A general and facile method for preparation of large-scale reduced graphene oxide films with controlled structures

• Main Authors: Bi, Hengchang, Wan, Shu, Cao, Xiehong, Wu, Xing, Zhou, Yilong, Yin, Kuibo, Su, Shi, Ma, Qinglang, Sindoro, Melinda, Zhu, Jingfang, Zhang, Zhuoran, Zhang, Hua, Sun, Litao
• Other Authors: School of Materials Science and Engineering
• Format: Article
• Language: English
• Published: 2021
• Subjects: Engineering::Materials; Graphene Films; Heating-assisted Spraying
• Online Access: https://hdl.handle.net/10356/150627
• Institution: Nanyang Technological University

Graphene or reduced graphene oxide films (rGOFs) can be prepared by a number of methods including chemical vapor deposition (CVD), filtration, and spin-coating for a variety of applications. However, controlling their surface morphologies and microstructures to meet the requirements of specific applications is still a great challenge. Here, controlled microstructure of large-size rGOF with good electrical and thermal conductivities as well as high sorption ability is produced through a heating-assisted spray method. By simply tuning the heating temperature, the smooth surface and close-packed layered structure of rGOF can be changed to rough surface and porous structure. Impressively, the rapid preparation of rGOF with area as large as ∼216 cm2 in only 6 h has been successfully achieved, which is significant since normally it takes several days to prepare a rGOF with small area of ∼10 cm2 by using conventional filtration method. More importantly, our rGOFs show promising applications in oil sorption, supercapacitors, and thermally/electrically conductive films.