Graphene, with its high conductivity, high transparency, high flexibility, high barrier, high mechanical strength, high chemical stability and ultra-thin properties, is regarded as the most subversive material-"king of new materials" in the 21st century and has attracted worldwide attention. It is expected to be widely used in many fields, like electronics, photons, energy, environmental protection, bio-medical health, etc. At present, many countries, like Europe, the United States and Japan, have made graphene on their lists as the most important new material to be studied and developed in this century. And important progress and preliminary application have been made in new energy, electronics and other aspects. China has also explicitly enlisted graphene as an essential strategic material in the national "13th Five-Year plan". Graphene is divided into two categories: graphene powder (reduced graphene oxide) and graphene film. Currently, graphene powder is the main research object. The preparation and application of graphene powder have been systematically studied, and some achievements have been achieved. But for graphene films, many studies are done on preparation technologies. As for its application, although preliminary application researches have been carried out in various fields, which verify the feasibility of applying graphene films and meet the expectation of creating significant advantages in its partial application, most of them are in the preliminary stage and face with lots of technical challenges. That is related to the fact that there is a huge gap between the practical performance and the theoretical performance of the graphene films. So, preparation technologies should be improved to optimize the performance of graphene films, on the other hand, considering the characteristics of graphene, the application of graphene films with apparent merits should be chosen for further studies and the design of products made from graphene films so as to open the application market of graphene films indeed. Firstly, the research status and trend of development of graphene films prepared by chemical vapor deposition is introduced in this thesis: the grain domain size of graphene films is mainly in micron- millimeter scale, even some research institutes in centimeter level; and mobility of graphene films reaches 10 000-30 000 cm2/(V•s); the square resistance of graphene films is <150 Ω/□, and the transmittance of graphene films is 97.7%. The trend of development is to develop technologies so as to controllably and rapidly produce in situ deposition graphene films in large area, large grain domain size and high quality and to find application scenarios where the excellent properties of graphene films are reflected. Secondly, under the framework of the European Union's "Graphene Flagship Program" technology roadmap, according to several characteristics of graphene films and considering technological advancement, future market scale, feasibility and development cycle,sixteen main application directions are selected as the focus. And they are classified into seven categories: transparent conductive layers, separation and isolation membranes, field effect transistors (channel layer), photodetectors (active region), thermal conductive materials, current collector coatings, catalyst carriers. The advantages, current situation and problems caused by the application of graphene films in these fields are mainly introduced to provide the basis research for the development of grapheme films. © 2020, Materials Review Magazine. All right reserved.
