TY - GEN
T1 - Using the quantum capacitance in graphene to enable varactors for passive wireless sensing applications
AU - Koester, Steven J.
PY - 2011/12/1
Y1 - 2011/12/1
N2 - A wireless sensor concept based upon the quantum capacitance effect in graphene is described. By utilizing thin gate dielectrics (EOT < 2 nm), the capacitance in a metal-insulator-graphene structure varies with charge concentration through the quantum capacitance effect. The high capacitance per unit area allows orders of magnitude improvement in scalability compared to MEMS-based sensors, while the high mobility in graphene allows high quality factors, Q, to be obtained. When operated away from the Dirac point, simulations using realistic structural and transport parameters predict capacitance tuning ratios of > 4 and Q values > 30 at 1 GHz. When operated at the Dirac point, the capacitance shows a strong temperature sensitivity, suggesting potential applications as a wireless temperature sensor.
AB - A wireless sensor concept based upon the quantum capacitance effect in graphene is described. By utilizing thin gate dielectrics (EOT < 2 nm), the capacitance in a metal-insulator-graphene structure varies with charge concentration through the quantum capacitance effect. The high capacitance per unit area allows orders of magnitude improvement in scalability compared to MEMS-based sensors, while the high mobility in graphene allows high quality factors, Q, to be obtained. When operated away from the Dirac point, simulations using realistic structural and transport parameters predict capacitance tuning ratios of > 4 and Q values > 30 at 1 GHz. When operated at the Dirac point, the capacitance shows a strong temperature sensitivity, suggesting potential applications as a wireless temperature sensor.
UR - http://www.scopus.com/inward/record.url?scp=84856935676&partnerID=8YFLogxK
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U2 - 10.1109/ICSENS.2011.6127214
DO - 10.1109/ICSENS.2011.6127214
M3 - Conference contribution
AN - SCOPUS:84856935676
SN - 9781424492886
T3 - Proceedings of IEEE Sensors
SP - 994
EP - 997
BT - IEEE Sensors 2011 Conference, SENSORS 2011
T2 - 10th IEEE SENSORS Conference 2011, SENSORS 2011
Y2 - 28 October 2011 through 31 October 2011
ER -