title: Piezoresistive Tactile Sensor Discriminating Multidirectional Forces.
abstract: Flexible tactile sensors capable of detecting the magnitude and direction of the applied force together are of great interest for application in human-interactive robots, prosthetics, and bionic arms/feet. Human skin contains excellent tactile sensing elements, mechanoreceptors, which detect their assigned tactile stimuli and transduce them into electrical signals. The transduced signals are transmitted through separated nerve fibers to the central nerve system without complicated signal processing. Inspired by the function and organization of human skin, we present a piezoresistive type tactile sensor capable of discriminating the direction and magnitude of stimulations without further signal processing. Our tactile sensor is based on a flexible core and four sidewall structures of elastomer, where highly sensitive interlocking piezoresistive type sensing elements are embedded. We demonstrate the discriminating normal pressure and shear force simultaneously without interference between the applied forces. The developed sensor can detect down to 128 Pa in normal pressure and 0.08 N in shear force, respectively. The developed sensor can be applied in the prosthetic arms requiring the restoration of tactile sensation to discriminate the feeling of normal and shear force like human skin.
authors.affiliation: Department of Nature-Inspired Nanoconvergence System, Korea Institute of Machinery and Materials, Daejeon 34103, Korea. yjung@kimm.re.kr.
authors.forename: Youngdo
authors.initials: Y
authors.lastname: Jung
authors.affiliation: Department of Nature-Inspired Nanoconvergence System, Korea Institute of Machinery and Materials, Daejeon 34103, Korea. educk9@kimm.re.kr.
authors.forename: Duck-Gyu
authors.initials: DG
authors.lastname: Lee
authors.affiliation: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea. myidx1212@unist.ac.kr.
authors.forename: Jonghwa
authors.initials: J
authors.lastname: Park
authors.affiliation: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea. hyunhko@unist.ac.kr.
authors.forename: Hyunhyub
authors.initials: H
authors.lastname: Ko
authors.affiliation: Department of Nature-Inspired Nanoconvergence System, Korea Institute of Machinery and Materials, Daejeon 34103, Korea. helim@kimm.re.kr.
authors.forename: Hyuneui
authors.initials: H
authors.lastname: Lim
mesh_terms: D004867:Equipment Design; D006801:Humans; D055595:Mechanical Phenomena; D037742:Nanotubes, Carbon / Q000737:chemistry; D018583:Pliability; D011312:Pressure; D012371:Robotics / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D012879:Skin Physiological Phenomena; D013314:Stress, Mechanical; D014110:Touch / Q000502:physiology*; D014159:Transducers
chemical_list: D037742:Nanotubes, Carbon
keywords: carbon nanotube; interlocking microdome; multidirectional detection; piezoresistive; shear force; tactile sensor