0.07Mpa, and the use of a quartz tube with an outer diameter of 3.5cm and a length of 1.3m, in which Put a test tube with a diameter of 12 mm and a length of 29 mm and a test tube with a diameter of 26 mm and a length of 35 cm together, put 1 g of graphene powder and 15 g of urea into the reaction boat at the heating place, control the temperature of the tube furnace to 79 ° C, and heat The time is 10 minutes. After the reaction is completed, when the temperature is lowered to 42 ° C, an inert gas is introduced. When the pressure inside and outside the quartz tube is balanced, the sample is taken out, and the sample is washed with deionized water to remove the residual urea on the surface of the sample, and the nitrogen-doped ...

Embodiment 2

[0026] A gas sensor for CO concentration detection, the preparation steps are as follows:

[0027] (1) Preparation of nitrogen-doped graphene: the reaction is carried out in a tube furnace, and the tube furnace is in a vacuum state with a vacuum degree of -0.02Mpa, using a quartz tube with an outer diameter of 2cm and a length of 1.1m. Put a test tube with a diameter of 10mm and a length of 27mm and a test tube with a diameter of 25mm and a length of 27cm together, put 1g of graphene powder and 10g of urea into the reaction boat at the heating place, control the temperature of the tube furnace to 70°C, and the heating time After the reaction is completed, when the temperature is lowered to 40°C, an inert gas is introduced, and when the air pressure inside and outside the quartz tube is balanced, the sample is taken out, and the sample is washed with deionized water to remove the residual urea on the surface of the sample to obtain nitrogen-doped graphite. alkene.

[0028] (2)...

Embodiment 3

[0034] A gas sensor for CO concentration detection, the preparation steps are as follows:

[0035] (1) Preparation of nitrogen-doped graphene: the reaction is carried out in a tube furnace, and the tube furnace is in a vacuum state, and the vacuum degree is -0.08Mpa. Using a quartz tube with an outer diameter of 4cm and a length of 1.5m, in the middle Put a test tube with a diameter of 14mm and a length of 40mm and a test tube with a diameter of 30mm and a length of 40cm together, put 1g of graphene powder and 30g of urea into the reaction boat at the heating place, control the temperature of the tube furnace to 90°C, and the heating time After the reaction is completed, when the temperature is lowered to 45°C, an inert gas is introduced, and when the air pressure inside and outside the quartz tube is balanced, the sample is taken out, and the sample is washed with deionized water to remove the residual urea on the surface of the sample to obtain nitrogen-doped graphite. alken...

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Abstract

The present invention relates to a kind of gas sensor that is used for CO concentration detection, and the gas sensor of the present invention is based on the graphene / platinum electrode of nitrogen doping, is made of graphene, urea, Nafion solution, complex metal ([Pt(NH 3 ) 4 ] Cl 2 ), NaBH 4 and hydrazine (N 2 h 4 ) is prepared through processes such as doping, mixing, and reaction. The gas sensor involved in the present invention has a significant electrochemical catalytic effect on CO, and has a short response time and good repeatability; the gas sensor involved in the present invention can quantitatively detect the concentration of CO, and has a wide linear measurement range, and also has It has the advantages of low preparation cost, green and pollution-free, etc., and can realize real-time detection and monitoring of CO gas.

Description

technical field [0001] The invention relates to a gas sensor, in particular to a gas sensor based on a nitrogen-doped graphene-modified electrode and a preparation method thereof, which is used for detecting the concentration of CO. Background technique [0002] Carbon monoxide is a colorless, odorless, toxic gas with a specific gravity of 0.967g L -1 , the threshold limit is 25×10 -6 . The affinity between CO and hemoglobin is 200-300 times higher than that between oxygen and hemoglobin, so CO can easily combine with hemoglobin to form carboxyhemoglobin, which hinders the combination of hemoglobin and oxygen, and makes hemoglobin lose the ability and function of carrying oxygen, thus Make the human body hypoxic and cause poisoning accidents; indoor doors and windows are closed, the stove has no chimney, or the chimney is blocked, air leakage, downdraft, and using a gas heater to shower in a poorly ventilated bathroom may cause CO poisoning. In addition, when the concentr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/407
Inventor 孙京华潘正海
Owner 东兴市鸿生实业有限公司
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