| Transparent conductive materials with excellent electrical and optical properties, are widely used in solar cells, liquid crystal displays, touch screens and other areas of optoelectronic devices. In these areas there are mainly exist in the form of transparent conductive films. Currently, the transparent conductive film is mainly prepared by a method of magnetron sputtering on a horniness substrate such as glass and silicon, which can not be bent and folded. The flexible electronics and flexible solar cells are the future direction of development of electronic products and new energy industries. Flexible solar cells are an effective program to solve the current solar frangible, heavy, difficult to install in a non-planar structure, which is nicely intergration with construction, vehicles and electrical appliances. However the current widespread use of conductive films is indium tin oxide (1TO) film. But indium resources are rare and the film equipment is expensive. ITO film can not be bent and folded, so development does not use rare resources flexible transparent film has a very important practical value.In this paper, the high aspect ratio Al-doped ZnO (referred to as AZO) nanowires and graphene composite were prepared. Transparent conductive films were prepared by using roll-to-roll process on a flexible PET substrate. The AZO nanowires and the nanocomposites were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), energy spectrum analysis (EDS), ultraviolet-visible light detector spectrophotometer (UV-Vis) and four-point probes for their morphology, structure and properties.The research mainly includes the following aspects:AZO nanomaterials were prepared respectively on a silicon, FTO conductive glass and slides glass substrates by hydrothermal method. The results showed that the material prepared on the silicon substrate has showed a good dimensional linear structure, AZO nanowires were grown vertically to the silicon substrate, with a good C-axis orientation. Its length is about0.5-1.5μm, diameter20-80nm, aspect ratio up to30-50, and when the amount of Al doping at5%and7%, which have a better morphology. Materials were prepared on the slide glass substrate, its morphology is a one-dimensional structure, and which is not the same by the doping amount of Al, the aspect ratio of AZO nanowires is about10. Materials were prepared on the FTO conductive glass substrate, its morphology is a uniform lamellar petaloid. XRD results indicated that materials have a hexagonal wurtzite phase and have a high crystallinity.AZO nanowires were prepared by low-temperature hydrothermal method in the presence of non-substrate, its morphology is a one-dimensional structure, which has an aspect ratio up to100, lines intersect to form a net structure. By changing process conditions, a sheet, nanospheres, petaloid shapes of the morphology of materials were prepared. AZO nanowires with a aspect ratio20has been prepared by thermal decomposition. The morphology of nanomaterials made of sheets is stacked AZO multi-level structure prepared by the sol-gel method, and sthdied the addition such as HMTA, PEG-400, and pH have the influence on hydrothermal preparation AZO nanostructures.Graphene was prepared by the reduction of graphene oxide, the graphene layer film was prepared on glass substrate by dip-coating method, and then AZO nanowires were synthesized by hydrothermal method. AZO/rGO composite were prepared by hydrothermal and the solvothermal methods, a variety of different morphologies have obtained. A single pulling time graphene composite prepared is better than pulling twice times, and AZO/rGO composite materials have a high transmission ratio compared with graphene. Four-point probes tests indicated that the resistance of composite which using a roll-to-roll process in the preparation of PET flexible substrate is104Ω, which compared with the resistance of the PET itself (1012Ω) has been reduced a lot, the transmittance is up to70%, with a preferable transmittance. |
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