Patterning a nanowell sensor biochip for specific and rapid detection of bacteria Academic Article uri icon

abstract

  • This paper presents the fabrication process of a SEPTIC (SEnsing of Phage-Triggered Ion Cascades) chip, consisting of two Ti contact pads and a 150 nm wide Ti nanowell device on LiNbO 3 substrate. The patterning was fulfilled by combining electron beam lithography, contact photolithography and reactive ion etching. When connected to an external preamplifier and spectrum analyzer, the nanowell can probe nano-scale electric field fluctuations. The use of this chip as nano-scale electric field probe was demonstrated by detecting the transitory ion efflux from bacteria being infected by phage. Our experiment showed that the electric field noise follows 1/f 2 power spectrum when the bacteria are sensitive to the phage, whereas 1/f noise corresponds to bacteria resistant to the phage. The use of fluctuation-enhanced sensing can provide sensitivity orders of magnitude higher than conventional sensing that detects changes only in the mean value of electrical signals. © 2008.

altmetric score

  • 3

author list (cited authors)

  • Seo, S., Dobozi-King, M., Young, R. F., Kish, L. B., & Cheng, M.

citation count

  • 23

publication date

  • July 2008