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首页> 外文期刊>Composites Science and Technology >Temperature-responsive and piezoresistive performances of poly(N-isopropylacrylamide)-grafted reduced graphene oxide smart fiber
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Temperature-responsive and piezoresistive performances of poly(N-isopropylacrylamide)-grafted reduced graphene oxide smart fiber

机译：聚（N-异丙基丙烯酰胺）接枝还原氧化石墨烯智能纤维的温度响应和压阻性能

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摘要

In this work, temperature-responsive poly(N-isopropylacrylamide) (PNIPAm) was covalently grafted onto the edge of graphene oxide (GO) sheets through a facial method cross-linked by 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl) and N-hydroxysuccinimide in aqueous solution at room temperature. Then, the dispersion was wet spun to form a GO composite fiber. Scanning electron microscopy images suggest that severe edge distortions occur in PNIPAm-g-rGO hybrid fibers, indicating the covalent attaching of PNIPAm molecules onto the edge of graphene sheets. The PNIPAm-g-rGO fibers showed more favorable and improved electrical property than the pristine rGO fibers. Moreover, the coil-to-globule transition of the end-grafted PNIPAm chains was partially restricted by graphene sheets in the composite fiber, thereby causing the elevation of the phase transition temperature. Switching test of temperature-responsive versus electrical conductivity function has proved that the observed temperature-induced electrical conversion of the fibers was highly reversible and reproducible. Simultaneously, the composite fiber exhibited higher piezoresistive sensitivity compared with neat fiber. This smart fiber has shown remarkable potential for intelligent strain sensors, textiles, actuators, wires and on/off switches.
机译：在这项工作中，通过1-（3-二甲基氨基丙基）-3-乙基碳二亚胺盐酸盐交联的面部方法将温度敏感的聚（N-异丙基丙烯酰胺）（PNIPAm）共价接枝到氧化石墨烯（GO）片材的边缘。室温下在水溶液中加入EDC·HCl）和N-羟基琥珀酰亚胺。然后，将分散体湿纺以形成GO复合纤维。扫描电子显微镜图像表明，在PNIPAm-g-rGO杂化纤维中发生了严重的边缘变形，表明PNIPAm分子共价附着在石墨烯片的边缘上。与原始rGO纤维相比，PNIPAm-g-rGO纤维显示出更好的电性能。此外，复合纤维中的石墨烯片部分限制了末端接枝的PNIPAm链的盘绕至球状转变，从而引起了相变温度的升高。温度响应与电导率函数的转换测试已证明，观察到的纤维引起的温度诱导的电转化是高度可逆的和可再现的。同时，与纯纤维相比，复合纤维表现出更高的压阻敏感性。这种智能光纤在智能应变传感器，纺织品，执行器，电线和开/关开关方面显示出了巨大的潜力。

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