Sliced graphene foam films for dual-functional wearable strain sensors and switches

Qingbin Zheng, Xu Liu, Hongru Xu, Ming Shu Cheung, Yuk Wa Choi, Hsing Chih Huang, Ho Yin Lei, Xi Shen, Zhenyu Wang, Ying Wu, Soo Young Kim, Jang Kyo Kim

Research output: Contribution to journalArticlepeer-review

93 Scopus citations


The demand for wearable sensors is growing in many emerging fields, such as health monitoring, human-machine interfaces, robotics and personalized medicine. Here, we report the integration of skin-mountable, flexible, stretchable, dual-functional sensors and switches together with silicon-based electronics to create a novel healthcare system. We employ a facile approach to design highly stretchable graphene foam (GF)/PDMS composite films with tunable sensitivities and switching capabilities by simply controlling the thickness of GF. The GF/PDMS composite films deliver a high gauge factor of 24 at a 10% strain, tunable stretchability up to 70% and an excellent on/off switching ratio on the order of 1000. The highly reversible switching capability of the composite films is realized by identifying abnormal resistance changes at strains beyond a threshold value. To bridge the gap between signal transmission, wireless communication and post-processing in wearable devices, the sensors are combined with electronics, allowing data transmission to a smartphone using a custom-developed application consisting of a user-friendly interface. The novel approaches reported here offer a wide range of practical applications, including medical diagnosis, health monitoring and patient healthcare.

Original languageBritish English
Pages (from-to)35-44
Number of pages10
JournalNanoscale Horizons
Issue number1
StatePublished - Jan 2018


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