Pd-SnO2 oxide semiconductor sensor for carbon monoxide as well as preparation and application

An oxide semiconductor, carbon monoxide technology, applied in the direction of material resistance, can solve the problems of high detection lower limit and low sensitivity of sensors, and achieve the effect of low detection lower limit, high sensitivity, good selectivity and repeatability

Inactive Publication Date: 2015-09-02
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the main factors limiting the practicality of this type of sensor is the high detection limit and low sensitivity of the sensor.

Method used

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  • Pd-SnO2 oxide semiconductor sensor for carbon monoxide as well as preparation and application
  • Pd-SnO2 oxide semiconductor sensor for carbon monoxide as well as preparation and application
  • Pd-SnO2 oxide semiconductor sensor for carbon monoxide as well as preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Pd-SnO with a mass ratio of element Pd / Sn in the reactant of 0.015:1 2 Oxide semiconductors are used as sensitive materials to make carbon monoxide sensors. The manufacturing process is

[0040] (1) First, 0.0125g PdCl 2 and a certain amount of ethylenediamine to configure 2ml of aqueous solution.

[0041] (2) 0.9g SnCl 2 .2H 2 O, 2.94g Na 3 C 6 h 5 o 7 .2H 2 Dissolve in 10ml of water while stirring, add 2ml of the aqueous solution in (1) and continue to stir to form a homogeneous solution, then add 10ml of 0.2M NaOH aqueous solution dropwise and then stir for 5 minutes;

[0042] (3) Put the mixed solution of (2) into a 100ml polytetrafluoroethylene kettle and seal it, put it into a microwave hydrothermal system, and set the microwave parameters as follows: the maximum power is 300W, first heat it to 180°C for 10 minutes, and keep the temperature at 180°C for one hour. After the end, the temperature was naturally lowered to room temperature, and the sample was ...

Embodiment 2

[0046] Pd-SnO with a mass ratio of element Pd / Sn in the reactant of 0.030:1 2 Oxide semiconductors are used as sensitive materials to make carbon monoxide sensors. The manufacturing process is

[0047] (1) First, 0.025g PdCl 2 and a certain amount of ethylenediamine to configure 2ml of aqueous solution.

[0048] (2) 0.9g SnCl 2 .2H 2 O, 2.94g Na 3 C 6 h 5 o 7 .2H 2 Dissolve in 10ml of water while stirring, add 2ml of the aqueous solution in (1) and continue to stir to form a homogeneous solution, then add 10ml of 0.2M NaOH aqueous solution dropwise and then stir for 5 minutes;

[0049] (3) Put the mixed solution of (2) into a 100ml polytetrafluoroethylene kettle and seal it, put it into a microwave hydrothermal system, and set the microwave parameters as follows: the maximum power is 300W, first heat it to 180°C for 10 minutes, and keep the temperature at 180°C for one hour. After the end, the temperature was naturally lowered to room temperature, and the sample was c...

Embodiment 3

[0053] Pd-SnO with a mass ratio of element Pd / Sn in the reactant of 0.045:1 2 Oxide semiconductors are used as sensitive materials to make carbon monoxide sensors. The manufacturing process is

[0054] (1) First, 0.0375g PdCl 2 and a certain amount of ethylenediamine to configure 2ml of aqueous solution.

[0055] (2) 0.9g SnCl 2 .2H 2 O, 2.94g Na 3 C 6 h 5 o 7 .2H 2 Dissolve in 10ml of water while stirring, add 2ml of the aqueous solution in (1) and continue to stir to form a homogeneous solution, then add 10ml of 0.2M NaOH aqueous solution dropwise and then stir for 5 minutes;

[0056] (3) Put the mixed solution of (2) into a 100ml polytetrafluoroethylene kettle and seal it, put it into a microwave hydrothermal system, and set the microwave parameters as follows: the maximum power is 300W, first heat it to 180°C for 10 minutes, and keep the temperature at 180°C for one hour. After the end, the temperature was naturally lowered to room temperature, and the sample was ...

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Abstract

The invention provides a Pd-SnO2 oxide semiconductor sensor for carbon monoxide prepared by utilizing a microwave assisted hydrothermal method and a preparation method thereof as well as application of the Pd-SnO2 oxide semiconductor sensor to detection of mine gas and carbon monoxide in the atmospheric environment, and belongs to the technical field of gas sensors. The sensor is composed of a commercially available Al2O3 insulating ceramic tube with two annular gold electrodes on the outer surface, Pd-SnO2 oxide semiconductor sensitive materials coating the outer surfaces of the annular gold electrodes and the Al2O3 insulating ceramic tube, and a nickel-cadmium alloy heating coil penetrating through the inner part of the Al2O3 insulating ceramic tube. The sensor has relatively good linearity degree on the carbon monoxide with relatively low concentration (100ppm), so that the Pd-SnO2 oxide semiconductor carbon monoxide sensor can be used for detecting the atmospheric environment and the mine gas very well, and furthermore, the mine safety and the environment safety can be judged by detecting the concentration of the carbon monoxide.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a Pd-SnO prepared by a microwave-assisted hydrothermal method 2 An oxide semiconductor carbon monoxide sensor, a preparation method and its application in detecting the concentration of carbon monoxide in mines and atmospheric environments. Background technique [0002] Carbon monoxide (CO) is a colorless, tasteless and odorless gas that is the third most carbon-containing component in the atmosphere, second only to CO 2 and CH 4 , is an important gas in the study of the global carbon cycle. In the case of uneven distribution of emission sources, the concentration of global atmospheric CO has obvious temporal and spatial distribution differences, and it is often used as an important tracer in the study of greenhouse gas sources and sinks. In 1949, CO in the atmosphere was discovered through the study of solar spectrum, and the first measurement of CO concentration in the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 王庆吉魏庆丽韩思雨
Owner JILIN UNIV
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