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A kind of preparation method of ammonia gas sensor based on graphene/polypyrrole

An ammonia gas sensor, polypyrrole technology, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of poor gas selectivity, poor repeatability, and high device power consumption, and achieve high durability, material durability, and gas selective effect

Active Publication Date: 2022-04-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing sensors using graphene as a sensitive material have shortcomings such as unstable sensing, poor gas selectivity, fast material loss, high device power consumption, and poor repeatability, which cannot meet the growing sensing needs

Method used

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  • A kind of preparation method of ammonia gas sensor based on graphene/polypyrrole
  • A kind of preparation method of ammonia gas sensor based on graphene/polypyrrole
  • A kind of preparation method of ammonia gas sensor based on graphene/polypyrrole

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Effect test

Embodiment l

[0053] A kind of preparation method of the ammonia gas sensor based on graphene / polypyrrole, the method comprises the following steps:

[0054] (1) Prepare a single-layer graphene film by chemical vapor deposition: cut a copper foil with a thickness of 0.3mm into a square with a side length of 50mm, clean it sequentially with acetone, isopropanol and deionized water, and then put it into argon gas in the tube furnace. Then 50 sccm of hydrogen and 50 sccm of argon were bubbled into the chamber at 1000° C. for 10 minutes. The pressure in the chamber was then reduced to 60 Pa. After entering the growth stage, 5 sccm hydrogen gas and 25 sccm methane gas were introduced to deposit single-layer graphene on the copper foil. Finally, 50 sccm of argon and 5 sccm of hydrogen were passed through the tube furnace to cool the sample to room temperature. The transparency of the prepared graphene is >95%, and the number of layers is <3.

[0055] (2) Using ultraviolet lithography technolo...

Embodiment 2

[0062] A kind of preparation method of the ammonia gas sensor based on graphene / polypyrrole, the method comprises the following steps:

[0063] (1) Prepare a single-layer graphene film by chemical vapor deposition: cut a copper foil with a thickness of 0.3mm into a square with a side length of 50mm, clean it sequentially with acetone, isopropanol and deionized water, and then put it into argon gas in the tube furnace. Then 50 sccm of hydrogen and 50 sccm of argon were bubbled into the chamber at 1000° C. for 10 minutes. The pressure in the chamber was then reduced to 60 Pa. After entering the growth stage, 5 sccm hydrogen gas and 25 sccm methane gas were introduced to deposit single-layer graphene on the copper foil. Finally, 50 sccm of argon and 5 sccm of hydrogen were passed through the tube furnace to cool the sample to room temperature. The transparency of the prepared graphene is >95%, and the number of layers is <3.

[0064] (2) Using ultraviolet lithography technolo...

Embodiment 3

[0071] A kind of preparation method of the ammonia gas sensor based on graphene / polypyrrole, the method comprises the following steps:

[0072] (1) Prepare a single-layer graphene film by chemical vapor deposition: cut a copper foil with a thickness of 0.3mm into a square with a side length of 50mm, clean it sequentially with acetone, isopropanol and deionized water, and then put it into argon gas in the tube furnace. Then 50 sccm of hydrogen and 50 sccm of argon were bubbled into the chamber at 1000° C. for 10 minutes. The pressure in the chamber was then reduced to 60 Pa. After entering the growth stage, 5 sccm hydrogen gas and 25 sccm methane gas were introduced to deposit single-layer graphene on the copper foil. Finally, 50 sccm of argon and 5 sccm of hydrogen were passed through the tube furnace to cool the sample to room temperature. The transparency of the prepared graphene is >95%, and the number of layers is <3.

[0073](2) Electrode patterns are constructed on t...

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Abstract

The invention discloses a graphene / polypyrrole-based ammonia sensor and a preparation method thereof. The material includes layered graphene, the surface of which is in situ polymerized with layered polypyrrole. The method has a simple process, and two gas-sensing materials, graphene and polypyrrole, are compounded in a layered / layered form, so that the gas-sensing composite material has good gas selectivity, high gas responsivity, low detection limit, high surface smoothness, It has the advantages of adjustable material thickness, stable chemical properties, long service life and good material durability.

Description

technical field [0001] The invention relates to the field of gas sensors, in particular to an ammonia sensor and a preparation method thereof. Background technique [0002] Ammonia is a colorless gas with a pungent odor, and it is also a poisonous and harmful gas that can cause harm to the human body. At the same time, ammonia is indispensable in industrial production, agriculture, higher education, research institutions and other fields. For example, ammonia is an important raw material for the synthesis of nitrogen fertilizers, and it can also be used to prepare liquid ammonia refrigerants with excellent performance. Therefore, high-performance ammonia sensors are indispensable, and currently higher requirements are put forward for the miniaturization and weight reduction, energy consumption, responsivity, sensitivity, durability and other performance of ammonia sensors. [0003] Graphene is currently the most widely used and ideal sensitive material for making gas sensor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12G01N27/416
CPCG01N27/4162G01N27/126G01N27/127
Inventor 陶立徐骁詹科鲍晨旭陈启超王哲涵陈佳熠
Owner SOUTHEAST UNIV
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