title: Fabrication of graphene-based flexible devices utilizing a soft lithographic patterning method.
abstract: There has been considerable interest in soft lithographic patterning processing of large scale graphene sheets due to the low cost and simplicity of the patterning process along with the exceptional electrical or physical properties of graphene. These properties include an extremely high carrier mobility and excellent mechanical strength. Recently, a study has reported that single layer graphene grown via chemical vapor deposition (CVD) was patterned and transferred to a target surface by controlling the surface energy of the polydimethylsiloxane (PDMS) stamp. However, applications are limited because of the challenge of CVD-graphene functionalization for devices such as chemical or bio-sensors. In addition, graphene-based layers patterned with a micron scale width on the surface of biocompatible silk fibroin thin films, which are not suitable for conventional CMOS processes such as the patterning or etching of substrates, have yet to be reported. Herein, we developed a soft lithographic patterning process via surface energy modification for advanced graphene-based flexible devices such as transistors or chemical sensors. Using this approach, the surface of a relief-patterned elastomeric stamp was functionalized with hydrophilic dimethylsulfoxide molecules to enhance the surface energy of the stamp and to remove the graphene-based layer from the initial substrate and transfer it to a target surface. As a proof of concept using this soft lithographic patterning technique, we demonstrated a simple and efficient chemical sensor consisting of reduced graphene oxide and a metallic nanoparticle composite. A flexible graphene-based device on a biocompatible silk fibroin substrate, which is attachable to an arbitrary target surface, was also successfully fabricated. Briefly, a soft lithographic patterning process via surface energy modification was developed for advanced graphene-based flexible devices such as transistors or chemical sensors and attachable devices on a biocompatible silk fibroin substrate. Significantly, this soft lithographic patterning technique enables us to demonstrate a simple and efficient chemical sensor based on reduced graphene oxide (rGO), a metallic nanoparticle composite, and an attachable graphene-based device on a silk fibroin thin film.
authors: Thin Film Materials Research Group, Korea Research Institute of Chemical Technology, Daejeon 305-543, Republic of Korea. Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
authors: Min Wook
authors: MW
authors: Jung
authors: Sung
authors: S
authors: Myung
authors: Ki Woong
authors: KW
authors: Kim
authors: Wooseok
authors: W
authors: Song
authors: You-Young
authors: YY
authors: Jo
authors: Sun Suk
authors: SS
authors: Lee
authors: Jongsun
authors: J
authors: Lim
authors: Chong-Yun
authors: CY
authors: Park
authors: Ki-Seok
authors: KS
authors: An
mesh_terms: D015374:Biosensing Techniques / Q000379:methods; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D005349:Fibroins / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D010087:Oxides / Q000737:chemistry; D047011:Silk / Q000737:chemistry; D013499:Surface Properties
chemical_list: D004129:Dimethylpolysiloxanes; D010087:Oxides; D047011:Silk; C013830:baysilon; D006108:Graphite; D005349:Fibroins