Multilayer Graphene Epidermal Electronic Skin.

Due to the excellent flexibility, graphene has an important application prospect in epidermal electronic sensors. However, there are drawbacks in current devices, such as sensitivity, range, lamination, and artistry. In this work, we have demonstrated a graphene artwork epidermal sensor based on laser scribing graphene (LSG), whose patterns are programmable. A new process has been developed to remove the unreduced graphene oxide (GO). This unique method makes the graphene artworks can not only be transferred to the leaves, butterflies, human bodies and any other objects inseparably and elegantly, merely with the assistance of water, but also have better sensitivity and stability. When packed in Ecoflex, the artworks exhibit excellent performance, including ultra-high sensitivity (gauge factor up to 673), large strain range (as high as 10 %), and long-term stability. Therefore, many subtle physiological signals can be detected based on artworks with single graphene line. Artworks with multiple graphene lines are employed to detect large-range human motion. To provide deeper understanding of the resistance variation mechanism, a physical model is established to explain the relationship between the crack directions and electrical characteristics. These results show that graphene epidermal artworks have huge potential in health care and intelligent systems.