Fig. 4From: Polymer-based flexible and multi-directional tactile sensor with multiple NiCr piezoresistorsAs-fabricated polymer-based tactile sensor array. a Optical microscope images showing the top and bottom views of the sensor (scale bar: 100 μm). b Photograph of a pixelated 3 × 3 sensor array that can operate independently (scale bar: 2 mm)Back to article page