Preparation of graphene-based flexible transparent conductive films

• Main Authors: Li-Wen Tien, 田力文
• Other Authors: Chun-Hu Chen
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/88565302086104065444

碩士 === 國立中山大學 === 化學系研究所 === 104 === The transparent flexible conductive film is a very important screen electrode material, widely used in display devices, touch panels, smart windows, and other optoelectronic devices. The market widely use indium tin oxide (ITO) to be transparent conductive film currently, but it has many drawbacks. ITO is mechanically brittle and a poor substrate for adhesion of organic and polymeric materials. Graphene has a unique two-dimensional structure, ultra-thin thickness, and good electrical properties, ideal material for transparent conductive films. In our study, graphene thin film using graphene oxide (GO) colloidal was prepared by the spin coating, but in general the films can be thick easily with poor transparency. So we use chemically modified GO to control thickness and film-forming property. In addition, spin coating poly (methylmethacrylate)-assistance allow us placing graphene oxide thin film on variety of substrates. We tried different approaches of hydrothermal, photocatalytic reduction, or reducing reaction to produce reduce graphene oxide film. The lowest sheet resistance of the graphene oxide results is 3~4 kΩ/sq with transmittance of 85%. And then we mix graphene oxide with other conducting material (Ag, ferrocene, polypyrrole, PEDOT:PSS) to achieve a higher transmittance and lower sheet resistance film. In addition, we make a PEDOT and reduce graphene oxide composite film achieving sheet resistance of 25 Ω/sq and transmittance is more than 80%. These film show stability higher than PEDOT film.