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Volatile organic pollutant detector and preparation method thereof

A volatile organic and pollutant technology, applied in the direction of material resistance, can solve the problems of harsh working environment, high working temperature, low sensitivity, etc., and achieve the effect of improving sensitivity, improving characterization ability, and high sensitivity

Pending Publication Date: 2022-07-29
WESTLAKE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems such as high working temperature (up to 400 degrees Celsius), harsh working environment (inert gas protection), low sensitivity (greater than 1 mg per liter), etc.

Method used

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  • Volatile organic pollutant detector and preparation method thereof
  • Volatile organic pollutant detector and preparation method thereof
  • Volatile organic pollutant detector and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] Please refer to figure 2 , a preparation method of a detector for detecting volatile organic pollutants, comprising the steps of:

[0048] Site-directed defect modification of the sensing material and doping of a mixture of tetramethylammonium hydroxide and polydimethylglutarimide;

[0049] Fabrication of field effect transistors based on defect-modified and doped sensing materials;

[0050] The detector for detecting volatile organic pollutants is prepared according to the field effect transistor.

[0051] It can be seen from the above description that the sensing material obtained by doping the sensing material with a mixture of tetramethylammonium hydroxide and polydimethylglutarimide after the fixed-point defect modification is used to prepare a field effect transistor can improve the volatilization rate. Sensitivity of an organic pollutant detector at a lower cost and simpler procedures.

[0052] Further, the preparation of the field effect transistor includes: ...

Embodiment 1

[0076] Please refer to figure 1 , a volatile organic pollutant detector, comprising an electrical signal conductor 8 and an electrical signal analyzer 9; the electrical signal conductor 8 is a field effect transistor type electrical signal conductor 8;

[0077] the field effect transistor includes an inductive material;

[0078] The sensing material is subjected to site-specific defect modification and doping of a mixture of Tetramethy1ammoniumhydroxide13 and Polydimethylglutarimide;

[0079] Wherein, the field effect transistor includes an inductive material layer, an active site layer 6 and an electrode region doping layer 4; the inductive material layer includes an inductive material.

[0080] The sensing material is a single-layer two-dimensional material, and the single-layer two-dimensional material may be two-dimensional materials such as molybdenum disulfide, boron nitride, graphene, graphene oxide, gallium arsenide, and gallium nitride. The single-layer two-dimensio...

Embodiment 2

[0093] Please refer to figure 2 , a preparation method of a detector for detecting volatile organic pollutants, comprising the steps of:

[0094] S1, performing fixed-point defect modification on the sensing material and doping of a mixture of tetramethylammonium hydroxide 13 and polydimethylglutarimide 10;

[0095] Specifically, silicon with a thickness of 500 microns is selected as the gate substrate 1;

[0096] S101, oxidizing the gate substrate 1 so that a silicon dioxide gate oxide layer 2 is grown on the surface, such as figure 2 as shown in a;

[0097] Wherein, the thickness of the gate oxide layer 2 is 185 nanometers, and the optical reflection contrast of the single-layer two-dimensional material under this thickness is the highest, which is beneficial to the subsequent transfer and positioning of the two-dimensional material;

[0098] S102, transfer the molybdenum disulfide layer 3 as the sensing material on the side of the gate oxide layer 2 away from the gate ...

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Abstract

The invention discloses a volatile organic pollutant detector and a preparation method thereof. A scanning probe technology is utilized to increase the total amount, variety and distribution of active sites of a sensing material single-layer molybdenum disulfide, promote physical or chemical combination of the sensing material single-layer molybdenum disulfide and trace volatile organic pollutant molecules, and generate tiny electrical property modulation. Meanwhile, through combination of a scanning probe technology and a unique chemical doping phenomenon after mixing of tetramethylammonium hydroxide and polydimethylglutarimide, an electrode micro-area of the field effect transistor type electric signal conductor is doped, so that the Schottky barrier and the contact resistance are reduced, and the conductivity of the field effect transistor type electric signal conductor is improved. According to the present invention, the sensing material is used as the sensing material, the characterization ability of the sensing material on the weak electrical characteristic modulation is improved, the electrical signal is transmitted to the picoampere-level electrical signal analyzer, and the portable molybdenum disulfide volatile organic pollutant detector is finally obtained, the sensitivity can achieve 0.001 mg / L, and the requirement of the detection on the safe concentration of the volatile organic pollutant is met.

Description

technical field [0001] The invention relates to the field of gas detector detection, in particular to the technical field of volatile organic pollutant detection. Background technique [0002] Volatile organic pollutants are a general term for various organic pollutants with a boiling point of less than 260 degrees Celsius, and their main components include alkanes, aromatic hydrocarbons, alkenes, halogenated hydrocarbons, esters, aldehydes and ketones. Most volatile organic pollutants are toxic and bring great harm to the natural environment, ecological environment and life and health. Threats to life and health such as carcinogenicity. And most of the volatile organic pollutants are colorless, odorless, and difficult to detect. They exist in every aspect of people's daily life like invisible killers, quietly endangering people's life and health. Therefore, the detection and monitoring of volatile organic pollutants is crucial, and needs to meet the needs of high sensitiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/126G01N27/125
Inventor 郑小睿
Owner WESTLAKE UNIV
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