Novel ammonia sensor and preparation technology thereof

An ammonia gas sensor and a preparation process technology, which are applied in the field of sensors, can solve problems such as poor ammonia gas selectivity of gas-sensitive thin films, and achieve the effects of improving electron transmission performance, high gas-sensing performance, and increasing effective contact area.

Inactive Publication Date: 2015-03-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the graphene nano-sheet structure and tin dioxide nano-crystal particle structure make the gas-sensitive film have poor selectivity to ammonia gas, and the adsorption capacity of gas needs to be optimized, and the obtained nano-sheet structure graphene is easily oxidized graphene oxide

Method used

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  • Novel ammonia sensor and preparation technology thereof
  • Novel ammonia sensor and preparation technology thereof
  • Novel ammonia sensor and preparation technology thereof

Examples

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Effect test

Embodiment 1

[0044] A new type of ammonia gas sensor, including a gas-sensitive material and a substrate. The gas-sensitive material is evenly coated on the surface of the substrate. The coating thickness of the gas-sensitive material is 100μm. The composition of the gas-sensitive material includes reducing graphene wrapped cobalt tetroxide composite nanofibers. The graphene-coated cobalt tetroxide composite nanofibers include reduced graphene and cobalt tetroxide. The reduced graphene is wrapped on cobalt tetroxide. The mass fraction of the composite nanofibers is 1%. The average diameter of the composite nanofibers is 1%. It is 200nm, the average diameter of Co3O4 is 20nm, the preparation method includes the following steps:

[0045] Step 1, preparing a graphene oxide dispersion: disperse 0.02 parts by mass of graphene oxide into 0.06 parts by mass of dimethylformamide, and ultrasonicate in a 250W ultrasonic machine for 4 hours to obtain a graphene oxide dispersion;

[0046] Step two, prepare...

Embodiment 2

[0052] A new type of ammonia gas sensor, including a gas-sensitive material and a substrate. The gas-sensitive material is uniformly coated on the surface of the substrate. The coating thickness of the gas-sensitive material is 1μm. The composition of the gas-sensitive material includes reducing graphene wrapped cobalt tetroxide composite nanofibers. The graphene-coated cobalt tetroxide composite nanofibers include reduced graphene and cobalt tetroxide. The reduced graphene is wrapped on cobalt tetroxide. The mass fraction of the composite nanofibers is 6%. The average diameter of the composite nanofibers is 6%. It is 250nm, the average diameter of Co3O4 is 30nm, and the preparation method includes the following steps:

[0053] Step one: preparing a graphene oxide dispersion: disperse 0.05 parts by mass of graphene oxide into 2 parts by mass of dimethylformamide, and sonicate it in a 250W ultrasonic machine for 2 hours to obtain a graphene oxide dispersion;

[0054] Step two, prepa...

Embodiment 3

[0059] A new type of ammonia gas sensor, including a gas-sensitive material and a substrate. The gas-sensitive material is uniformly coated on the surface of the substrate. The coating thickness of the gas-sensitive material is 50μm. The composition of the gas-sensitive material includes reducing graphene wrapped cobalt tetroxide composite nanofibers. The graphene-coated cobalt tetroxide composite nanofibers include reduced graphene and cobalt tetroxide. The reduced graphene is wrapped on cobalt tetroxide. The reduced graphene accounts for 10% of the composite nanofibers. The average diameter of the reduced graphene-coated cobalt tetroxide composite nanofibers It is 300nm, the average diameter of Co3O4 is 40nm, the preparation method includes the following steps:

[0060] Step one: preparing a graphene oxide dispersion: disperse 1.6 parts by mass of graphene oxide into 8 parts by mass of dimethylformamide, and ultrasonicate in a 250W ultrasonic machine for 5 hours to obtain a grap...

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Abstract

The invention belongs to the technical field of sensors, and particularly relates to a novel ammonia sensor and a preparation technology thereof. The novel ammonia sensor comprises a gas sensitive material and a substrate, wherein the gas sensitive material uniformly coats the surface of the substrate uniformly, and comprises the component of reducing graphene which is wrapped with a cobaltosic oxide composite nano material; the coating thickness of the gas sensitive material is 1micron-100microns. The ammonia sensor is relatively high in responsiveness of an ammonia gas, and meanwhile has the advantages of relatively good selectivity, flexibility and stability and relatively low operation temperature.

Description

Technical field [0001] The invention belongs to the technical field of sensors, and specifically relates to a novel ammonia gas sensor and a preparation process thereof. Background technique [0002] Gas sensors are mainly used for the detection of various gases, especially environmental gases. The requirements for pollution control of toxic and harmful gases in the environment have accelerated the research of gas sensors. The gas sensor in the prior art is mainly used for the detection of carbon monoxide gas, the detection of methane gas, the detection of coal gas, the detection of freon (R11, R12), the detection of alcohol in breath, the detection of human oral malodor and so on. It converts the type of gas and its concentration-related information into electrical signals. According to the strength of these electrical signals, information related to the presence of the gas to be measured in the environment can be obtained, so that it can be detected, monitored, and alarmed; I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 李晓干王兢冯秋霞
Owner DALIAN UNIV OF TECH
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