Journal
CHEMICAL ENGINEERING JOURNAL
Volume 417, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127966
Keywords
Strain sensor; Cu@PPy NW-threaded Ag NFs; Fracture sensing mechanism; Sensing range
Categories
Funding
- National Natural Science Foundation of China [21601065]
- Natural Science Foundation of Shandong Province [ZR2017MEM006]
- National Research Foundation of Korea [NRF-2015R1A3A2066337]
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In this study, a versatile conductive composite with excellent electromechanical performance was fabricated using a simple, energy-saving, and scalable method. The composite demonstrated wide sensing range and high sensitivity, allowing for monitoring full-range human motions efficiently.
Although the development of wearable strain sensors with a wide sensing range (>50%) and high sensitivity (gauge factor (GF), > 100) is highly desirable, it also presents a grand challenge owing to the inverse relationship between sensitivity and sensing range in designing strain-sensing materials and geometric structures. In this study, we fabricate versatile conductive composites by embedding polypyrrole-coated copper nanowire (Cu@PPy NW)-threaded Ag nanoflowers (NFs) in a poly(styrene-block-butadiene-block-styrene) (SBS) matrix. The fabrication process is simple, energy-saving, and scalable. Moreover, the obtained cluster structures derived from Cu@PPy NW-threaded Ag NFs endow the composites with excellent electromechanical performance, which is demonstrated by its wide sensing range (up to 185% strain), high sensitivity (GF up to 1.28 x 10(6)), as well as excellent reliability and stability. The superiority in sensing range and sensitivity is a result of the combination of the fracture-sensing mechanism, constrained crack-propagation mechanism by the matrix, slippage-sensing mechanism, and double bridge functions of Ag NFs and Cu@PPy NWs. The high performance allows the strain sensors to monitor full-range human motions.
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