Abstract
A highly mechanically flexible tactile device based on a metal–elastomer composite material was prepared by an efficient and simple process. The microcasting fabrication technique, used for the preparation of a selfstanding sheet of functional material, gives the possibility of easily fabricating complex-shaped structures suitable for integration on robot surfaces for tactile sensing applications. Under the action of a compressive stress the composite material exhibits a giant piezoresistive effect, varying its electrical resistance by several orders of magnitude. This phenomenon can be tuned by changing the material composition parameters, which directly modify the sensitivity of the sensor. After a comprehensive characterization of the functional properties of the material, an 8 × 8 pressure sensor matrix with dedicated electronics was fabricated and tested.
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