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Journal of Sensors
Volume 2016 (2016), Article ID 4641398, 9 pages
Research Article

Graphene-Based FET Detector for E. coli K12 Real-Time Monitoring and Its Theoretical Analysis

1Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China
2Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong

Received 23 December 2015; Accepted 18 April 2016

Academic Editor: Kourosh Kalantar-Zadeh

Copyright © 2016 Jieyi Zhu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a theoretical analysis for a graphene-based FET real-time detector of the target bacteria E. coli K12. The motivation for this study is to design a sensor device for detection of bacteria in food and water in order to guarantee food safety. Graphene is chosen as our material for sensor design, which has outstanding electrical, physical, and optical performance. In our sensor structure, graphene-based solution gate field effect transistor (FET) is the device model; fabrication and functionalization protocol are presented together in this paper. What is more, a real-time signal display system is the accompanied equipment for our designed biosensor device. In this system, the sensor bias current signal would change obviously when the target bacteria are attached to the sensor surface. And the bias current increases when the E. coli concentration increases. In the latter part, a theoretical interpretation of the sensor signal is to explain the bias current increasing after the E. coli K12 attachment.