A highly sensitive, low-cost, wearable pressure sensor based on conductive hydrogel spheres

被引:136
作者
Tai, Yanlong [1 ]
Mulle, Matthieu [1 ]
Ventura, Isaac Aguilar [1 ]
Lubineau, Gilles [1 ]
机构
[1] KAUST, Phys Sci & Engn Div, COHMAS Lab, Thuwal 239556900, Saudi Arabia
关键词
ELECTRONIC SKIN; TRIBOELECTRIC NANOGENERATORS; FABRICATION; TRANSISTORS; MATRIX;
D O I
10.1039/c5nr03155a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Wearable pressure sensing solutions have promising future for practical applications in health monitoring and human/machine interfaces. Here, a highly sensitive, low-cost, wearable pressure sensor based on conductive single-walled carbon nanotube (SWCNT)/alginate hydrogel spheres is reported. Conductive and piezoresistive spheres are embedded between conductive electrodes (indium tin oxide-coated polyethylene terephthalate films) and subjected to environmental pressure. The detection mechanism is based on the piezoresistivity of the SWCNT/alginate conductive spheres and on the sphere-electrode contact. Step-by-step, we optimized the design parameters to maximize the sensitivity of the sensor. The optimized hydrogel sensor exhibited a satisfactory sensitivity (0.176 Delta R/R-0/kPa(-1)) and a low detectable limit (10 Pa). Moreover, a brief response time (a few milliseconds) and successful repeatability were also demonstrated. Finally, the efficiency of this strategy was verified through a series of practical tests such as monitoring human wrist pulse, detecting throat muscle motion or identifying the location and the distribution of an external pressure using an array sensor (4 x 4).
引用
收藏
页码:14766 / 14773
页数:8
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