title: Transfer-Free Growth of Multilayer Graphene Using Self-Assembled Monolayers.
abstract: Large-area graphene needs to be directly synthesized on the desired substrates without using a transfer process so that it can easily be used in industrial applications. However, the development of a direct method for graphene growth on an arbitrary substrate remains challenging. Here, we demonstrate a bottom-up and transfer-free growth method for preparing multilayer graphene using a self-assembled monolayer (trimethoxy phenylsilane) as the carbon source. Graphene was directly grown on various substrates such as SiO2/Si, quartz, GaN, and textured Si by a simple thermal annealing process employing catalytic metal encapsulation. To determine the optimal growth conditions, experimental parameters such as the choice of catalytic metal, growth temperatures, and gas flow rate were investigated. The optical transmittance at 550 nm and the sheet resistance of the prepared transfer-free graphene are 84.3% and 3500 Ω/□, respectively. The synthesized graphene samples were fabricated into chemical sensors. High and fast responses to both NO2and NH3gas molecules were observed. The transfer-free graphene growth method proposed in this study is highly compatible with previously established fabrication systems, thereby opening up new possibilities for using graphene in versatile applications.
authors.affiliation: Department of Chemical and Biological Engineering, Korea University , Seoul 02841, South Korea.
authors.forename: Gwangseok
authors.initials: G
authors.lastname: Yang
authors.affiliation: Department of Chemical and Biological Engineering, Korea University , Seoul 02841, South Korea.
authors.forename: Hong-Yeol
authors.initials: HY
authors.lastname: Kim
authors.affiliation: Department of Chemical Engineering, Dankook University , Yongin 16890, South Korea.
authors.forename: Soohwan
authors.initials: S
authors.lastname: Jang
authors.affiliation: Department of Chemical and Biological Engineering, Korea University , Seoul 02841, South Korea.
authors.forename: Jihyun
authors.initials: J
authors.lastname: Kim
keywords: chemical sensor; graphene; multilayer; self-assembled monolayer; transfer-free