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An Au@ZnO core-shell heterojunction type triethylamine gas-sensitive sensor modified with boron-doped graphene and a preparing method thereof

A technology of graphene and boron doping, applied in the direction of instruments, scientific instruments, nanotechnology for materials and surface science, etc., can solve the problems of lack of stability test, lower operating temperature, and inability to judge performance, etc., to achieve large applications value, reduce operating temperature, and improve the effect of device sensitivity

Active Publication Date: 2018-12-04
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its operating temperature is still high and its power consumption is large, which limits its application in special environments
[0005] CN107337473A discloses in-situ growth of MoO on a ceramic tube 3 The nanosheet triethylamine gas sensor is mainly prepared by mixing the titanium oxide seed layer and the molybdenum oxide solution, impregnating the method combined with high-temperature calcination, and the gas sensor produced can realize the sensitive detection of triethylamine gas with a concentration of 50ppm, showing Higher selectivity, but operating temperature still needs to be lowered and lacks stability testing
The invention uses hydrothermal method combined with high temperature annealing to prepare NiO / Fe 2 o 3 Composite Sensitive Materials Utilizing NiO / Fe 2 o 3 The heterogeneous structure formed between them improves the detection ability of triethylamine, but its low-temperature gas-sensing performance and repeatability are not mentioned, and its specific performance cannot be judged.
[0007] In summary, the existing triethylamine sensors still have problems such as high working temperature and poor stability. Therefore, it is necessary to develop a new triethylamine gas sensor

Method used

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  • An Au@ZnO core-shell heterojunction type triethylamine gas-sensitive sensor modified with boron-doped graphene and a preparing method thereof
  • An Au@ZnO core-shell heterojunction type triethylamine gas-sensitive sensor modified with boron-doped graphene and a preparing method thereof
  • An Au@ZnO core-shell heterojunction type triethylamine gas-sensitive sensor modified with boron-doped graphene and a preparing method thereof

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Effect test

Embodiment 1

[0055] A method for preparing a boron-doped graphene-modified Au@ZnO core-shell heterojunction triethylamine gas-sensing material, comprising the following steps:

[0056] (1) Preparation of nuclear structure: using DC magnetron sputtering technology on SiO 2 (300nm) / Si substrate was sputter-deposited a 300nm-thick gold nanoparticle film with the same area as the substrate, sputtering power 30W, pressure 0.5Pa, argon flow 20SCCM, and then annealed at 900°C in an argon atmosphere 10min, the annealing heating rate is 10°C / min, to obtain uniform and isolated gold particles covering the surface of the substrate, the diameter of the Au particles is controlled at the level of 300nm, and the gold particles are in the (111) preferred orientation;

[0057] (2) Preparation of shell structure: continue to use DC magnetron sputtering technology to deposit a zinc film on the surface of the gold particles in step (1), so that the zinc film is coated on the surface of the gold particles, spu...

Embodiment 2

[0062] A method for preparing a boron-doped graphene-modified Au@ZnO core-shell heterojunction triethylamine gas-sensing material, comprising the following steps:

[0063] (1) Preparation of nuclear structure: using DC magnetron sputtering technology on SiO 2 (300nm) / Si substrate was sputter-deposited a 300nm-thick gold nanoparticle film with the same area as the substrate, with a sputtering power of 30W, a pressure of 0.5Pa, and an argon flow rate of 20SCCM; then annealed at 950°C in an argon atmosphere 10min, the annealing heating rate is 10°C / min, and the gold particles uniformly and isolatedly covering the surface of the substrate are obtained, the diameter of the Au particles is controlled at the level of 100nm, and the gold particles are in the preferred orientation of (111);

[0064] (2) Preparation of shell structure: continue to use DC magnetron sputtering technology to deposit a zinc film on the surface of the gold particles in step (1), so that the zinc film is coat...

Embodiment 3

[0069] A method for preparing a boron-doped graphene-modified Au@ZnO core-shell heterojunction triethylamine gas-sensing material, comprising the following steps:

[0070] (1) Preparation of nuclear structure: using DC magnetron sputtering technology on SiO 2 (300nm) / Si substrate was sputter-deposited a 300nm-thick gold nanoparticle film with the same area as the substrate, with a sputtering power of 30W, a pressure of 0.5Pa, and an argon flow rate of 20SCCM; then annealed at 1000°C in an argon atmosphere 10min, the annealing heating rate is 10°C / min, and the gold particles uniformly and isolatedly covering the surface of the substrate are obtained, the diameter of the Au particles is controlled at the level of 100nm, and the gold particles are in the preferred orientation of (111);

[0071] (2) Preparation of shell structure: continue to use DC magnetron sputtering technology to deposit a zinc film on the surface of the gold particles in step (1), so that the zinc film is coa...

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Abstract

The invention relates to an Au@ZnO core-shell heterojunction type triethylamine gas-sensitive sensor modified with boron-doped graphene and a preparing method thereof, and belongs to the field of triethylamine gas-sensitive sensors. The gas-sensitive material includes reduced graphene oxide loaded with boron atoms, Au particles and ZnO nanoparticles, wherein the Au particles adopted as a core structure are covered with the ZnO nanoparticles, the reduced graphene oxide loaded with boron atoms is adsorbed to the ZnO nanoparticles, the diameter of the Au particles is 100 nm to 1.5 [mu]m, the diameter of the ZnO nanoparticles is 30-50 nm, and the doping ratio of boron is 3-5%. By utilization of a high electron transfer speed of the core shell structure of the gas-sensitive material, the high specific surface area of a graphene material, characteristics of a boron-doped graphene p type semiconductor, and a characteristic that heterojunction construction of the shell-layer ZnO can improve gas sensitivity, the sensor capable of high-sensitivity detection of the triethylamine which is toxic and explosive gas at a near room temperature is prepared.

Description

technical field [0001] The invention relates to the field of triethylamine gas sensor, in particular to a core-shell heterojunction type triethylamine gas sensor and a preparation method thereof. Background technique [0002] Since the 1960s, when Seiyama and others first developed a flammable gas sensor using metal oxide semiconductors, metal oxide-based gas sensors have developed rapidly. With the advantages of simplicity and fast response and recovery, it has been widely used and developed rapidly in the three major fields of civil, industrial and environmental detection. However, this type of sensor still faces the problems of high operating temperature and high power consumption (>200°C) required by the device, which limits its further application. [0003] Triethylamine is a highly irritating, toxic and explosive gas, which is widely used in industrial fields such as anticorrosion, catalysis, and organic solvents. Generally, when the gas concentration is greater t...

Claims

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Application Information

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IPC IPC(8): G01N27/12B82Y30/00
CPCB82Y30/00G01N27/127
Inventor 慈立杰彭瑞芹李元元陈靖桦李德平
Owner SHANDONG UNIV
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