Biosensing platform on a flexible substrate

Sahil Shah, Joseph Smith, John Stowell, Jennifer Blain Christen

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The work presents implementing a low cost pH sensing system for biological applications in a flexible electronics process. As a part of the system the work describes an ion sensitive field effect transistor, using indium tin oxide (ITO) as a sensing layer and gold as a reference electrode, on a flexible substrate. The devices presented here are designed and fabricated using the thin film transistor (TFT) display technology at the Arizona State University Flexible Electronics and Display Center. It was observed that ITO has a sensitivity of 50 mV/pH. The work also discusses the variability in these devices and signal processing that could be used to calibrate them. Toward this end, a readout circuit designed in a 0.5 μm CMOS process is presented to interface with the sensors.

Original languageEnglish (US)
Pages (from-to)197-203
Number of pages7
JournalSensors and Actuators, B: Chemical
StatePublished - Apr 2015


  • CMOS
  • ITO
  • Microfluidic
  • PEN

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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