Title :
Graphene-based FET structure: Modeling FET characteristics for an aptamer-based analyte sensor
Author :
Xu, Ke ; Qian, Jun ; Shukla, Pitamber ; Dutta, Mitra ; Stroscio, Michael A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Illinois at Chicago, Chicago, IL, USA
Abstract :
Graphene is a very promising electronic material that has attracted vast research interests due to its unique electronic properties [1]. In this paper, a graphene-based FET-like aptamer sensor is modelled for the case of an aptamer that binds to a cocaine surrogate. Methylene-blue (MB) is a nanoscale molecule that functions as an electron donor. The graphene in these structures exhibits p-type semiconductor behavior with holes as carriers. The voltage shift caused by electron trapping on the graphene surface is observed and explained by a charge sheet capacitance model. In this work, the graphene-based FET characteristics are modelled to understand the use of this device as a sensor of molecular analytes.
Keywords :
chemical sensors; field effect transistors; graphene; semiconductor device models; C; FET characteristic modeling; charge sheet capacitance model; electron donor; electron trapping; electronic material; electronic properties; graphene surface; graphene-based FET-like aptamer sensor; methylene-blue; molecular analytes; p-type semiconductor; Analytical models; Capacitance; Electron traps; FETs; Materials; Semiconductor device modeling;
Conference_Titel :
Computational Electronics (IWCE), 2012 15th International Workshop on
Conference_Location :
Madison, WI
Print_ISBN :
978-1-4673-0705-5
DOI :
10.1109/IWCE.2012.6242868
