Design of an interdigitated microelectrode biosensor using a-SiC:H surface to capture E. coli

Jose Herrera-Celis, Claudia Reyes-Betanzo, Abdu Orduna-Diaz

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

This work proposes an interdigitated microelectrode biosensor (IMB), which includes hydrogenated amorphous silicon carbide (a-SiC:H) as surface to be functionalized. Accordingly, two a-SiC:H films are included, one on top of SiO2, and another on top of microelectrodes. The design along with the medium were simulated on CoventorWare® software, taking into account that the IMB proposed will be for the detection of Escherichia coli. The influence of both the a-SiC:H thin film and the capture of bacteria on electrodes on the impedance spectroscopy of the biosensor in the range of 10 kHz to 100 MHz was studied. The results show that the higher the conductivity of the thin film on microelectrodes, the lower is the increase of the magnitude of the impedance spectrum measured in presence of the sterile blank solution, and that the capture of bacteria on microelectrodes increases the sensitivity. The maximum percentage change in the magnitude of impedance of the PIMB is about 45 times greater than that of the conventional interdigitated microelectrode biosensor (CIMB).

Original languageEnglish
Title of host publicationSBMicro 2015 - 30th Symposium on Microelectronics Technology and Devices
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467371636
DOIs
StatePublished - 13 Oct 2015
Event30th Symposium on Microelectronics Technology and Devices, SBMicro 2015 - Salvador, Bahia, Brazil
Duration: 31 Aug 20154 Sep 2015

Publication series

NameSBMicro 2015 - 30th Symposium on Microelectronics Technology and Devices

Conference

Conference30th Symposium on Microelectronics Technology and Devices, SBMicro 2015
Country/TerritoryBrazil
CitySalvador, Bahia
Period31/08/154/09/15

Keywords

  • functionalization
  • hydrogenated amorphous silicon carbide
  • Impedance spectroscopy
  • interdigitated microelectrode biosensor

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