Graphene test paper and preparation thereof and liquid analyzing method based on test paper

Abstract

The invention relates to graphene test paper and preparation thereof and a liquid analyzing method based on the test paper, and belongs to the technical fields of liquid sensing elements and liquid analyzing. The test paper comprises a film substrate, a thin film structure and a contact electrode, wherein the thin film structure is formed by stacking graphene layer sheets and is tightly bonded with the film substrate; an auxiliary film forming agent and chemical sniffing molecules are attached to each graphene layer sheet. The preparation method comprises the following steps of dispersing the graphene layer sheets, the auxiliary film forming agent and the chemical sniffing molecules into a solvent, so as to prepare graphene conductive ink; depositing the graphene layer sheets in the graphene conductive ink onto the film substrate, and then setting the contact electrode, so as to obtain the graphene test paper with good strength, flexibility and chemical sensitivity. The liquid analyzing method using the test paper is used for analyzing multiple types of liquids, such as organic solvent, salt solutions and beverages, and has the advantages that the demand amount of samples is small, the detection time is short, the manufacturing cost of instruments and reagents is low, and the like.

Description

technical field [0001] The invention relates to a graphene test paper and a preparation method thereof, as well as a liquid analysis system and a liquid analysis method based on the graphene test paper, which belong to the technical field of liquid sensing elements and their preparation, and also relate to liquid analysis and detection technology. Background technique [0002] In the field of liquid sensing technology, those skilled in the art have developed various detection methods for liquid analysis. Traditional chemical analysis methods (such as Kjeldahl method, various chemical titration, etc.) can achieve targeted quantitative or qualitative analysis, but they are not portable and the method is very complicated. Single property detectors such as surface tension testers, viscosity testers and other instruments can achieve rapid detection, but the scope of application is relatively limited. Large-scale precision instruments such as liquid chromatography, fiber optic de...

AI Technical Summary

Problems solved by technology

Traditional chemical analysis methods (such as Kjeldahl method, various chemical titrations, etc.) can achieve targeted quantitative or qualitative analysis, but they are not portable and the method is very complicated

Single property detectors such as surface tension testers, viscosity testers and other instruments can achieve rapid detection, but the scope of application is relatively limited

Large-scale precision instruments such as liquid chromatography, optical fiber detectors or infrared spectroscopy need to invest a lot of equipment reagent costs, personnel training costs, relatively high detection conditions, it is difficult to achieve flexibility and portability

Artificial electronic tongue liquid analysis system (such as electronic tongue based on biofilm or field effect transistor) can realize composite liquid analysis, but it is difficult to achieve flexibility due to structural factors, and the detection conditions are relatively high

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