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: Journal article publicationJournal articleAcademic researchpeer-review

55 Citations (Scopus)

Abstract

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 languageEnglish
Pages (from-to)35-44
Number of pages10
JournalNanoscale Horizons
Volume3
Issue number1
DOIs
Publication statusPublished - Jan 2018
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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