Self-maintained colorimetric acid/base sensor using polypyrrole actuator

Ciarán Smyth, King Tong Lau, Roderick L. Shepherd, Dermot Diamond*, Yanzhe Wu, Geoffrey M. Spinks, Gordon G. Wallace

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


A novel approach to autonomous chemical sensor regeneration is explored in this paper. It involves the movement of a sensor surface into measurement or regeneration zones using low powered conducting polymer actuators. The system demonstrated the feasibility of repeatedly cycling through a measurement-regeneration regime, which in principle allows remotely deployed chemical sensors to perform simple self-diagnostics. The sensor-actuator device is shown to repeatedly switch through 120 measurement-regeneration cycles. Detection of pH-dependent colour changes is demonstrated using LED-based colorimetry and remotely deployed video cameras.

Original languageEnglish
Pages (from-to)518-524
Number of pages7
JournalSensors and Actuators, B: Chemical
Issue number2
Publication statusPublished - 22 Feb 2008
Externally publishedYes


  • Colorimetry
  • Optical sensing
  • Polymer actuator
  • Reflectance
  • Remote chemical sensor regeneration
  • Sensor networks

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