Printed-Circuit-Board-Based Two-Electrode System for Electronic Characterization of Proteins

Talebi, Sara and Daraghma, Souhad M.A. and Ramesh, Subramaniam and Bhassu, Subha and Gnana Kumar, Georgepeter and Periasamy, Vengadesh (2020) Printed-Circuit-Board-Based Two-Electrode System for Electronic Characterization of Proteins. ACS Omega, 5 (14). pp. 7802-7808. ISSN 2470-1343, DOI

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Proteins have been increasingly suggested as suitable candidates for the fabrication of biological computers and other biomolecular-based electronic devices mainly due to their interesting structure-related intrinsic electrical properties. These natural biopolymers are environmentally friendly substitutes for conventional inorganic materials and find numerous applications in bioelectronics. Effective manipulation of protein biomolecules allows for accurate fabrication of nanoscaled device dimensions for miniaturized electronics. The prerequisite, however, demands an interrogation of its various electronic properties prior to understanding the complex charge transfer mechanisms in protein molecules, the knowledge of which will be crucial toward development of such nanodevices. One significantly preferred method in recent times involves the utilization of solid-state sensors where interactions of proteins could be investigated upon contact with metals such as gold. Therefore, in this work, proteins (hemoglobin and collagen) were integrated within a two-electrode system, and the resulting electronic profiles were investigated. Interestingly, structure-related electronic profiles representing semiconductive-like behaviors were observed. These characteristic electronic profiles arise from the metal (Au)-semiconductor (protein) junction, clearly demonstrating the formation of a Schottky junction. Further interpretation of the electronic behavior of proteins was done by the calculation of selected solid-state parameters. For example, the turn-on voltage of hemoglobin was measured to occur at a lower turn-on voltage, indicating the possible influence of the hem group present as a cofactor in each subunit of this tetrameric protein. Copyright © 2020 American Chemical Society.

Item Type: Article
Funders: FRGS (FP038-2017A), PRGS (PR003-2019A) grants
Uncontrolled Keywords: Electron transfer; Electron transitions; Electronic coupling
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Q Science > QH Natural history
Divisions: Faculty of Science > Department of Physics
Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 16 Jun 2020 02:17
Last Modified: 16 Jun 2020 02:17

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