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Roberts, Akanksha and Chauhan, Neha and Islam, Saurav and Mahari, Subhasis and Ghawri, Bhaskar and Gandham, Ravi Kumar and Majumdar, S. S. and Ghosh, Arindam and Gandhi, Sonu (2020) Graphene functionalized field-effect transistors for ultrasensitive detection of Japanese encephalitis and Avian influenza virus. Scientific Reports, 10 (1). ISSN 2045-2322


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Graphene, a two-dimensional nanomaterial, has gained immense interest in biosensing applications due to its large surface-to-volume ratio, and excellent electrical properties. Herein, a compact and user-friendly graphene field effect transistor (GraFET) based ultrasensitive biosensor has been developed for detecting Japanese Encephalitis Virus (JEV) and Avian Influenza Virus (AIV). The novel sensing platform comprised of carboxy functionalized graphene on Si/SiO2 substrate for covalent immobilization of monoclonal antibodies of JEV and AIV. The bioconjugation and fabrication process of GraFET was characterized by various biophysical techniques such as Ultraviolet–Visible (UV–Vis), Raman, Fourier-Transform Infrared (FT-IR) spectroscopy, optical microscopy, Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). The change in the resistance due to antigen–antibody interaction was monitored in real time to evaluate the electrical response of the sensors. The sensors were tested in the range of 1 fM to 1 μM for both JEV and AIV antigens, and showed a limit of detection (LOD) upto 1 fM and 10 fM for JEV and AIV respectively under optimised conditions. Along with ease of fabrication, the GraFET devices were highly sensitive, specific, reproducible, and capable of detecting ultralow levels of JEV and AIV antigen. Moreover, these devices can be easily integrated into miniaturized FET-based real-time sensors for the rapid, cost-effective, and early Point of Care (PoC) diagnosis of JEV and AIV.

Item Type: Article
Subjects: Animal Genetics and Genomics
Infectious Diseases
Inflammation Biology
Reproductive Biology
Genetic Engineering
Depositing User: Mr Harjit Singh
Date Deposited: 22 Jun 2021 11:16
Last Modified: 22 Jun 2021 11:16
URI: http://niab.sciencecentral.in/id/eprint/97

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