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Carbon Nanotube‐Modified Fabric for Wearable Smart Electronic‐skin with Exclusive Normal‐Tangential Force Sensing Ability
Author(s) -
Song Yuanqiang,
Huang Wutong,
Mu Chunhong,
Chen Xiaoxi,
Zhang Qinghong,
Ran Ao,
Peng Ziru,
Sun Rujie,
Xie Weihua
Publication year - 2019
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201800680
Subject(s) - materials science , gauge factor , pressing , composite material , carbon nanotube , resistive touchscreen , polydimethylsiloxane , electronic skin , normal force , bending , bar (unit) , nanotechnology , fabrication , electrical engineering , mechanics , medicine , alternative medicine , physics , pathology , meteorology , engineering
Abstract It reports a fabric‐based flexible electronic skin (e‐skin) that differentiates normal pressure from tangential force with opposite resistance response. The e‐skin, which is based on multiwall carbon nanotubes (MWNTs) anchored on the fabric surface, is synthesized using a roll‐to‐roll method by dipping wrinkled fabric into a diluted MWNT/Polydimethylsiloxane dispersion. Normal pressing causes a decrease in resistance (gauge factor of −1.4 KPa −1 at 30–610 Pa), while tangential force leads to an increase in resistance (gauge factor of 1.13 N −1 under a pressure loading of 1 KPa), with good durability observed at over 5000 times of cyclic pressing and tangential force loading. The e‐skin is especially insensitive to both bending (<100°) and elongation deformation (<10%) due to the wrinkled surficial structure. For potential applications, the e‐skin can not only monitor wrist pulse, sense slight brush friction, but it can also work in a non‐contacting mode to detect human breath. Furthermore, because the e‐skin can produce opposite resistive responses to both pressure and friction, it can be applied to capture the complete force loading details during the process of picking up an object, which enables potential application for gentle grasping and manipulation of objects on artificial fingertips.