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

fYear

2015

fDate

21-25 June 2015

Firstpage

1381

Lastpage

1384

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS), 2015 Transducers - 2015 18th International Conference on

Conference_Location

Anchorage, AK

Type

conf

DOI

10.1109/TRANSDUCERS.2015.7181190

Filename

7181190