A powerless smart contact lens enabling to monitor intraocular pressure (IOP) by checking the visual color change in photonic crystal structure with a microhydraulic amplification system has been realized.
A direct label-free biosensor based on 3D photonic crystal structures for Rotavirus has been demonstrated. This proposed method will be useful for developing a direct and easy-to-use virus detection kit in the form of POCT in the near future.
Smart
contact lenses have the potential to serve as noninvasive
healthcare devices or virtual displays. However, their implementation
is limited by the lack of suitable power sources for microelectronic
devices. This Article demonstrates smart contact lenses with fully
embedded glucose fuel cells that are safe, flexible, and durable against
deformations. These fuel cells produced stable power throughout the
day or during intermittent use after storage for weeks. When the lenses
were exposed to 0.05 mM glucose solution, a steady-state maximum power
density of 4.4 μW/cm2 was achieved by optimizing
the chemistry and porous structure of the fuel cell components. Additionally,
even after bending the lenses in half 100 times, the fuel cell performance
was maintained without any mechanical failure. Lastly, when the fuel
cells were connected to electroresponsive hydrogel capacitors, we
could clearly distinguish between the tear glucose levels under normal
and diabetic conditions through the naked eye.
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