1 research outputs found
Graphene Electronic Tattoo Sensors
Tattoo-like epidermal
sensors are an emerging class of truly wearable
electronics, owing to their thinness and softness. While most of them
are based on thin metal films, a silicon membrane, or nanoparticle-based
printable inks, we report sub-micrometer thick, multimodal electronic
tattoo sensors that are made of graphene. The graphene electronic
tattoo (GET) is designed as filamentary serpentines and fabricated
by a cost- and time-effective “wet transfer, dry patterning”
method. It has a total thickness of 463 ± 30 nm, an optical transparency
of ∼85%, and a stretchability of more than 40%. The GET can
be directly laminated on human skin just like a temporary tattoo and
can fully conform to the microscopic morphology of the surface of
skin <i>via</i> just van der Waals forces. The open-mesh
structure of the GET makes it breathable and its stiffness negligible.
A bare GET is able to stay attached to skin for several hours without
fracture or delamination. With liquid bandage coverage, a GET may
stay functional on the skin for up to several days. As a dry electrode,
GET–skin interface impedance is on par with medically used
silver/silver-chloride (Ag/AgCl) gel electrodes, while offering superior
comfort, mobility, and reliability. GET has been successfully applied
to measure electrocardiogram (ECG), electromyogram (EMG), electroencephalogram
(EEG), skin temperature, and skin hydration