Electronic Detection of Escherichia coli O157︰H7 Using Single-Walled Carbon Nanotubes Field-Effect Transistor Biosensor

DOI: 10.4236/eng.2012.410B024   PDF   HTML     3,110 Downloads   4,512 Views   Citations


Field effect transistors (FET) based on Single-Walled Carbon Nanotubes (SWNTs) become the hot topic in fields of nano-electronic, clinical diagnostics, environmental testing etc. in recent years. In this paper, we reported a simple, scalable way to enrich semiconducting SWNTs by using HNO3/H2SO4. Then carbon nanotube field-effect transistors (CNTFET) biosensor was fabricated with the enrichment SWNTs for Escherichia coli O157H7 detection. The response of each CNTFET was monitored in real time before and after introduction of the Escherichia coli O157H7 at various concentrations. The results show that CNT-FET biosensors we fabricated are sensitive to change of concentration of solution and response time is really short.

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X. Zhang, D. Wang, D. Yang, S. Li and Z. Shen, "Electronic Detection of Escherichia coli O157︰H7 Using Single-Walled Carbon Nanotubes Field-Effect Transistor Biosensor," Engineering, Vol. 4 No. 10B, 2012, pp. 94-98. doi: 10.4236/eng.2012.410B024.

Conflicts of Interest

The authors declare no conflicts of interest.


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