Preparation methods of flexible substrate-based graphene film and flexible substrate-based graphene composite film

Abstract

The invention discloses a preparation method of a flexible substrate-based graphene film. The preparation method comprises the following steps of coating a graphene oxide aqueous solution on a paper base material to obtain a uniform graphene oxide film, carrying out drying curing treatment, coating a polydimethylsiloxane (PDMS) layer on the surface of the graphene oxide film, carrying out curing treatment, and dipping the treated paper base material into hydroiodic acid for a reduction reaction, wherein in the reduction reaction, the treated paper base material undergoes a hydrolysis reaction under the acid conditions and simultaneously, reacts with the acid to produce bubbles so that the graphene oxide film is automatically separated from the paper base material and the flexible substrate-based graphene film product is obtained. The invention also discloses a preparation method of a flexible substrate-based graphene composite film. The methods realize graphene reduction without a high temperature condition or a toxic reduction reagent, conveniently and fast realize film stripping and transfer and are especially suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of graphene preparation, and more specifically relates to a method for preparing graphene based on a flexible substrate and a composite film thereof. Background technique [0002] In recent years, with the rapid increase in demand for consumer electronics, flexible, lightweight and portable electronic devices (such as rollable displays, wearable electronics, etc.) have become a research hotspot. Flexible electronics have great application prospects in wearable display elements, artificial skin, and distributed sensors. Graphene is a honeycomb-like two-dimensional lattice structure carbon nanomaterial with carbon atoms tightly packed in sp2 hybrid system. Low cost and other characteristics are expected to be widely used in flexible electronics, energy storage, electrochemical sensing and other fields. [0003] In these applications, graphene usually needs to be used in thin film form and transferred to flex...

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Problems solved by technology

At present, the methods used to prepare graphene films mainly include spin coating, spray coating, suction filtration, and chemical vapor deposition (CVD), among which spin coating is a commonly used operation method in laboratories, and can only prepare small-area graphene films. Graphene film, and the thickness distribution of the prepared film is uneven, and the requirements for the solution are relatively strict; the spraying method has complicated operation steps and relatively high preparation costs, which is not conducive to large-scale industrial production; the suction filtration method also faces the time of suction filtration. The length and film area are limited by the device, and it is difficult to prepare a large area; for the chemical vapor deposition method, although a large-area graphene film can be synthesized, a metal catalyst layer must be used to synthesize a graphene film on a metal catalyst substrate. The synthesis temperature Generally, it is above 650. In actual operation, the large-area graphene film synthesized on the metal substrate must be transferred to a flexible substrate, which causes inconvenience in actual production.

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