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论文类型：期刊论文

发表时间：2019-07-10

发表刊物：ACS APPLIED MATERIALS & INTERFACES

收录刊物：SCIE、PubMed

卷号：11

期号：27

页面范围：24639-24647

ISSN号：1944-8244

关键字：electronic skin; extreme stretchability; linear signal response; self-healing; mechanical adaptability

摘要：Artificial electronic skin (e-skin) that imitates the complex functions of human skin is able to transduce external stimuli into electronic signals. However, it remains challenging to fabricate e-skin sensing materials with extreme stretchability, self-healing, mechanical compliance, extreme temperature tolerance, and an ultrawide linear response range. Here, we demonstrate a new e-skin sensor fabricated by introducing polyvinylpyrrolidone (PVP)-capped Ag nanowires into the chemically and physically cross-linked polyacrylamide PVP double-network ethylene glycol organogel. The resulting organogel e-skin exhibits extreme stretchability (>22 000%), autonomous self healing, as well as mechanical compliance. Particularly, the sensor is capable of antifreezing and antiheating (-20 to 80 degrees C) and provides an ultrawide linear response range with a gauge factor of 0.15 for 0-430% tensile strain and 0.71 for 430-18 100% tensile strain, respectively. By dynamically accommodating to a curved surface, the e-skin sensor demonstrates comprehensive applications in real-time and in situ tracking of large body deformations, spatial gesture movements, behaviors and health level evaluation, showing great promise in wearable electronics, biomedical devices, and physiological signals for motion and soft robotics.