To date, ionogel
sensors have aroused the extensive interest as
an alternative to hydrogel sensors, as they are promising materials
to solve the problems of easy drying and easy freezing. However, the
weak mechanical properties of ionogels have seriously hindered their
large-scale application. Herein, a robust physically linked double-network
ionogel (DN ionogel) was fabricated via interpenetrating a poly(hydroxyethyl
acrylate) network into an agarose network in 1-ethyl-3-methylimidazolium
chloride. The DN ionogel possessed good mechanical properties, high
transparency, extreme temperature tolerance, and excellent self-adhesion.
The superior electromechanical properties render the DN ionogel as
a perfect candidate to be utilized as a strain sensor to monitor various
human activities. In addition, the DN ionogel exhibited reasonably
high sensitivity to temperature. Therefore, it is believed that this
high performance strain–temperature bimodal sensor offers a
promising prospect in flexible intelligent electronics.
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