Title :
Impedance spectroscopic analysis of Functionalized Graphene/silicon Schottky Diode sensor
Author :
Uddin, M.A. ; Singh, A.K. ; Daniels, K.M. ; Chandrashekhar, M.V.S. ; Koley, G.
Author_Institution :
Dept. of Electr. Eng., Univ. of South Carolina, Columbia, SC, USA
Abstract :
The sensor response of Functionalized Graphene chemiresistor and Graphene/p-Si Schottky Diode has been analyzed by DC amperometric measurement and AC impedance spectroscopy (IS) for the first time. The diode sensor exhibited more than one order higher sensitivity compared to the chemiresistor sensor for both pristine and functionalized condition. Considering only diode senor, Pt nanoparticle functionalization enhanced its performance by 4 times for NH3 exposure. To understand the diode sensing mechanism, the AC IS responses of both the sensors was analyzed using an equivalent circuit model, and the extracted equivalent circuit parameters at different conditions has been evaluated.
Keywords :
Schottky diodes; amperometric sensors; electric impedance measurement; elemental semiconductors; equivalent circuits; graphene; nanoparticles; nanosensors; platinum; silicon; AC impedance spectroscopy analysis; C-Si; DC amperometric measurement; IS; Pt; equivalent circuit model; functionalized graphene chemiresistor sensor; functionalized graphene-silicon Schottky diode sensor; nanoparticle functionalization enhancement; Equivalent circuits; Graphene; Impedance; Resistance; Schottky diodes; Sensors; Silicon; Gas Sensor; Graphene/Si; Impedance Spectroscopy; Metal Nanoparticle Functionalization; Schottky Diode Sensor;
Conference_Titel :
Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS), 2015 Transducers - 2015 18th International Conference on
Conference_Location :
Anchorage, AK
DOI :
10.1109/TRANSDUCERS.2015.7181190
