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A flexible wearable piezoionic strain sensor based on the ionic polymer membrane sandwiched between two conductive electrodes is developed. This ionic polymer sensor can generate electrical signal output (\u2248mV) with rapid response (\u224850 ms) under the applied bending deformation due to the internal mobile ion redistribution. Compared with the currently studied resistive and capacitive sensors, this sensor can generate sensing signals without the requirement of additional power supply, and is able to distinguish the direction of the bending strain by observing the direction of generated electrical signals. For the sensor with metallic electrode, an output voltage of 1.3 mV is generated under a bending\u2010induced strain of 1.8%, and this voltage can be largely increased when replacing the metallic electrodes by graphene composites. After simple encapsulation of the piezoionic sensor, a wearable sensor is constructed and succeeded in monitoring the diverse human activities ranging from complex large scale multidimensional motions to subtle signals, including wrist bending with different directions, sitting posture sensing, pulse wave, and finger touch.<\/jats:p>","DOI":"10.1002\/smll.201600553","type":"journal-article","created":{"date-parts":[[2016,5,6]],"date-time":"2016-05-06T05:47:05Z","timestamp":1462513625000},"page":"5074-5080","source":"Crossref","is-referenced-by-count":166,"title":["Self\u2010Powered Piezoionic Strain Sensor toward the Monitoring of Human Activities"],"prefix":"10.1002","volume":"12","author":[{"given":"Yang","family":"Liu","sequence":"first","affiliation":[{"name":"i\u2010Lab, Suzhou Institute of Nano\u2010tech and Nano\u2010bionics Chinese Academy of Sciences  Suzhou 215123 P. R. 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