期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 2, 页码 2317-2327出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b19425
关键词
stretchable temperature sensor; elastomeric composite fiber; reduced graphene oxide; skin temperature monitoring; strain-insensitive sensor
资金
- Basic Science Research Program [2016R1A2A1A05005423]
- Nano Material Technology Development Program [NRF-2016M3A7B4910554]
- National Research Foundation (NRF) - Ministry of Science, ITC, and Future Planning [2015H1D3A1062350]
To realize the potential applications of stretchable sensors in the field of wearable health monitoring, it is essential to develop a stable sensing device with robust electrical and mechanical properties in the present of varying external conditions. Herein, we demonstrate a stretchable temperature sensor with the elimination of strain-induced interference via geometric engineering of the free-standing stretchable fibers (FSSFs) of reduced graphene oxide/polyurethane composite. The FSSFs were formed in serpentine structures and enabled the implementation of a strain-insensitive stretchable temperature sensor. On the basis of the controlled reduction time of graphene oxide, we can modulate the response and thermal index of the device. These results are attributed to the variation in the density of oxygen-containing functional groups in the FSSFs, which affect the hopping charge transport and thermal generation of excess carriers. The FSSF temperature sensor yields increased responsivity (0.8%/degrees C), stretchability (90%), sensing resolution (0.1 degrees C), and stability in response to applied stretching (+/- 0.37 degrees C for strains ranging from 0 to 50%). When the sensor is sewn onto a stretchable bandage and attached to the human body, it can detect the temperature changes of the human skin during different body motions in a continuous and stable manner.
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