以聚丙烯酰胺水凝胶为基底材料,通过引入纤维素纳米纤维(CNF)作为分散介质,辅助分散MXene纳米片,从而制备出一系列MXene/CNF/PAM复合水凝胶。进一步对其微观结构、力学性能、电学性能进行表征,并深入分析其作为柔性应变传感器的传感性能。结果表明:当MXene质量分数为2%,CNF质量分数为4%时,所制得的MXene/CNF/PAM复合水凝胶表现出优异的力学性能,如:断裂强度与断裂伸长率分别达到117.76kPa与422.43%,同时具有高电导率(0.247S/m)。其在210%到400%应变范围具有高灵敏度(GF=4.15)、极快的响应时间(74.78ms)和优异的稳定性。该复合水凝胶有望作为柔性可穿戴传感器,在生物医学、人机交互和电子传感等领域得到广泛的应用。
A series of MXene/CNF/PAM composite hydrogels were prepared by using polyacrylamide hydrogels as the substrate material and introducing cellulose nanofibers (CNF) as the dispersion medium to assist the dispersion of MXene nanosheets.Their microstructure,mechanical properties,and electrical properties were further characterized,and their sensing performance as flexible strain sensors was analyzed in depth.The results showed that when the mass percentage of MXene was 2% and the mass percentage of CNF was 4%,the produced MXene/CNF/PAM composite hydrogel exhibited excellent mechanical properties,such as breaking strength and elongation at break of 117.76kPa and 422.43%,respectively,as well as high electrical conductivity of 0.247S/m.It had high sensitivity (GF=4.15),a very fast response time (74.78ms),and excellent stability in the strain range of 210% to 400%.The composite hydrogel is expected to find wide applications as a flexible wearable sensor in biomedicine,human-computer interaction,and electronic sensing.
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基金资助
山西省自然科学基金项目(2021-0302123158);山西浙大新材料与化工研究院项目(2022SX-TD023)
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