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        Stretchable graphene and carbon nanofiber capacitive touch sensors for robotic skin applications

        Srinivasarao Yaragalla,Simeone Dussoni,Muhammad Zahid,Marco Maggiali,Giorgio Metta,Athanassia Athanasiou,Ilker S. Bayer 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-

        Stretchable capacitive tactile sensors are crucial for the current and future soft robotic technology, particularlyfor designing artificial electronic skin for robots. In this study, we fabricated stretchable electronictactile sensors by spray coating of conductive graphene nanoplatelets (GNPs) or carbonnanofibers (CNFs) with liquid natural rubber (NR) binder over stretchable nitrile rubber (NBR) sheets. CNF-based coatings showed remarkably low sheet resistance of 30 X sq 1 and much better current transmissionpatterns under elongation, with ~50% current transmission reduction under 50% elongation,compared to GNP-based coatings with 600 X sq 1 resistance and ~99% current transmission reductionunder 50% elongation. Structural damages/cracks within the coatings due to repeated stretch-releasecycles could be healed by a rapid convective heat annealing process, restoring to initial current. Hapticsensing properties of the fabricated flexible capacitive device based on CNFs-coated nitrile rubber wereevaluated by connecting it to a printed circuit board (PCB). The device could easily sense tactile forcesfrom tens of mN to a few N, corresponding to (10 2–10) kPa pressure range over curvilinear surfacesor under elongation.

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