Abstract
A simple method based on solution casting on a template is presented which allows one to create rough conductive elastomer surfaces incorporating carbon nanotubes. The electrical contact mechanism between the rough elastomer and a hard and smooth conductor is studied in detail with the aim of understanding its increased force sensitivity compared to a flat conductive elastomer surface. For the samples investigated here, the contact area increases in a nonlinear fashion before it saturates at large applied forces, while the electrical resistance decreases nonlinearly with force before saturating. The resistance is found to decrease inversely proportional to the contact area, and changes highly nonlinearly with applied force even in a relatively small dynamic range, which is attributed to the nonlinear dependence of contact area on force. The conductive elastomer can be mounted on a flat or a curved surface, such as a glove, to function as a force-sensitive resistor.
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