Electrically conducting rubber composites (CRC) with carbon nanotubes (CNTs) filler have received much attention as
potential materials for sensors. In this work, Ethylene propylene diene M-class rubber (EPDM)/CNT composites as a
novel nano sensory material were prepared to develop flexible strain sensors that can measure large deformation of
flexible structures. The EPDM/CNT composites were prepared by using a Brabender mixer with multi-walled CNTs and
organo-clay. A strain sensor made of EPDM/CNT composite was attached to the surface of a flexible beam and change
of resistance of the strain sensor was measured with respect to the beam deflection. Resistance of the sensor was change
quite linearly under the bending and compressive large beam deflection. Upon external forces, CRC deformation takes
place with the micro scale change of inter-electrical condition in rubber matrix due to the change of contact resistance,
and CRC reveals macro scale piezoresistivity. It is anticipated that the CNT/EPDM fibrous strain sensor can be eligible
to develop a biomimetic artificial neuron that can continuously sense deformation, pressure and shear force.
Electrical impedance properties of bulk carbon nanotube (CNT) composite electrodes have been studied to develop
chemical and biosensors. The CNTs embedded in composite electrodes were fabricated by means of traditional film
casting and electrospun nanoweb. The morphology of the bulk CNT electrode was investigated by scanning electron
microscopy (SEM) and transmission electron microscopy (TEM). Under the various amounts of buffer solution,
electrical impedance of the composite electrodes was measured by means of LCR meter. It is generally known that
electrical impedance measurement provides rapid and simple sensing mechanism. In this study, we found out that CNT
bulk composite electrodes showed good sensing properties for chemical and bio sensors.
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