Self-maintained colorimetric acid/base sensor using polypyrrole actuator



Publication Details

Smyth, C., Lau, K., Shepherd, R. L., Diamond, D., Wu, Y., Spinks, G. Maxwell. & Wallace, G. G. (2008). Self-maintained colorimetric acid/base sensor using polypyrrole actuator. Sensors and Actuators B: Chemical: international journal devoted to research and development of physical and chemical transducers, 129 518-524.


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.

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