Single-Molecule Graphene Junction Aflatoxin Sensors: Chemo-Physical Insights from Ab Initio Simulations

The aflatoxin Bl (AFBl) is a cancerogenic compound affecting the agri-food chain, endangering food safety and public health. Worldwide regulatory agencies establish strict limitations for the presence of AFB 1 in crops. Current detection methods require bulky equipment, long measurement time, and sk...

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Bibliographic Details
Main Authors: Mo, Fabrizio, Ala, Walter, Spano, Chiara Elfi, Piccinini, Gianluca, Graziano, Mariagrazia, Ardesi, Yuri
Format: Conference Proceeding
Language:English
Subjects:
Current measurement
Electronic noses
Graphene
Safety
Scattering
Time measurement
Velocity measurement
Online Access:Request full text
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Summary:The aflatoxin Bl (AFBl) is a cancerogenic compound affecting the agri-food chain, endangering food safety and public health. Worldwide regulatory agencies establish strict limitations for the presence of AFB 1 in crops. Current detection methods require bulky equipment, long measurement time, and skilled laboratory researchers, which make it challenging to measure the AFB 1 in the whole food chain pervasively. In this field, molecular junctions represent an exciting alternative in the sensing application, providing a highly integrable device for the fast measurement of chemical compounds. Through ab initio simulation, this work investigates graphene junctions for detecting AFBI. The results show that applying a bias voltage of 1.2 V to a graphene layer permits varying the electrical current of the junction by more than 3\mu \mathrm{A} when the AFBI is present. The obtained results motivate research on the integrability of the device in more complex sensing systems such as intelligent sensors and electronic noses.
ISSN:1944-9380
DOI:10.1109/NANO61778.2024.10628920