用于柔性电子传感器的高度可拉伸和灵敏的 Ti3C2Tx MXene/海藻酸钠/丙烯酰胺水凝胶,ACS Applied Polymer Materials

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用于柔性电子传感器的高度可拉伸和灵敏的 Ti3C2Tx MXene/海藻酸钠/丙烯酰胺水凝胶
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2022-10-24 , DOI: 10.1021/acsapm.2c01169
Jinghua Liu ₁ , Xuejie Meng ₁ , Fan Dong ₁ , Suyu Ren ₁ , Bo Wang ₂ , Feng Tan ₁

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柔性传感器需要良好的拉伸特性、柔韧性和足够的灵敏度，以监测和传输运动中的细微应变变化。在这里，MXene-海藻酸钠-丙烯酰胺 (MSA) 复合水凝胶是通过丙烯酰胺 (AM)、Ti ₃ C ₂ T _x MXene 纳米片和海藻酸钠 (SA) 的聚合反应合成的。扫描电子显微镜、能量色散光谱和元素映射证明了 Ti ₃ C ₂ T _x MXene 纳米片在复合水凝胶方案中的均匀分散。_{Ti 3} C ₂ T _x之间的强氢键相互作用通过傅里叶变换红外光谱和差示扫描量热分析验证了 MXene 纳米片和 SA-AM 聚合物。制备的 M ₂₀ S _2.5 A 水凝胶具有 4350% 的有限拉伸应变和高达 359.51 J m ^-2的断裂能，在循环加载-卸载实验中具有显着的滞后，表明其具有优异的能量耗散性能。_{M 20} S _2.5的电导率水凝胶具有良好的线性响应（1300-3500%），拉伸距离和快速响应时间为 0.27 秒。同时，MSA 水凝胶具有高灵敏度（GF = 2.31）。这些优势使其能够实时监测人体的随机运动，如咽喉吞咽、手指弯曲、膝关节屈伸等。本研究显示了 MSA 水凝胶在柔性可穿戴设备中的巨大潜力。

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Highly Stretchable and Sensitive Ti3C2Tx MXene/Sodium Alginate/Acrylamide Hydrogel for Flexible Electronic Sensors

Flexible sensors require good tensile properties, flexibility, and enough sensitivity for monitoring and transmitting subtle strain changes in motion. Here, the MXene-sodium alginate-acrylamide (MSA) composite hydrogel was synthesized by polymerization of acrylamide (AM), Ti₃C₂T_x MXene nanosheets, and sodium alginate (SA). Scanning electron microscopy, energy dispersive spectroscopy, and elemental mapping demonstrated a uniform dispersion of Ti₃C₂T_x MXene nanosheets in the composite hydrogel regime. The strong hydrogen bonding interactions between Ti₃C₂T_x MXene nanosheets and SA–AM polymers were verified by Fourier transform infrared spectroscopy and differential scanning calorimetry analysis. The prepared M₂₀S_2.5A hydrogel had 4350% limited tensile strain and fractured energies up to 359.51 J m^–2 and significant hysteresis in cyclic loading–unloading experiments, indicating its excellent energy dissipation performance. The conductivity of the M₂₀S_2.5A hydrogel had a good linear response (1300–3500%) with the stretch distance and a fast response time of 0.27 s. At the same time, MSA hydrogels have high sensitivity (GF = 2.31). These advantages allowed it to real-time monitor the random motion of the human body such as throat swallowing, finger bending, and knee flexion and extension. The present study showed great potentials of the MSA hydrogel in flexible wearable devices.

更新日期：2022-10-24

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