期刊
ACS NANO
卷 8, 期 5, 页码 4689-4697出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn500441k
关键词
flexible electronic skin; tunneling piezoresistance; carbon nanotube composite; tactile sensor; human-health monitoring system
类别
资金
- National Research Foundation of Korea [NRF-2011-0014965, NRF-2012-K1A3A1A20031618]
- BK21 Plus Program [10Z20130011057]
- Korea Institute of Machinery & Materials (KIMM) [NK175B]
- Korea Institute of Science and Technology (KIST) [2E22112-11-249]
- National Research Council of Science & Technology (NST), Republic of Korea [NK175B] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2011-0014965, 22A20130000116] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The development of flexible electronic skins with high sensitivities and multimodal sensing capabilities is of great interest for applications ranging from human healthcare monitoring to robotic skins to prosthetic limbs. Although piezoresistive composite elastomers have shown great promise in this area of research, typically poor sensitivities and low response times, as well as signal drifts with temperature, have prevented further development of these materials in electronic skin applications. Here, we introduce and demonstrate a design of flexible electronic skins based on composite elastomer films that contain interlocked microdome arrays and display giant tunneling piezoresistance. Our design substantially increases the change in contact area upon loading and enables an extreme resistance-switching behavior (R-OFF/R-ON of similar to 10(5)). This translates into high sensitivity to pressure (-15.1 kPa(-1), similar to 0.2 Pa minimum detection) and rapid response/relaxation times (similar to 0.04 s), with a minimal dependence on temperature variation. We show that our sensors can sensitively monitor human breathing flows and voice vibrations, highlighting their potential use in wearable human-health monitoring systems.
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