Flexible pressure sensors made of
carbon materials have been used
in electronic skins (e-skins), whose performance can be enhanced if
composite sensing materials are used. Herein, an MXene/polyaniline/bacterial
cellulose (MXene/PANI/BC) aerogel sensor has been fabricated through
the self-assembly process between the MXene and one-dimensional active
material. Combined with fewer-layer or single-layer MXenes, the as-fabricated
aerogel could be used as the active layer of the pressure sensor,
monitoring tiny motion signals of finger bending, wrist bending, and
pulse beating. Bluetooth wireless transmission could also be realized
to monitor the real-time spatial pressure distributions on the mobile
phone, making the aerogel-based sensor an ideal candidate in e-skins.
Meanwhile, the aerogel-based sensor is sensitive toward NH3 due to the unique three-dimensional (3D) structure of the aerogel
and the abundant terminal groups (such as −O, −OH, and
−F) of the MXene in the system that ensure efficient electronic
transfer for the sensing process and create active sites for the absorption
with the target gas. This work offers a versatile platform to develop
MXenes to fabricate 3D composite aerogels for high-performance flexible
multiple sensors.
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