Sensor and method for detecting concentration of active metal oxide in air

Abstract

The invention discloses a sensor and method for detecting the concentration of active metal oxides in air, the sensor comprises a first reaction chamber, a first detection chamber, a second reaction chamber and a second detection chamber which are communicated in sequence, the first reaction chamber is provided with an air inlet, the first reaction chamber is internally provided with a carbon monoxide thermocatalytic oxidant, and the second reaction chamber is provided with an air outlet. A first carbon dioxide sensitive film is arranged in the first detection chamber, a water absorption layer is arranged in the second reaction chamber, and a second carbon dioxide sensitive film is arranged in the second detection chamber. Active metal oxide particles easily react with carbon dioxide in a water vapor environment, and the concentration of the active metal oxide particles is indirectly reflected by detecting the concentration difference of the carbon dioxide before and after the reaction.

Description

technical field

[0001] The invention belongs to the technical field of particle component detection in the air, and specifically relates to a device for detecting the concentration of active metal oxide particles in the air, in particular to a device for detecting the concentration of active metal oxide particles in the hazardous chemical warehouse by detecting carbon dioxide in the air The concentration difference indirectly detects the concentration of active metal oxide particles in the air. Background technique

[0002] Fire and explosion in hazardous chemical warehouses is a relatively high-occurrence type of accident in my country, usually caused by management negligence and illegal operations. Hazardous chemicals are generally accompanied by characteristics such as flammable, explosive, toxic and harmful. When a fire occurs, it is difficult to extinguish the fire. There are many kinds of hazardous chemicals, which have different requirements for fire extinguishing ag...

Examples

Embodiment 1

[0035] A method for preparing a sensor for detecting the concentration of active metal oxides in the air in a fire environment, comprising the following steps:

[0036] SA1. Use HF solution to wet-etch the silicon-based sensitive film substrate 3, and etch a mounting groove for the replaceable water-absorbing material 9 on the upper end of the silicon-based sensitive film substrate 3.

[0037] SA2, the carbon monoxide thermal catalytic oxidizer 5, the first carbon dioxide sensitive film 8 and the second carbon dioxide sensitive film 10 are fixed on the silicon-based sensitive film through the first adhesive layer 4, the second adhesive layer 7 and the third adhesive layer 10 on substrate 3. The material of the first adhesive layer 4, the second adhesive layer 7 and the third adhesive layer 10 is novolac epoxy resin containing carborane, which can maintain good mechanical properties and adhesive properties at a temperature of 400 ° C. , chemical stability and electrical insula...

Embodiment 2

[0049] The material of the first carbon dioxide gas sensitive film 8 and the second carbon dioxide sensitive film 11 is CuO-BaTiO doped with 0.8%-1.2% Ag 3 , to measure the concentration of carbon dioxide before and after the reaction, and the measurement range can reach 0.01%-10%. The preparation process includes: preparation of CuO-BaTiO3 composite powder, Ag doping and sintering of gas-sensitive thin film. This manufacturing method can conveniently adjust the Ag, CuO and BaTiO in the final carbon dioxide sensitive thin film. 3 The content of preparation method is simple and easy, specifically comprises the following steps:

[0050] SB1, the BaTiO 3 with Cu(CO 2 CH 3 ) 2 ·H 2 O powder was added to deionized water at a mass ratio of (1.1-1.2):1 to obtain solution A. Add an appropriate amount of ethylene glycol to solution A as a shape-directing agent, ethylene glycol and BaTiO 3 The mass ratio of NaOH is (0.7-0.8): 1 and then NaOH solution is added dropwise, and the ma...

Embodiment 3

[0054] Carbon monoxide thermocatalytic oxidizer 5 uses Co containing 0.04%wt-0.05wt% Au 3 o 4 . Its preparation process is:

[0055] SC1, Co(NO 3 ) 2 and Na 2 CO 3 Co was produced using the co-precipitation method at room temperature 3 o 4 crystal, and then calcined at 400°C for 5h to obtain Co 3 o 4 piece.

[0056] SC2, the Co 3 o 4 Block cut into 10mm x 10mm x 0.5mm Co 3 o 4 Flakes.

[0057] SC3, using a target containing 0.05wt% gold for sputtering, and adsorbing gold atoms on Co 3 o 4 The surface of the flake was calcined at 400° C. for 5 h after sputtering to obtain a carbon monoxide thermal catalytic oxidizer 5 .

[0058] The carbon monoxide thermal catalytic oxidizer 5 is used to catalyze the oxidation of carbon monoxide in the air to carbon dioxide in advance, so as to prevent the Ag in the gas-sensitive film from catalytically oxidizing carbon monoxide to carbon dioxide from affecting the test results. co 3 o 4 It is a highly efficient thermal cata...

technical field

[0001] The invention belongs to the technical field of particle component detection in the air, and specifically relates to a device for detecting the concentration of active metal oxide particles in the air, in particular to a device for detecting the concentration of active metal oxide particles in the hazardous chemical warehouse by detecting carbon dioxide in the air The concentration difference indirectly detects the concentration of active metal oxide particles in the air. Background technique

[0002] Fire and explosion in hazardous chemical warehouses is a relatively high-occurrence type of accident in my country, usually caused by management negligence and illegal operations. Hazardous chemicals are generally accompanied by characteristics such as flammable, explosive, toxic and harmful. When a fire occurs, it is difficult to extinguish the fire. There are many kinds of hazardous chemicals, which have different requirements for fire extinguishing ag...

Examples

Embodiment 1

[0035] A method for preparing a sensor for detecting the concentration of active metal oxides in the air in a fire environment, comprising the following steps:

[0036] SA1. Use HF solution to wet-etch the silicon-based sensitive film substrate 3, and etch a mounting groove for the replaceable water-absorbing material 9 on the upper end of the silicon-based sensitive film substrate 3.

[0037] SA2, the carbon monoxide thermal catalytic oxidizer 5, the first carbon dioxide sensitive film 8 and the second carbon dioxide sensitive film 10 are fixed on the silicon-based sensitive film through the first adhesive layer 4, the second adhesive layer 7 and the third adhesive layer 10 on substrate 3. The material of the first adhesive layer 4, the second adhesive layer 7 and the third adhesive layer 10 is novolac epoxy resin containing carborane, which can maintain good mechanical properties and adhesive properties at a temperature of 400 ° C. , chemical stability and electrical insula...

Embodiment 2

[0049] The material of the first carbon dioxide gas sensitive film 8 and the second carbon dioxide sensitive film 11 is CuO-BaTiO doped with 0.8%-1.2% Ag 3 , to measure the concentration of carbon dioxide before and after the reaction, and the measurement range can reach 0.01%-10%. The preparation process includes: preparation of CuO-BaTiO3 composite powder, Ag doping and sintering of gas-sensitive thin film. This manufacturing method can conveniently adjust the Ag, CuO and BaTiO in the final carbon dioxide sensitive thin film. 3 The content of preparation method is simple and easy, specifically comprises the following steps:

[0050] SB1, the BaTiO 3 with Cu(CO 2 CH 3 ) 2 ·H 2 O powder was added to deionized water at a mass ratio of (1.1-1.2):1 to obtain solution A. Add an appropriate amount of ethylene glycol to solution A as a shape-directing agent, ethylene glycol and BaTiO 3 The mass ratio of NaOH is (0.7-0.8): 1 and then NaOH solution is added dropwise, and the ma...

Embodiment 3

[0054] Carbon monoxide thermocatalytic oxidizer 5 uses Co containing 0.04%wt-0.05wt% Au 3 o 4 . Its preparation process is:

[0055] SC1, Co(NO 3 ) 2 and Na 2 CO 3 Co was produced using the co-precipitation method at room temperature 3 o 4 crystal, and then calcined at 400°C for 5h to obtain Co 3 o 4 piece.

[0056] SC2, the Co 3 o 4 Block cut into 10mm x 10mm x 0.5mm Co 3 o 4 Flakes.

[0057] SC3, using a target containing 0.05wt% gold for sputtering, and adsorbing gold atoms on Co 3 o 4 The surface of the flake was calcined at 400° C. for 5 h after sputtering to obtain a carbon monoxide thermal catalytic oxidizer 5 .

[0058] The carbon monoxide thermal catalytic oxidizer 5 is used to catalyze the oxidation of carbon monoxide in the air to carbon dioxide in advance, so as to prevent the Ag in the gas-sensitive film from catalytically oxidizing carbon monoxide to carbon dioxide from affecting the test results. co 3 o 4 It is a highly efficient thermal cata...

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