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CO sensing material with sno2 doped catalyst and its preparation method and application

A technology for sensing materials and catalysts, applied in the direction of material resistance, etc., can solve the problems of inability to really obtain applications, slow response speed and recovery speed, etc., and achieve a simple and controllable method and process, fast response speed and recovery speed, and good response. Effect

Inactive Publication Date: 2018-08-21
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After introducing platinum as a catalyst in this way, the bulk material has a significant response to carbon monoxide at room temperature (Sens.Actuators B 184,33–39(2013)), but its response speed and recovery speed are very slow ( 144 seconds and 882 seconds respectively), so that the material cannot really be applied

Method used

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  • CO sensing material with sno2 doped catalyst and its preparation method and application
  • CO sensing material with sno2 doped catalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Taking commercially available tin dioxide nanometer powder as raw material, add Pt powder (platinum powder) equivalent to 5wt% of tin dioxide nanometer powder mass, add deionized water to form a suspension, magnetically stir for 4 hours, make it mix uniformly, The mixed powder mixed with Pt powder was separated by centrifugation, dried at 110 degrees Celsius, and then deionized water was used as a binder to grind and granulate in an agate mortar. Through the mold, the disc is pressed into a disc with a diameter of 12 mm and a thickness of 1 mm with a pressure of 10 MPa. The wafer was heat-treated at 900 degrees Celsius for 2 hours in a box furnace, and the wafer was naturally cooled to room temperature with the furnace and then taken out. A pair of Pt electrodes with a width of 2 mm, a length of 5 mm and a distance of 3 mm were formed on one surface of the wafer by magnetron sputtering. Weld a pair of lead wires to the pair of electrodes, and connect with a resistance ...

Embodiment 2

[0029] Using commercially available tin dioxide nanopowder as raw material, add deionized water to form a suspension, then add Pd powder (palladium powder) equivalent to 5wt% of the mass of tin dioxide nanopowder, and stir magnetically for 4 hours to make it evenly mixed , the mixed powder mixed with Pd powder was separated by centrifugation, dried at 110 degrees Celsius, and then deionized water was used as a binder to grind and granulate in an agate mortar. Through the mold, the disc is pressed into a disc with a diameter of 12 mm and a thickness of 1 mm with a pressure of 10 MPa. The wafer was heat-treated at 900 degrees Celsius for 2 hours in a box furnace, and the wafer was naturally cooled to room temperature with the furnace and then taken out. From figure 1 It can be seen that in the ceramics obtained under this condition, the grain size of tin dioxide is mostly about 100 nanometers, and there are many voids. This is very beneficial for carbon monoxide to diffuse int...

Embodiment 3

[0031]Using commercially available tin dioxide nanopowder as raw material, add Pt powder equivalent to 5wt% of the mass of tin dioxide nanopowder, mix in an agate mortar for 4 hours, then use alcohol as a binder, and mix in an agate mortar Grinding and granulating. Through a mold, press at a pressure of 10 MPa to form a disc with a diameter of 12 mm and a thickness of 1 mm. The wafer was heat-treated at 900° C. for 0.5 hour in a box furnace, and the wafer was naturally cooled to room temperature with the furnace and then taken out. A pair of Pt electrodes with a width of 2 mm, a length of 5 mm and a distance of 3 mm were formed on one surface of the wafer by magnetron sputtering. Weld a pair of lead wires to the pair of electrodes and connect them to the resistance meter. Weld a pair of lead wires to the pair of electrodes and connect them to the resistance meter to measure the resistance between the two electrodes. and the higher the carbon monoxide concentration, the great...

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Abstract

The invention discloses a CO sensing material of a SnO2 doped platinum / palladium catalyst, a preparation method of the CO sensing material and application of the CO sensing material for preparing a carbon monoxide sensor. A nano-bulk, with certain porosity, obtained by doping of platinum / palladium and control on sintering temperature is doped with platinum and palladium having catalysis in carbon monoxide molecules in appropriate form, carbon monoxide is catalyzed into the high-activity state at room temperature, and accordingly resistance is lowered by reaction with stannic oxide, and the CO sensing material can work at room temperature; metal electrodes are prepared on the surface of the nano-bulk by means of sputtering, the carbon monoxide sensor having good response to carbon monoxide at room temperature can be obtained, the carbon monoxide sensor has good response to carbon monoxide and is fast in response and recovery, and operating temperature can be effectively lowered to room temperature.

Description

technical field [0001] The invention belongs to the technical field of carbon monoxide sensor preparation, in particular to a SnO sensor 2 CO sensing material doped with platinum / palladium catalyst, its preparation method and its application in the preparation of carbon monoxide sensor. Background technique [0002] In many fields such as chemical industry, energy production, automobile exhaust and family life, it is necessary to monitor the concentration of carbon monoxide in the environment in real time. At present, carbon monoxide sensors can be generally divided into several categories: heat conduction type, catalytic combustion type, electrochemical type and semiconductor type. Among them, thermal conduction and catalytic combustion sensors have low sensitivity and poor selectivity to carbon monoxide; electrochemical carbon monoxide sensors have high sensitivity and fast response speed at room temperature, and are currently the most widely used. However, the electroly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04
CPCG01N27/04
Inventor 陈万平孙蓓蕾熊遥王雪凝
Owner WUHAN UNIV