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Graphene/tin dioxide quantum dot composite material-based NO2 sensor and preparation method thereof

A technology of tin dioxide and composite materials, which is applied in the analysis of materials, material resistance, material analysis by electromagnetic means, etc. It can solve the problems of short response recovery time and low detection limit, and achieve fast response recovery speed and low working temperature. , the effect of good application prospects

Inactive Publication Date: 2017-07-28
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, NO applied to environmental monitoring 2 The sensor must have high sensitivity and low detection limit, in addition, in order to achieve real-time online measurement, it also needs to have a short response recovery time

Method used

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  • Graphene/tin dioxide quantum dot composite material-based NO2 sensor and preparation method thereof
  • Graphene/tin dioxide quantum dot composite material-based NO2 sensor and preparation method thereof
  • Graphene/tin dioxide quantum dot composite material-based NO2 sensor and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] (1) get the graphene / tin dioxide quantum dot composite material 0.2g that Graphene mass fraction is about 2% and 2g ethanol uniformly mix and form slurry; This slurry is evenly coated on the surface with a pair of testing gold electrodes Al 2 o 3 on the surface of the ceramic tube so that it completely covers the gold electrodes. Among them, the thickness of the graphene / tin dioxide quantum dot composite material is 15-30um; Al 2 o 3 The inner diameter of the ceramic tube is 0.8mm, the outer diameter is 1.2mm, and the length is 5mm; the width of a single gold electrode is 0.5mm, and the distance between two gold electrodes is 0.5mm; the length of the platinum wire drawn from the gold electrode is 5mm .

[0032] (2) Dry the ceramic tube coated with the graphene / tin dioxide quantum dot sensitive material at room temperature, and then transfer it to an oven at 80° C. to continue drying for 30 minutes. Next thread the NiCd alloy heating coil into the Al 2 o 3 The cer...

Embodiment 2

[0036] (1) get the graphene / tin dioxide quantum dot composite material 0.2g that Graphene mass fraction is about 2% and 2g ethanol uniformly mix and form slurry; This slurry is evenly coated on the surface with a pair of testing gold electrodes Al 2 o 3 on the surface of the ceramic tube so that it completely covers the gold electrodes. Among them, the thickness of the graphene / tin dioxide quantum dot composite material is 15-30um; Al 2 o 3 The inner diameter of the ceramic tube is 0.8mm, the outer diameter is 1.2mm, and the length is 5mm; the width of a single gold electrode is 0.5mm, and the distance between two gold electrodes is 0.5mm; the length of the platinum wire drawn from the gold electrode is 5mm .

[0037] (2) Dry the ceramic tube coated with the graphene / tin dioxide quantum dot sensitive material at room temperature, and then transfer it to an oven at 80° C. to continue drying for 30 minutes. Next thread the NiCd alloy heating coil into the Al 2 o 3 The cer...

Embodiment 3

[0041] (1) get the graphene / tin dioxide quantum dot composite material 0.2g that Graphene mass fraction is about 2% and 2g ethanol uniformly mix and form slurry; This slurry is evenly coated on the surface with a pair of testing gold electrodes Al 2 o 3 on the surface of the ceramic tube so that it completely covers the gold electrodes. Among them, the thickness of the graphene / tin dioxide quantum dot composite material is 15-30um; Al 2 o 3 The inner diameter of the ceramic tube is 0.8mm, the outer diameter is 1.2mm, and the length is 5mm; the width of a single gold electrode is 0.5mm, and the distance between two gold electrodes is 0.5mm; the length of the platinum wire drawn from the gold electrode is 5mm .

[0042] (2) Dry the ceramic tube coated with the graphene / tin dioxide quantum dot sensitive material at room temperature, and then transfer it to an oven at 80° C. to continue drying for 30 minutes. Next thread the NiCd alloy heating coil into the Al 2 o 3 The cer...

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Abstract

The invention discloses a graphene / tin dioxide quantum dot composite material-based NO2 sensor and a preparation method thereof, and belongs to the technical field of gas sensors. The NO2 sensor adopts a side-heating structure, and comprises a nickel-cadmium alloy heating coil, an Al2O3 ceramic tube, a sensitive layer, Pt conductive wires and two gold electrodes, wherein the nickel-cadmium alloy heating coil is positioned inside the Al2O3 ceramic tube and is used for heating the NO2 sensor; the two gold electrodes are positioned on the surface of the Al2O3 ceramic tube, each gold electrode is connected with the Pt conductive wire, and through measurement on the DC resistance values of the two gold electrodes in different atmospheres, a function of measuring the concentration of NO2 is achieved; the sensitive layer coats the Al2O3 ceramic tube and completely covers the two gold electrodes. By virtue of a synergistic effect of a composite material, a sensitive material has both a high specific surface area and a size effect, and the high-performance NO2 sensor is prepared; through change of the ratio of the graphene to tin dioxide quantum dots, the sensitive characteristic of the sensor can be controlled; the sensor prepared according to the preparation method provided by the invention has a good application prospect in environmental monitoring.

Description

technical field [0001] The invention belongs to the field of gas sensors, in particular to a resistive sensor based on a graphene / tin dioxide quantum dot composite material and a preparation method thereof, based on the resistance of the graphene / tin dioxide quantum dot composite sensitive film at working temperature changes to implement on the NO 2 detection. Background technique [0002] NO 2 It is a common polluting gas, which has a strong pungent smell and is seriously harmful. It is a double killer of the natural environment and human health. Nitrogen dioxide can cause a variety of environmental problems in a wide range. It is one of the main factors in the formation of photochemical smog and one of the sources of acid rain. Photochemical smog can seriously damage human and animal health, affect crop growth, damage building materials, and affect atmospheric visibility. Acid rain will change the pH value of the soil, hinder the growth of crops, cause agricultural pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 王振宇王延林李秋霖贾子光孙伟孙家斌
Owner DALIAN UNIV OF TECH
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