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November 9, 2018 | 1:00 p.m. - 2:30 p.m.
Category: Seminar
Location: College of Engineering #1200 | Map
5050 Anthony Wayne Dr.
Detroit, MI 48202
Cost: Free
Audience: Academic Staff, Alumni, Community, Current Graduate Students, Current Undergraduate Students, Faculty, Staff

Abstract: Passive wireless sensors are increasingly needed devices in the era of mobile health care and internet of things. Devices that can rely on little or no power can be easily added to other gadgets. Furthermore, passive wireless biological sensors are a step towards in-vivo sensing. During my PhD research, graphene quantum capacitance was utilized to engineer variable capacitor to the end goal of making passive wireless glucose sensors. Graphene is an attractive material for sensing applications due to its large surface-to-volume ratio and high electrical conductivity. The concentration-dependent density of states in graphene allows the capacitance in metal-oxide-graphene structures to be tunable with carrier concentration. This feature allows graphene to act as a variable capacitor (varactor). Capacitance tuning range of 1.6:1 was achieved at room-temperature with a back gated structure. A characterization methodology was developed to serve as a diagnostic process to ascertain graphene varactor limitations and capabilities.

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