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Preparation method and application of graphene oxide array color-changing film/composite film

A graphene array and color-changing film technology, applied in the field of chemical materials, can solve the problems of poor repeatability, uneven size, and disorder of optical properties of materials, and achieve fast, accurate and visual detection effects

Active Publication Date: 2018-02-02
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the present invention will solve the problem of poor repeatability of the optical properties of the material due to the uneven size, disorder, and easy folding of graphene itself through simple and controllable assembly of graphene sheets.

Method used

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  • Preparation method and application of graphene oxide array color-changing film/composite film
  • Preparation method and application of graphene oxide array color-changing film/composite film

Examples

Experimental program
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Effect test

Embodiment 1

[0058] The preparation method of graphene oxide array color-changing film comprises the following steps:

[0059] (1) The synthetic method of graphene oxide is as follows:

[0060] Into a 250 mL round bottom flask was added the obtained pre-oxidized graphene product and 20 mL of H 2 SO 4 , slowly add 2.5g KMnO in ice-water bath at 0℃ 4 . The reaction was carried out at 35°C for 2 hours. Slowly add 116.5mL of deionized water dropwise, and after 2 hours of reaction, add dropwise 3.3mL of H 2 o 2 (30%), the solution turned bright yellow. Wash with 1M HCl and deionized water until the pH of the solution reaches 6 to obtain a graphene oxide aqueous solution, and centrifuge and sonicate to obtain graphene oxide.

[0061] (2) Disperse the graphene oxide prepared by the above method into water and prepare solutions of different concentrations: [c]=3mg / mL, 4mg / mL, 5mg / mL, 6mg / mL; obtain different concentrations of graphite oxide Alkene solution;

[0062] From attached figure ...

Embodiment 2

[0068] On the basis of the film obtained in Example 1, the graphene oxide solution with a concentration of 3 mg / mL was again spin-coated to obtain a graphene oxide film, and so repeatedly spin-coated to obtain an array of graphene oxide films, and the spin-coating conditions were the same as in the embodiment 1.

Embodiment 3

[0070] To obtain the preparation of graphene oxide composite film, graphene oxide is combined with PDDA solution to prepare graphene oxide array color-changing composite film, and its specific steps are as follows:

[0071] (1) adopt improved Hummers method to prepare graphene oxide (with embodiment 1, below if no special instructions, all adopt the Hummers method of embodiment 1 to prepare graphene oxide);

[0072] (2) prepare graphene oxide solution;

[0073] (3) To modify the silicon wafer substrate, mix concentrated sulfuric acid with a mass concentration of 98% and hydrogen peroxide with a mass concentration of 30% according to a volume ratio of 7:3 to prepare a solution A. Soak the silicon wafer in solution A and treat it at 90°C for 1.5 hours. Wash the hydrophilically treated silicon wafers with deionized water and dry them for later use.

[0074] (4) Preparation of polymer solution:

[0075] Preparation of PDDA solution: Take 0.75mL PDDA (20wt%), add 100mL deionized...

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Abstract

The invention belongs to the technical field of chemical materials, and particularly relates to a preparation method of a graphene oxide film or composite film capable of presenting different colors in different gas environments. The graphene oxide film can be applied in preparing gas sensors for detecting humidity and harmful gas. The preparation method specifically includes: preparing a grapheneoxide solution and a macromolecular solution, sequentially spin-coating the solutions on a modified silicon wafer substrate through a spin coater, and drying to obtain a color-changing graphene oxide / macromolecular composite film. Dispersity and selectivity of a graphene gas-sensitive material are improved; functionalized macromolecules are introduced, so that graphene lamellar structure is stabilized while gas-sensitive selection is improved, and a graphene / macromolecular schemochrome thin film which is flat and controllable in number of layer is prepared; a characteristic that conventionalgraphene gas-sensitive materials depend on electrochemical detection is broken through, an organic small molecule visual detection assembly array based on interference light response is built, and real-time, quick, accurate and visual detection of humidity and harmful gas is realized.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and in particular relates to a method for preparing a graphene oxide film capable of displaying different colors in different gas environments. The graphene oxide film can be applied to the preparation of gas sensors for humidity and harmful gases. Background technique [0002] Volatile organic pollutants (VOCs) from industrial production and transportation have become the most common harmful gases. The emission of VOCs in my country exceeds 20 million tons per year, causing lasting harm to human health. Graphene has become one of the most promising gas-sensing materials due to its monoatomic layer thickness, high carrier mobility, and large specific surface area. However, the dependence on electrochemical signal output, easy aggregation, and poor selectivity limit its application in gas detection. Through the continuous efforts of many scholars, graphene gas-sensing materials have be...

Claims

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Application Information

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IPC IPC(8): G01N21/45G01N21/78
CPCG01N21/45G01N21/783
Inventor 迟虹宫廷媛李天铎
Owner QILU UNIV OF TECH
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