First-Principles Modeling for DNA Bases via Z-shaped Graphene Nanoribbon with a Nanogap

Asma Wasfi, Falah Awwad

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


DNA sequencing is a significant technique to detect genetic illnesses and various diseases. Quick, accurate, and low cost DNA sequencing approach would revolutionize medicine. In this paper, a two-terminal z-shaped sensor with a nanogap is designed and studied to detect the DNA sequence. The z-shaped sensor is made of two metallic zigzag graphene nanoribbon (ZGNR), a semiconducting channel made of armchair graphene nanoribbon (AGNR), and a nanogap in the middle of the channel whose edge carbon atoms are passivated by either hydrogen or nitrogen. Placing a DNA base into the nanogap impacts the charge density of the sensor leading to unique signature for each of the four DNA bases. The z-shaped sensor performance was studied by non-equilibrium Green's function combined with density functional theory (NEGF+DFT). The transverse current and the transmission spectrum of the DNA bases within the nanogap are investigated with variation in the base orientation. The proposed sensor is highly useful for real application of quick, low-cost, and accurate DNA detection.

Original languageEnglish
Title of host publication2019 IEEE Sensors, SENSORS 2019 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728116341
Publication statusPublished - Oct 2019
Event18th IEEE Sensors, SENSORS 2019 - Montreal, Canada
Duration: Oct 27 2019Oct 30 2019

Publication series

NameProceedings of IEEE Sensors
ISSN (Print)1930-0395
ISSN (Electronic)2168-9229


Conference18th IEEE Sensors, SENSORS 2019


  • DNA sequencing
  • density functional theory
  • electronic transport
  • graphene nanoribbon
  • nanogap

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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