title: Transparent, flexible, all-reduced graphene oxide thin film transistors.
abstract: Owing to their unique thickness-dependent electronic properties, together with perfect flexibility and transparency, graphene and its relatives make fantastic material for use in both active channel and electrodes in various electronic devices. On the other hand, the electronic sensors based on graphene show high potential in detection of both chemical and biological species with high sensitivity. In this contribution, we report the fabrication of all-reduced graphene oxide (rGO) thin film transistors by a combination of solution-processed rGO electrodes with a micropatterned rGO channel, and then study their applications in biosensing. Our all-rGO devices are cost-effective, highly reproducible, and reliable. The fabricated electronic sensor is perfectly flexible with high transparency, showing good sensitivity in detecting proteins in the physiological buffer. As a proof of concept, fibronectin as low as 0.5 nM was successfully detected, which is comparable with the previously reported protein sensors based on single-layer pristine graphene obtained from mechanical cleavage. The specific detection of avidin by using biotinylated all-rGO sensor is also successfully demonstrated.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Qiyuan
authors.initials: Q
authors.lastname: He
authors.forename: Shixin
authors.initials: S
authors.lastname: Wu
authors.forename: Shuang
authors.initials: S
authors.lastname: Gao
authors.forename: Xiehong
authors.initials: X
authors.lastname: Cao
authors.forename: Zongyou
authors.initials: Z
authors.lastname: Yin
authors.forename: Hai
authors.initials: H
authors.lastname: Li
authors.forename: Peng
authors.initials: P
authors.lastname: Chen
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
mesh_terms: D001360:Avidin / Q000737:chemistry; D015374:Biosensing Techniques / Q000379:methods*; D019921:Biotinylation; D002021:Buffers; D004566:Electrodes; D004581:Electronics; D006108:Graphite / Q000737:chemistry*; D008422:Materials Testing; D036103:Nanotechnology / Q000379:methods; D010087:Oxides / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors; D014173:Transistors, Electronic
chemical_list: D002021:Buffers; D010087:Oxides; D001360:Avidin; D006108:Graphite