All-carbon suspended nanowire sensors as a rapid highly-sensitive label-free chemiresistive biosensing platform

Thiha, A. and Ibrahim, Fatimah and Muniandy, S. and Dishaw, I.J. and Teh, S.J. and Thong, Kwai Lin and Leo, B.F. and Madou, M. (2018) All-carbon suspended nanowire sensors as a rapid highly-sensitive label-free chemiresistive biosensing platform. Biosensors and Bioelectronics, 107. pp. 145-152. ISSN 0956-5663, DOI https://doi.org/10.1016/j.bios.2018.02.024.

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Abstract

Nanowire sensors offer great potential as highly sensitive electrochemical and electronic biosensors because of their small size, high aspect ratios, and electronic properties. Nevertheless, the available methods to fabricate carbon nanowires in a controlled manner remain limited to expensive techniques. This paper presents a simple fabrication technique for sub-100 nm suspended carbon nanowire sensors by integrating electrospinning and photolithography techniques. Carbon Microelectromechanical Systems (C-MEMS) fabrication techniques allow fabrication of high aspect ratio carbon structures by patterning photoresist polymers into desired shapes and subsequent carbonization of resultant structures by pyrolysis. In our sensor platform, suspended nanowires were deposited by electrospinning while photolithography was used to fabricate support structures. We have achieved suspended carbon nanowires with sub-100 nm diameters in this study. The sensor platform was then integrated with a microfluidic chip to form a lab-on-chip device for label-free chemiresistive biosensing. We have investigated this nanoelectronics label-free biosensor's performance towards bacterial sensing by functionalization with Salmonella-specific aptamer probes. The device was tested with varying concentrations of Salmonella Typhimurium to evaluate sensitivity and various other bacteria to investigate specificity. The results showed that the sensor is highly specific and sensitive in detection of Salmonella with a detection limit of 10 CFU mL−1. Moreover, this proposed chemiresistive assay has a reduced turnaround time of 5 min and sample volume requirement of 5 µL which are much less than reported in the literature.

Item Type:	Article
Funders:	Ministry of Science Technology and Innovation (MOSTI) Science Fund (SF-020-2014), Transdisciplinary Research Grant Scheme (TR002A-2014B), University of Malaya Flagship Grant (FL001A-14AET), Sultan Iskandar Johor Foundation: Special Equipment Grant
Uncontrolled Keywords:	Suspended carbon nanowire; Chemiresistive sensor; Label-free biosensing; Foodborne pathogen detection; Salmonella detection
Subjects:	Q Science > Q Science (General) Q Science > QC Physics Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Engineering Faculty of Medicine Faculty of Science > Institute of Biological Sciences
Depositing User:	Prof. Dr Kwai Lin Thong
Date Deposited:	02 Oct 2018 02:54
Last Modified:	15 Oct 2018 05:38
URI:	http://eprints.um.edu.my/id/eprint/18932

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