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Tuning the Magnitude and the Polarity of the Piezoresistive Response of Polyaniline through Structural Control

Tuning gague factor for polyaniline by sturctural manipulation

Mechanical deformations endured by flexible electronics can induce changes in the electrical resistance of their active electronic component. This effect is quantified by a unitless parameter called the gauge factor. If the conducting materials are instead used in thermo-/chemo-resistive sensors, changes in the resistance due to mechanical deformation must be negligible to prevent errors in sensor reading. The Loo Lab has shown tunability of both the polarity and the magnitude of the gauge factor of electrically conducting polyaniline by structural manipulation. This tunability gave us design rules that we leveraged in collaboration with Branko Glisic (CEE) to create polyaniline-based sensors with enhanced gauge factors for strain sensing applications, as well as those with near-zero gauge factors for flexible thermo-/chemo-resistive sensors to provide accurate measurements even when the sensors are bent or stretched.

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For more infomation about Professor Loo's research please see the Organic and Polymer Electronics Laboratory site.