Publication date: 8th January 2019
Polydiacetylene (PDA) is a conducting polymer which is known to show changes in its colour when subjected to strain, i.e., mechanochromism [1]. However, its electromechanical behaviour under strain is not yet explored. Understanding the changes in conductivity with strain in PDA can help develop flexible and stretchable devices such as strain sensors and OLEDs. PDA is known to have auxetic structure at the molecular scale, which shows negative Poisson’s ratio under mechanical strain [2]. It would be interesting to explore the contributions of this molecular auxetic structure to the electromechanical behaviour and hence in strain sensing application. We study the electromechanical behaviour of PDA thin films and understand the contributing factors to the observed changes in conductivity under uniaxial tensile strain.
Some intrinsically conducting polymers and their composites show increase in conductivity during strain [3, 4], whereas metals and carbon-based materials and their composites show decrease in conductivity with strain. In our experiments, we observe that PDA thin films on PET substrate show increase in conductivity with strain, i.e., negative piezo-resistive behaviour. We propose a mechanism based on the possible contributions of auxetic structure to the negative piezo-resistive behaviour. Since PDA show changes in conductivity during strain, we study the strain sensing characteristics of PDA thin films. We propose a stretchable strain sensor based on PDA thin films on PET, with stretchability upto 100 % strain, strain sensitivity of 7 (at 1% strain) and dynamic durability upto 40 cycles.
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