It remains challenging to prepare wearable strain and pressure sensors with excellent mechanical properties, ultra-high flexibility and sensitivity. Electrically conductive graphene platelets (GnPs) with high structural integrity are used in making a composite film fabricated using robust fabrication techniques. The gauge factor for the strain is up to 100 at 0-5% strain and 50 at 5%-30% strain, and the sensitivity to pressure is 2.7×10-2 kPa-1 between 0-10 kPa and 1.5×10-4 kPa-1 between 300-1000 kPa. In addition, the flexible sensor demonstrates good repeatability and durability after 1000 cycles of tensile and compression tests. The flexible sensor has fast response ability and a wide operating temperature range, suggesting the excellent response to temperature. The flexible sensor is applied in monitoring several human motions as a wearable device with high accuracy. The ability to detect strain, pressure and temperature of the flexible sensor extends its applications to multifunctional wearable devices.
Bibliographical noteThis is the peer reviewed version of the following article: Meng, Q, Liu, Z, Cai, R, Lu, S & Liu, T 2020, 'Non-oxidized graphene/elastomer composite films for wearable strain and pressure sensors with ultra-high flexibility and sensitivity', Polymers for Advanced Technologies, vol. 31, no. 2, pp. 214-225, which has been published in final form at https://onlinelibrary.wiley.com/doi/full/10.1002/pat.4760. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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FunderNational Natural Science Foundation of China (51973123), Natural Science Foundation of Liaoning Province-China (2019-MS-256), Aeronautical Science Foundation of China (2018ZF54036) and China Postdoctoral Science Foundation (2019M651151). Dr. Tianqing Liu is supported by NHMRC Early Career Fellowship (1112258).
- Composite films
- Flexible conductor