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Carbon dot-doped molybdenum disulfide sheet-based humidity sensor and preparation method thereof

A technology of humidity sensor and molybdenum disulfide, which is applied in the field of gas sensing, can solve the problems of long response time and low humidity response sensitivity, and achieve the effects of fast response speed, low price and excellent humidity response performance

Active Publication Date: 2018-06-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the existing molybdenum disulfide sensor has low sensitivity to humidity response and long response time

Method used

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  • Carbon dot-doped molybdenum disulfide sheet-based humidity sensor and preparation method thereof
  • Carbon dot-doped molybdenum disulfide sheet-based humidity sensor and preparation method thereof
  • Carbon dot-doped molybdenum disulfide sheet-based humidity sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1. Preparation of composites and humidity sensors based on carbon dot-doped molybdenum disulfide flakes

[0055] Step 1: Add 300 mg of L-glutamic acid into 30 mL of water, disperse evenly, transfer to a reaction kettle, heat at 200°C for 12 hours, and cool to obtain a carbon dot aqueous solution;

[0056] Step 2: Add 900 mg of sodium molybdate and 390 mg of thiourea to the 30 mL carbon dot aqueous solution obtained in the above step 1, disperse to obtain a uniform solution, and then transfer it to the reaction kettle. Heating at 200°C for 24 hours to obtain a crude solid compound based on carbon dots doped with molybdenum disulfide;

[0057] The solid crude product was alternately washed 3 times with deionized water and ethanol, and centrifuged at a centrifugation speed of 7000rpm for 10min to obtain a composite based on carbon dot-doped molybdenum disulfide flakes;

[0058] Step 3: Dissolve the compound based on carbon dot-doped molybdenum disulfide flakes obt...

Embodiment 2

[0060] Example 2, Preparation of composites and humidity sensors based on carbon dot-doped molybdenum disulfide flakes

[0061] Step 1, add 1200mg of L-glutamic acid into a round bottom flask, heat to 250°C until L-glutamic acid melts into a yellow-brown liquid, add 90mL of deionized water, dissolve and centrifuge to remove large particles to obtain carbon point water solution;

[0062] Step 2: Add 600 mg of sodium molybdate and 390 mg of thiourea to the 30 mL carbon dot aqueous solution obtained in the above step 1, disperse to obtain a uniform solution, and then transfer it to the reaction kettle. Heating at 160°C for 36 hours to obtain a solid crude product based on carbon dot-doped molybdenum disulfide composite;

[0063] The solid crude product was alternately washed three times with deionized water and ethanol, and centrifuged at a centrifugation speed of 5000 rpm for 30 min to obtain a composite based on carbon dot-doped molybdenum disulfide flakes.

[0064] Step 3: D...

Embodiment 3

[0065] Example 3, Preparation of composites and humidity sensors based on carbon dot-doped molybdenum disulfide flakes

[0066] Step 1: Add 300 mg of L-cysteine ​​to 15 mL of water, disperse evenly, transfer to a microwave reaction bottle, and microwave at 200°C for 30 minutes to obtain an aqueous solution of carbon dots;

[0067] Step 2: Add 1200 mg of sodium molybdate and 390 mg of thiourea to the 30 mL carbon dot aqueous solution obtained in the above step 1, disperse to obtain a uniform solution, and then transfer it to the reaction kettle. Heating at 240°C for 12 hours to obtain a solid crude product based on carbon dot-doped molybdenum disulfide composite;

[0068] The solid crude product was alternately washed three times with deionized water and ethanol, and centrifuged at a centrifugation speed of 8000 rpm for 8 min to obtain a composite based on carbon dot-doped molybdenum disulfide flakes.

[0069] Step 3: Dissolve the compound based on carbon dot-doped molybdenum ...

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Abstract

The invention discloses a carbon dot-doped molybdenum disulfide sheet-based composite, wherein the carbon dot-doped molybdenum disulfide sheet composite is in a shape of a two-dimensional nano sheet.The present invention also provides a preparation method and use of the carbon dot-doped molybdenum disulfide sheet-based composite. The present invention also provides a humidity sensor including thecarbon dot-doped molybdenum disulfide sheet-based composite and a preparation method and use thereof. The carbon dot-doped molybdenum disulfide sheet-based composite and the humidity sensor includingthe carbon dot-doped molybdenum disulfide sheet-based composite are wide in response range and linear in response, and have fast response, high sensitivity, and excellent repeatability.

Description

technical field [0001] The invention relates to the technical field of gas sensing, in particular to a humidity sensor based on a molybdenum disulfide flake modified by carbon dot doping and a preparation method thereof. Background technique [0002] Humidity is an important parameter in environmental assessment because it is inextricably linked to many things in the environment. In addition, humidity has a non-negligible impact on industrial production and technological development. The measurement and continuous monitoring of humidity is very important in many fields such as semiconductor manufacturing, packaging industry, soil moisture monitoring, pharmaceutical and food processing, civil engineering, electronic processing, household appliances and air conditioning systems. According to a recent survey, the humidity sensor market share is expected to reach USD 2.3 billion by 2020. It can be seen that it is an urgent need for the development of today's society to develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 杨志何桂丽胡南滔苏言杰周志华张亚非
Owner SHANGHAI JIAO TONG UNIV
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