Paper-based flexible sensors are
of great significance for promoting
the development of green wearable electronic devices due to their
good degradability and low cost. In this work, a paper-based wearable
pressure sensor with a sandwich structure is proposed, which is assembled
from a sensing layer printed with Ti3C2T
x
MXene ink, an interdigitated electrode printed
in the same simple and economical way, and two polyethylene terephthalate
films. The demonstrated paper-based pressure sensor exhibits excellent
sensitivity in a wide pressure sensing range, as well as cyclic stability
at a certain pressure. The sensor can be attached to the human body’s
surface to monitor various pressure-related physical activities. Using
a self-designed mobile phone APP, the special pressure signals collected
from the sensor can be transmitted and translated, and an intelligent
and encrypted information transmission system can be established.
Since only ordinary printing paper and Ti3C2T
x
MXene ink are used, the pressure sensor
is easy to prepare, economical, and environmentally friendly, and
it can be degraded by stirring in water without generating electronic
waste. It can be foreseen that the proposed sensor shows bright application
potential in the sustainable development of healthcare and human–computer
interaction fields.