Doctoral Thesis: Graphene Chemical and Biological Sensors: Modeling, Systems, and Application

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Event Speaker: 

Charles Mackin

Event Location: 

3-133

Event Date/Time: 

Thursday, May 17, 2018 - 1:00pm

Abstract: 
 
This thesis builds new graphene chemical and biological sensing technologies from the ground up by developing device models, systems, and applications.  On the modeling side, this thesis develops a DC model for graphene electrolyte-gated field-effect transistors (EGFETs).  It also presents a novel frequency-dependent (AC) small-signal model for graphene EGFETs and demonstrates the ability of these devices to operate as functional amplifiers for the first time.  
 
Graphene sensors are transitioned to the system-level by developing a new sensor array architecture in conjunction with a compact and easy-to-use custom data acquisition system.  The system allows for simultaneous characterization of hundreds of sensors and provides insight into graphene EGFET performance variations.  The system is adapted to develop solution-phase ionized calcium sensors that have been functionalized using a polyvinyl chloride (PVC) membrane containing a neutral calcium ionophore.  Finally, the sensor system is employed to develop gas-phase chemiresistive ammonia sensors that have been functionalized using cobalt porphyrin.
 
Thesis Supervisor: Prof. Tomás Palacios