Preparation and sensing properties of PVA-AgNWs@PVA hydrogel fibers
To solve the shortcomings of traditional fiber-based sensors with single function and narrow strain range,PVA-AgNWs@PVA hydrogel fibers were prepared by coaxial wet spinning with polyvinyl alcohol(PVA)as the hydrogel substrate,silver nanowires(AgNWs)as the core filler and temperature-sensitive powder as the skin filler,and then the fibers were preserved in a 4 mol/L NaCl solution for 72 hours to improve the performance of the fibers;and the temperature and tensile sensing properties of the PVA-AgNWs@PVA hydrogel fibers were measured.The results show that the PVA-AgNWs@PVA hydrogel fibers were dark blue when the ambient temperature was less than 17 ℃,blue-gray when it was in the range of 18 ℃ to 27 ℃,light red when it was in the range of 28 ℃ to 35 ℃,and grayish-white when it was greater than 36 ℃;the elongation at break of the fibers was 374％,the tensile strength was 3.65 MPa,the electrical conductivity was 5.12 S/m,and the sensitivity to strain was 3.57,and the relative resistance varied consistently under the movement of high frequency.Thus,the PVA-AgNWs@PVA hydrogel fibers have excellent temperature and tensile sensing properties and boast potential application value in the field of flexible wearable devices.
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