Application of a gas sensor and si-rgo composite material in the preparation of gas sensor

A gas sensor and composite material technology, applied in the direction of material resistance, analytical materials, and material electrochemical variables, can solve the problem of poor contact stability between graphene and silicon quantum dots, poor control of device uniformity, and no reports on gas sensors and other issues, to achieve the effect of low power consumption, stable structure, and low detection limit

Active Publication Date: 2022-06-21
SUZHOU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene and silicon quantum dot composite materials have been reported, but they are basically used in solar photovoltaic devices, and there are almost no reports in the field of gas sensors
There are many ways to combine the two, but most of them use physical methods to coat silicon quantum dots on the surface of graphene, resulting in poor contact stability between graphene and silicon quantum dots.
[0007] The semiconductor gas sensor combines sensitive materials with electrode devices, and monitors the resistance change after the sensitive material interacts with the gas to detect the gas concentration. At present, the methods of combining sensitive materials and electrodes mainly use drop coating, spin coating, printing, Sputtering and other methods, the way of coating, to a certain extent, the combination of materials and electrodes only depends on the van der Waals force, which is not very firm and easy to fall off, thus affecting the stability of the device, and the uniformity of the device cannot be well controlled; and The physical sputtering method is only suitable for materials that are easy to prepare targets, and requires relatively high costs

Method used

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  • Application of a gas sensor and si-rgo composite material in the preparation of gas sensor
  • Application of a gas sensor and si-rgo composite material in the preparation of gas sensor
  • Application of a gas sensor and si-rgo composite material in the preparation of gas sensor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) 45 mg of GO sheets were dissolved in 100 mL of deionized water as solution 1, 0.1 M aqueous ammonia solution as solution 2, and 0.1 M aqueous glucose solution as solution 3.

[0050] (2) 0.5 mL of silane coupling agent (KH-550) was added to 10 mL of solution 1, and the pH was adjusted to 8.5 by solution 2.

[0051] (3) 5 mL of ethanol was added to the solution obtained in step (2), and mixed uniformly by magnetic stirring, the stirring time was 180 min, and the reaction temperature was 25°C. After the reaction, the GO product grafted with Si quantum dots was obtained in the solution.

[0052] (4) 10 mL of solution 3 was slowly added dropwise to the solution obtained in step (3), and after magnetic stirring was uniformly mixed, the reaction was performed in a water bath at 80° C. for 30 min to obtain a Si-RGO composite material. The composite material is composed of RGO nanosheets and Si quantum dots grafted on its surface. The mass ratio of Si quantum dots and RGO ...

Embodiment 2

[0060] (1) 45 mg of GO sheets were dissolved in 100 mL of deionized water as solution 1, 0.1 M aqueous ammonia solution as solution 2, and 0.1 M aqueous glucose solution as solution 3.

[0061] (2) 0.5 mL of silane coupling agent (KH-550) was added to 10 mL of solution 1, and the pH was adjusted to 9.0 by solution 2.

[0062] (3) 10 mL of ethanol was added to the solution obtained in step (2), and mixed uniformly by magnetic stirring, the stirring time was 180 min, and the reaction temperature was 25°C. After the reaction, the GO product grafted with Si quantum dots was obtained in the solution.

[0063] (4) 30 mL of solution 3 was slowly added dropwise to the solution obtained in step (3), and after magnetic stirring was uniformly mixed, the reaction was carried out in a 40° C. water bath for 30 min to obtain a Si-RGO composite material. The composite material is composed of RGO nanosheets and Si quantum dots grafted on its surface. The mass ratio of Si quantum dots and RGO ...

Embodiment 3

[0068] (1) 45 mg of GO sheets were dissolved in 100 mL of deionized water as solution 1, 0.1 M aqueous ammonia solution as solution 2, and 0.5 M aqueous glucose solution as solution 3.

[0069] (2) 0.2 mL of silane coupling agent (KH-550) was added to 10 mL of solution 1, and the pH was adjusted to 9.5 by solution 2.

[0070] (3) 5 mL of ethanol was added to the solution obtained in step (2), and mixed uniformly by magnetic stirring, the stirring time was 180 min, and the reaction temperature was 25°C. After the reaction, the GO product grafted with Si quantum dots was obtained in the solution.

[0071] (4) 15 mL of solution 3 was slowly added dropwise to the solution obtained in step (3), and after magnetic stirring was uniformly mixed, the reaction was carried out in a 60° C. water bath for 30 min to obtain a Si-RGO composite material. The composite material is composed of RGO nanosheets and Si quantum dots grafted on its surface. The mass ratio of Si quantum dots and RGO i...

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Abstract

The invention relates to a Si-RGO composite material and its application in detecting nitrogen dioxide gas. Si quantum dots with a size of 2-5nm are in-situ modified on the surface of RGO nano-films by silicon sources, forming a heterogeneous structure with RGO as a conductive network and sensitive substrate in situ, and forming Si-RGO on the electrode surface by electrophoresis The gas sensitive film forms a gas sensor for detecting nitrogen dioxide gas. The Si-RGO gas-sensitive film is firmly bonded to the electrode, has excellent electrical conductivity, simple preparation process, mild reaction conditions, and is effective against NO at room temperature. 2 With high sensitivity and low detection limit, the sensing device has small volume, low power consumption and stable structure, and is suitable for large-scale preparation of gas-sensing sensing components.

Description

technical field [0001] The invention relates to the technical field of nitrogen dioxide gas sensors, in particular to a Si-RGO composite material and its application in detecting nitrogen dioxide gas. Background technique [0002] With the gradual improvement of people's safety awareness, the problem of environmental pollution has attracted people's attention. These environmental pollution problems include smog that has seriously affected people's quality of life in recent years, formaldehyde gas emitted from interior decoration materials, nitrogen oxides in automobile exhaust emissions, methane and petroleum liquefied gas in petroleum coal mines, etc. In order to protect people's health and safety and avoid accidents, the effective monitoring of flammable, explosive, toxic and harmful gases in life and various production sites is particularly important. At present, there are many commercialized sensors, but many of them have defects such as low sensitivity, high energy con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12G01N27/407G01N27/38
CPCG01N27/127G01N27/4073G01N27/38
Inventor 胡敬刘波李宛飞凌云魏涛程淼刘倩倩
Owner SUZHOU UNIV OF SCI & TECH
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