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ACS Nano. 2014 Dec 23;8(12):12020-9. doi: 10.1021/nn505953t. Epub 2014 Nov 18.

Tactile-direction-sensitive and stretchable electronic skins based on human-skin-inspired interlocked microstructures.

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Department of Energy Engineering, School of Energy and Chemical Engineering, and ‡School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan Metropolitan City, 689-798, Republic of Korea.


Stretchable electronic skins with multidirectional force-sensing capabilities are of great importance in robotics, prosthetics, and rehabilitation devices. Inspired by the interlocked microstructures found in epidermal-dermal ridges in human skin, piezoresistive interlocked microdome arrays are employed for stress-direction-sensitive, stretchable electronic skins. Here we show that these arrays possess highly sensitive detection capability of various mechanical stimuli including normal, shear, stretching, bending, and twisting forces. Furthermore, the unique geometry of interlocked microdome arrays enables the differentiation of various mechanical stimuli because the arrays exhibit different levels of deformation depending on the direction of applied forces, thus providing different sensory output patterns. In addition, we show that the electronic skins attached on human skin in the arm and wrist areas are able to distinguish various mechanical stimuli applied in different directions and can selectively monitor different intensities and directions of air flows and vibrations.


directional sensor; human-skin-inspired device; stretchable electronic skin; tactile sensor

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