Detection of chemicals in water using a three-dimensional graphene porous structure as liquid-vapor separation filter
chemical detection, graphene structure, nanowire transistor, self-assembled monolayer, omniphobicity
ABSTRACT In this study, we report the utilization of a three-dimensional (3D) porous graphene structure as liquid–vapor separation filter, which allows the passage of chemical vapors while blocking liquid chemicals and water. The blockage of liquid chemicals and water from semiconducting sensing regions is required to avoid abnormal transistor characteristics. In order to impart omniphobic characteristics, a (heptadecafluoro-1,1,2,2-tetrahydrodecyl)trichlorosilane (HDF-S) self-assembled monolayer was coated on the surface of the 3D porous graphene structure. The concentration of chemical agents in water could be consistently detected by observing the shift in the threshold voltage in the oxide nanowire transistor covered by the HDF-S self-assembled 3D graphene structure. The proposed monitoring method is expected to offer means for application in different environments by providing a stable sensing performance.
Tsinghua University Press
Taekyung Lim,Jaejun Lee,Jonghun Lee,Sanghyun Ju, Detection of chemicals in water using a three-dimensional graphene porous structure as liquid-vapor separation filter. NanoRes.2017, 10(3): 971–979