Gas sensor based on covalent organic frame material and preparation method thereof

A covalent organic framework, gas sensor technology, applied in the direction of analysis of materials, material analysis by optical means, instruments, etc., can solve the problems of COF device processing difficulties, limited development prospects of COF, limited application scope, etc., and achieves a simple detection method. , The effect of a wide range of applications and a simple production process

Active Publication Date: 2019-11-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of COF is in the form of solid powder. In the preparation of COF devices, there are problems such as processing difficulties, low stability, and limited application range, which limit the development prospects of COF in sensors.

Method used

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  • Gas sensor based on covalent organic frame material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Synthesis of COF-1 on a gold-plated silicon wafer

[0021]Dissolve 0.05 mmol of trimesin in 5 ml of mesitylene / dioxane solvent, add 0.3 mmol of aniline as an interface modifier to obtain the first solution; 0.05 mmol of 1,3,5-tris (4-Aminophenyl) benzene was dissolved in 5 ml of mesitylene / dioxane (2:1, v / v) solvent, and 0.3 mmol of benzaldehyde was added as an interface modifier to obtain a second solution; After the first solution and the second solution are mixed evenly, then a gold-plated silicon wafer is added, and finally scandium trifluoromethanesulfonate with a concentration of 5 mol / L is added. React at room temperature for three days to obtain a supported film, immerse the obtained supported film in a mixed solution of ethanol / water (v / v, 1 / 1), take it out and dry it after being treated under ultrasonic conditions, and obtain a composite of the supported film structure. Gas sensors based on valent organic framework materials. After the sensor is i...

Embodiment 2

[0022] Example 2: Synthesis of COF-2 on a gold-plated silicon wafer

[0023] 6mmol of 1,4-terephthalaldehyde was dissolved in 5ml of formic acid solvent, and 96mmol of 2-chloroaniline was added as an interface modifier to obtain the first solution; 4mmol of 1,3,5-tri(4-amino Phenyl)benzene was dissolved in 5ml of formic acid solvent, and 96mmol of 2-nitrobenzaldehyde was added as an interface modifier to obtain a second solution; after the first solution and the second solution were mixed evenly, then gold-plated silicon piece. React at room temperature for three days to obtain a loaded film, immerse the obtained loaded film in deionized water, take it out and dry it after being treated under ultrasonic conditions, and obtain a gas sensor of a covalent organic framework material with a supported film structure. After the sensor is in contact with acetone gas, the color changes from orange to green, and the response time is 70ms.

Embodiment 3

[0024] Example 3: Synthesis of COF-3 on silver-coated silicon wafers

[0025] 30mmol of 5,10,15,20-tetrakis(4-aminophenyl)porphyrin was dissolved in 5ml of benzoic acid solvent, and 3mol of 2-methylbenzaldehyde was added as an interface modifier to obtain the first solution; 40mmol of 2,4,6-trihydroxy-pyrylene tricarbaldehyde was dissolved in 5ml of benzoic acid solvent, and 3mol of 4-tert-butylaniline was added as an interface modifier to obtain a second solution; the above-mentioned first solution and the second After the solution is well mixed, the silver-coated silicon chips are then added. Reacting at room temperature for three days to obtain a loaded film, immersing the obtained loaded film in ethylene glycol solvent, taking out and drying to obtain a gas sensor of a covalent organic framework material with a supported film structure after being treated under ultrasonic conditions. After the sensor is in contact with dichloromethane gas, the color changes from yellow to...

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Abstract

The invention discloses a gas sensor based on a covalent organic frame material and a preparation method thereof, and belongs to the application field of the covalent organic frame material. Accordingto the method, a first monomer A is dissolved in a first solvent and a first interface modifier is added so as to obtain a first solution; a second monomer B is dissolved in a second solvent and a second interface modifier is added so as to obtain a second solvent; and a support substrate and a reaction catalyst are added after the solvent is uniformly mixed so that load type gas sensor can be obtained and a self-supporting type gas sensor can also be obtain by treating with an etching solution. The sensor can adsorb the solvent molecules into the pores to change the refractive index of the sensor so that rapid and significant color change occurs, and optical sensing and detection of organic vapor or water vapor can be realized.

Description

technical field [0001] The invention belongs to the application field of covalent organic framework materials, in particular to a gas sensor based on covalent organic framework materials and a preparation method thereof. Background technique [0002] Covalent organic framework (COF) is a kind of porous organic material with rich pore structure and large specific surface area, which has broad application prospects. However, a large amount of COF is in the form of solid powder. In the preparation of COF devices, there are problems such as processing difficulties, low stability, and limited application range, which limit the development prospects of COF in sensors. Contents of the invention [0003] The purpose of the present invention is to address the shortcomings of existing COF sensors, to provide a gas sensor based on a covalent organic framework material and its preparation method, a loaded COF film sensor prepared by a direct synthesis method, and an etched substrate. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/01C08G83/00
CPCC08G83/008G01N21/01G01N21/31
Inventor 刘平伟张弛王崧王文俊
Owner ZHEJIANG UNIV
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