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Preparation method of graphene material resistance type gas sensing array and application method thereof

A technology of gas sensing and graphene, which is applied in the direction of analyzing materials, material resistance, chemical instruments and methods, etc., to achieve the effects of excellent gas sensing performance, favorable adsorption and diffusion, and low cost

Active Publication Date: 2019-12-31
HANGZHOU WELL HEALTHCARE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A single sensing element often cannot meet this need

Method used

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  • Preparation method of graphene material resistance type gas sensing array and application method thereof
  • Preparation method of graphene material resistance type gas sensing array and application method thereof
  • Preparation method of graphene material resistance type gas sensing array and application method thereof

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[0039] The invention discloses a method for preparing a graphene material resistive gas sensing array, which specifically includes the following steps:

[0040] Step 1: Add the metal salt solution to the graphene oxide solution, adjust the pH value of the mixed solution and perform ultrasonic dispersion, incubate the mixed solution on a shaker for 4-12 hours, wash it with deionized water until neutral, and then wash it with deionized water Disperse to obtain graphene oxide self-assembly suspension, change the ratio of metal salt solution and graphene oxide solution or change the type of metal salt solution and repeat the above process to configure multiple graphene oxide self-assembly suspensions, graphene oxide self-assembly The number of parts of the suspension is the same as the number of sites of the multi-site forked electrode array. Multiple parts of graphene oxide self-assembly suspensions are obtained by adding different metal salt solutions or changing the ratio of me...

Embodiment 1

[0050] This embodiment provides a method for preparing a three-site graphene material resistive gas sensing array using a cobalt chloride solution, and the specific steps are as follows:

[0051] Step 1, adding the cobalt chloride solution to the graphene oxide solution, the ratios of graphene oxide and cobalt chloride in the mixed solution are 1mg / mL: 15mM, 1mg / mL: 30mM, 1mg / mL: 45mM, adjust three The pH value of the mixed solution was 7.0 for ultrasonic dispersion. The three mixed solutions were incubated on a shaker for 8 hours, washed with deionized water to neutrality, and then dispersed with deionized water to obtain three kinds of cobalt ion-induced graphene oxide self-assembly Suspension.

[0052] Step 2: Add 5 μL of the three graphene oxide self-assembled suspensions prepared in Step 1 to the fingers of the three-point forked electrode array and dry naturally. The distance between the fingers is 100 μm. The array was placed in hydrazine hydrate vapor and reduced at 8...

Embodiment 2

[0054] This embodiment provides a method for preparing a five-site graphene material resistive gas sensing array using ferric chloride solution, and the specific steps are as follows:

[0055] Step 1, adding the ferric chloride solution to the graphene oxide solution, the ratios of graphene oxide and ferric chloride in the mixed solution are 1mg / mL: 5mM, 1mg / mL: 10mM, 1mg / mL: 20mM, 1mg / mL : 30mM, 1mg / mL: 40mM, adjust the pH value of the five mixed solutions to 3.0 and carry out ultrasonic dispersion, incubate the five mixed solutions on a shaker for 6 hours, wash with deionized water until neutral, and then wash with deionized water Disperse to obtain five iron ion-induced graphene oxide self-assembly suspensions.

[0056] Step 2: Add 2.5 μL of the five graphene oxide self-assembled suspensions prepared in step 1 to the fingers of the five-point fork-shaped electrode array and dry naturally. The distance between the fingers is 100 μm. The electrode array was placed in hydrazi...

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Abstract

The invention discloses a preparation method of a graphene material resistance type gas sensing array and an application method thereof. The preparation method comprises the following steps: adding ametal salt solution into a graphene oxide solution, adjusting a pH value of the mixed solution, carrying out ultrasonic dispersion, incubating the mixed solution on an oscillator for 4 to 12h, carrying out washing with deionized water and carrying out dispersion with deionized water to obtain a metal ion-induced graphene oxide self-assembled suspension, and changing configuration conditions to prepare a plurality of parts of metal ion-induced graphene oxide self-assembled suspensions; adding the plurality of parts of metal ion-induced graphene oxide self-assembled suspensions to interdigitalsof a multi-site fork-shaped electrode array respectively, carrying out natural drying, placing a product in reducing steam at a temperature of 60 to 120 DEG C for 3 to 30 minutes. With the disclosed preparation method, the uniform loading of the graphene material on the substrate is realized and the provided resistance type gas sensing array has the recognition capability on single gas and complexgas. The preparation method can be used for preliminary diagnosis of diseases, personal health monitoring and food and public safety monitoring.

Description

technical field [0001] The invention relates to a preparation method of a graphene material resistive gas sensing array and an application method thereof. Background technique [0002] Human exhaled air is regarded as blood-head air, which can reflect the overall physiological condition of the individual. The detection of exhaled gas is a completely non-invasive diagnostic method with unlimited sample sources. It is a potential supplement to traditional biochemical detection (blood test, urine test, section, imaging, etc.), and can be used for disease screening and personal fields of health management. As early as 1999, Phillips et al. reported that there were more than 3,000 volatile organic compounds in the exhaled air of the human body, and this number is still rising. Acetone and isoprene were the two most prevalent endogenous VOCs in numerous studies. Among them, acetone is related to glucose metabolism and lipolysis, and the concentration of isoprene is related to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/126C01B32/198G01N27/127G01N33/4975G01N27/125G01N27/129G01N33/0027C01B32/184C01B2204/22C01P2004/03G01N33/497
Inventor 邬建敏陈巧芬
Owner HANGZHOU WELL HEALTHCARE TECH CO LTD
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