PET-graphene-AgNW (polyethylene terephthalate-graphene-Ag nanowire) composite transparent conducting film and preparation method thereof

Abstract

The invention provides a preparation method of a PET-graphene-AgNW (polyethylene terephthalate-graphene-Ag nanowire) composite transparent conducting film. The preparation method comprises steps as follows: cutting and cleaning of a graphene substrate, preparation of an AgNW solution, vacuum filtration of an AgNW film, preforming, removing of a filter film and nitrogen blow-drying. The invention further provides the PET-graphene-AgNW composite transparent conducting film prepared with the method. According to the preparation method, the AgNWs and graphene are subjected to film forming independently and then are composited together, wherein AgNW film forming adopts vacuum filtration, and graphene adopts CVD (chemical vapor deposition) growth, so that the prepared composite film has the advantages of uniformly dispersed AgNWs, controllable thickness, good mechanical flexibility, low square resistance, high optical transmittance and lower surface roughness and can meet the requirement of device applications; according to the composite transparent film, the lower square resistance and the higher optical transmittance can be realized only through composition of a few AgNWs, and the square resistance of the PET-graphene-AgNW composite transparent conducting film is lower than that of a pure silver AgNW film under the same concentration by 20%-40%.

Description

technical field [0001] The invention relates to the technical field of flexible transparent conductive films, in particular to a PET-graphene-silver nanowire (PET-Graphene-AgNWs) composite transparent conductive film and a preparation method thereof. Background technique [0002] Transparent electrodes are mainly used in microelectronics and optoelectronics fields such as flat-panel displays, organic electroluminescent devices (OLEDs), solar cells, touch panels, transparent transistors, etc., which require both high light transmittance and current input / output characteristics. The main requirements of transparent electrodes are: high light transmittance in the visible light band (generally requires transmittance greater than 80%), low sheet resistance (generally required to be less than 100Ω / □), low surface roughness and Stable mechanical and chemical properties, etc. In recent years, with the development of microelectronics and optoelectronic devices towards flexibility an...

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Problems solved by technology

[0006] Aiming at the technical problems that the uniformity of the film prepared by the existing preparation method is not good, and the utilization rate of the material is not high, the present invention provides a method for preparing a composite film of graphene and silver nanowires based on the principle of vacuum filtration. The method adopts chemical Graphene grown by chemical vapor deposition (Chemical VaporDeposition, referred to as CVD) is used as the substrate of composite materials. Under the condition of solid-phase graphene with high electron mobility, only a small amount of silver nanowires can achieve low sheet resistance and high The light transmittance, and finally a PET-Graphene-AgNWs composite transparent conductive film

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