Electronic skins, often with recognition
and sensing capabilities
that are beyond those associated with biological skin, provide important
medical information for human health. However, how to make electronic
skins with both tactile and touchless perceptions for applications
in real-time health monitoring is a challenge due to biological complexity.
Herein, flexible bimodal e-skins are demonstrated using a lamellated
MXene/chitosan film as the kernel sensing layer. These biomimetic
hybrid films show excellent biocompatibility in a cytotoxicity test,
indicating a reduced risk of application in the human body. The flexible
devices display two modes that can detect pressure (with a limit of
detection (LoD) of 3 Pa, stability >3500 times, and response time
of 143 ms) and humidity (stability >20 days). The bifunctional
sensor
can also be used in detecting and discriminating electrophysiological
signals (including voice recognition, human pulses, and finger bending)
and biochemical molecules (respiratory rate). This work may lead to
the application of biocomposite materials in multifunctional flexible
sensing technology.
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