Flexible Strain Sensor Based on Printed LC Tank on Electrospun Piezoelectric Nanofibers

Nikbakhtnasrabadi, F. , Hosseini, E. S. and Dahiya, R. (2021) Flexible Strain Sensor Based on Printed LC Tank on Electrospun Piezoelectric Nanofibers. In: 2021 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS), 20-23 Jun 2021, ISBN 9781728191737 (doi: 10.1109/FLEPS51544.2021.9469866)

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his work presents a screen-printed LC resonant tank-based strain sensor. The resonant tank consists of a planar inductor and an interdigitated capacitor connected in parallel. The inductor was screen printed on flexible polyamide substrate and the capacitor is printed on the piezoelectric Poly-L-lactide (PLLA) nanofibers obtained by electrospinning. The resonant frequency of the tank is tuned for ~13.56 MHz. The inductors and capacitors were characterized using an impedance analyzer to evaluate the frequency characteristic of both. As the interdigitated capacitor is realized on a piezoelectric substrate the permittivity and hence the capacitance varies with the application of dynamic pressure. For the dynamic pressure, less than 2 kPa the sensitivity S 1 is 8.55 kPa -1 . The sensitivities in the range of 2-4 kPa -1 and 4-7 kPa -1 are calculated as S 2 = 31.27 kPa -1 and S 3 = 8.61 kPa -1 respectively. The fabricated flexible sensor shows the potential for wearable applications such as sub-bandage pressure monitoring while also exploiting the piezoelectric properties of PLLA to accelerate the wound healing through electrical stimulation.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Nikbakhtnasrabadi, Dr Fatemeh and Dahiya, Professor Ravinder
Authors: Nikbakhtnasrabadi, F., Hosseini, E. S., and Dahiya, R.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Published Online:05 July 2021

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
301728Engineering Fellowships for Growth: Printed Tactile SKINRavinder DahiyaEngineering and Physical Sciences Research Council (EPSRC)EP/R029644/1ENG - Electronics & Nanoscale Engineering