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Zheng Yan, an assistant professor in the College of Engineering, said many existing commercial on-skin biomedical devices often contain two major components—a biomedical tracking component and a surrounding flexible material, such as plastic, to provide a supportive structure for the component to maintain an on-skin connection with a person's body.

Since its invention, pencils—made of lead including various levels of graphite, clay and wax—have often been used for writing and drawing. In the study, the researchers discovered that pencils containing more than 90% graphite are able to conduct a high amount of energy created from the friction between paper and pencil caused by drawing or writing. Specifically, the researchers found pencils with 93% graphite were the best for creating a variety of on-skin bioelectronic devices drawn on commercial office copy paper. Yan said a biocompatible spray-on adhesive could also be applied to the paper to help it stick better to a person's skin.

 

논문에서 퍼온 것

pencil-drawn graphite patterns (or combined with other compounds) serve as conductive traces and sensing electrodes, and office-copy papers work as flexible supporting substrates.

Notably, the qualities of recorded signals are comparable to those measured with conventional methods. Moreover, humidity energy harvesters are prepared by creating a gradient distribution of oxygen-containing groups on office-copy papers between pencildrawn electrodes

their high flexibility and breathability can benefit their applications in on-skin electronic

The graphite particles are rubbed off due to friction between the pencil lead and the rough and porous paper substrate in a writing cycle, where conductive graphite flakes are transferred to papers.

 

 

reference

Pencil–paper on-skin electronics, Proceedings of the National Academy of Sciences (2020). DOI: 10.1073/pnas.2008422117