title: A solid dielectric gated graphene nanosensor in electrolyte solutions.
abstract: This letter presents a graphene field effect transistor (GFET) nanosensor that, with a solid gate provided by a high-κdielectric, allows analyte detection in liquid media at low gate voltages. The gate is embedded within the sensor and thus is isolated from a sample solution, offering a high level of integration and miniaturization and eliminating errors caused by the liquid disturbance, desirable for bothin vitroandin vivoapplications. We demonstrate that the GFET nanosensor can be used to measure pH changes in a range of 5.3-9.3. Based on the experimental observations and quantitative analysis, the charging of an electrical double layer capacitor is found to be the major mechanism of pH sensing.
authors.affiliation: Department of Mechanical Engineering, Columbia University , New York, New York 10027, USA.
authors.forename: Yibo
authors.initials: Y
authors.lastname: Zhu
authors.forename: Cheng
authors.initials: C
authors.lastname: Wang
authors.affiliation: Department of Mechanical Engineering, Columbia University , New York, New York 10027, USA.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Petrone
authors.affiliation: Department of Chemistry, Columbia University , New York, New York 10027, USA.
authors.forename: Jaeeun
authors.initials: J
authors.lastname: Yu
authors.affiliation: Department of Chemistry, Columbia University , New York, New York 10027, USA.
authors.forename: Colin
authors.initials: C
authors.lastname: Nuckolls
authors.affiliation: Department of Mechanical Engineering, Columbia University , New York, New York 10027, USA.
authors.forename: James
authors.initials: J
authors.lastname: Hone
authors.affiliation: Department of Mechanical Engineering, Columbia University , New York, New York 10027, USA.
authors.forename: Qiao
authors.initials: Q
authors.lastname: Lin