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Proposal of an Embedded Nanogap Biosensor by a Graphene Nanoribbon Field‐Effect Transistor for Biological Samples Detection
Author(s) -
Anvarifard Mohammad K.,
Ramezani Zeinab,
Amiri Iraj Sadegh
Publication year - 2020
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201900879
Subject(s) - biosensor , graphene , materials science , streptavidin , transistor , nanotechnology , field effect transistor , dielectric , optoelectronics , biasing , sensitivity (control systems) , voltage , electronic engineering , chemistry , biotin , electrical engineering , biochemistry , engineering
Herein, it is examined how a graphene nanoribbon field‐effect transistor (GNRFET) can be a useful nanoscale device, along with how to use an embedded nanogap inside a top gate oxide to form a biosensor. A streptavidin–biotin binding system with the dielectric constant of 2.1 is considered as a biological test sample for detection. Introducing the biological sample to the nanogap without a buffer solution modifies the electrostatic modulation in the graphene sheet, resulting in a change in the drain current. The order of change in the drain current is considered a criterion to measure the sensitivity of the proposed biosensor. A detailed investigation and discussion of the biasing conditions during the detection process reveal the optimal bias for the proposed biosensor to achieve a greater sensitivity, all while maintaining a desirable electrical performance.