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NO2 sensor and preparation method thereof

A sensing method and sensor technology, applied in the sensing field, can solve the problems of limited practical application, energy waste, low detection limit, etc., and achieve the effects of simple operation, good selectivity and high selectivity

Pending Publication Date: 2022-06-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although semiconducting metal oxides have a better sensing effect on common toxic and harmful gases, and can obtain higher sensitivity and lower detection limits, most semiconducting metal oxides require high temperatures above 250°C It can work only when it is lower, which greatly limits its practical application while causing energy waste

Method used

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  • NO2 sensor and preparation method thereof
  • NO2 sensor and preparation method thereof
  • NO2 sensor and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0024] (1) Preparation of the sensor: the Ni / Co double metal oxide was prepared into a suspension with absolute ethanol, and dispersed uniformly by ultrasonic. Use a pipette gun to pipette an appropriate amount and evenly coat the surface of the ceramic tube to form a thin film. After thorough drying, fix the coated ceramic tube in a self-made sealed bottle with a wire, and check the tightness of the entire gas circuit.

[0025] (2)NO 2 Sensing: Use an external DC power supply to heat the sensor to a specific temperature. Open a certain flow of air through the flow control system, and make the resistance of the sensor reach a stable value in dry air. Under the premise of keeping the total flow constant, adjust the NO 2 with air flow to achieve a change in NO 2 concentration effect. Start the timer to make different concentrations of NO 2 After reacting with the sensor for a certain period of time, turn off the NO 2 Air circuit, adjust the flow rate of the air circuit to...

Embodiment 1

[0034] The preparation of embodiment 1 sensor

[0035] The Ni / Co double metal oxide was formulated into a 1 mg / ml suspension with absolute ethanol, and dispersed evenly by ultrasonication for 30 minutes. Pipette an appropriate amount of 20 μL and evenly coat the surface of the ceramic tube to form a 0.2 mm thin film. After being thoroughly dried at room temperature for 12 hours, the coated ceramic tube was fixed in a self-made sealed bottle with wires, such as figure 1 As shown, one end of the two wires is connected to the metal post of the sensor base, and the other end is connected to the multimeter. One end of the other two wires is also connected to the metal post of the sensor base, and the other end is connected to the DC power supply. Air tightness.

Embodiment 2

[0036] The preparation of embodiment 2 sensor

[0037]The Ni / Co double metal oxide was formulated into a 1 mg / ml suspension with absolute ethanol, and dispersed evenly by ultrasonication for 30 minutes. Pipette an appropriate amount of 50 μL and evenly coat the surface of the ceramic tube to form a 0.5 mm thin film. After being thoroughly dried at room temperature for 12 hours, the coated ceramic tube was fixed in a self-made sealed bottle with wires, such as figure 1 As shown, one end of the two wires is connected to the metal post of the sensor base, and the other end is connected to the multimeter. One end of the other two wires is also connected to the metal post of the sensor base, and the other end is connected to the DC power supply. Air tightness.

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Abstract

According to the NO2 sensor and the preparation method thereof provided by the invention, the Ni / Co bimetallic oxide synthesized by taking MOF as a template is used for detecting NO2, and compared with a conventional semiconductor metal oxide, the Ni / Co bimetallic oxide in the method shows relatively sensitive response to NO2, the response time is relatively short, and the response temperature is relatively low; in addition, no obvious response is caused to common volatile organic compounds, and good selectivity is embodied. The method is expected to be widely applied to low-temperature NO2 sensing of semiconductor metal oxides.

Description

technical field [0001] The invention belongs to the field of sensing methods, and in particular relates to a method for preparing Ni / Co double metal oxides to NO by using MOF as a template. 2 Sensing method. Background technique [0002] In recent years, the synthesis and performance research of nanomaterials have made great progress. Among them, semiconductor metal oxides, as a large class of important functional materials, have been widely used in the field of gas sensing. Although semiconducting metal oxides have a better sensing effect on common toxic and harmful gases, and can obtain higher sensitivity and lower detection limits, most semiconducting metal oxides require high temperatures above 250°C. It can work only when it is lower, which greatly limits its practical application while causing energy waste. Therefore, reducing the operating temperature of semiconductor metal oxides and retaining their good sensing properties has become a very important issue. [000...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/126
Inventor 冯亮高建梅
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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