State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an, 710049, China.
ZNDY of Ministerial Key Laboratory, School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Small. 2019 May;15(21):e1804651. doi: 10.1002/smll.201804651. Epub 2019 Apr 16.
Fabricating a strain sensor that can detect large deformation over a curved object with a high sensitivity is crucial in wearable electronics, human/machine interfaces, and soft robotics. Herein, an ionogel nanocomposite is presented for this purpose. Tuning the composition of the ionogel nanocomposites allows the attainment of the best features, such as excellent self-healing (>95% healing efficiency), strong adhesion (347.3 N m ), high stretchability (2000%), and more than ten times change in resistance under stretching. Furthermore, the ionogel nanocomposite-based sensor exhibits good reliability and excellent durability after 500 cycles, as well as a large gauge factor of 20 when it is stretched under a strain of 800-1400%. Moreover, the nanocomposite can self-heal under arduous conditions, such as a temperature as low as -20 °C and a temperature as high as 60 °C. All these merits are achieved mainly due to the integration of dynamic metal coordination bonds inside a loosely cross-linked network of ionogel nanocomposite doped with Fe O nanoparticles.
制备能够在曲面上检测大变形且具有高灵敏度的应变传感器对于可穿戴电子、人机界面和软机器人至关重要。本文提出了一种离子凝胶纳米复合材料来实现这一目标。通过调整离子凝胶纳米复合材料的组成，可以获得最佳的特性，如优异的自修复能力（>95%的修复效率）、强附着力（347.3 N m）、高拉伸性（2000%）以及在拉伸下超过十倍的电阻变化。此外，基于离子凝胶纳米复合材料的传感器在经过 500 次循环后具有良好的可靠性和出色的耐用性，并且在 800-1400%的应变下拉伸时具有 20 的大应变系数。此外，纳米复合材料可以在恶劣条件下（如低至-20°C 和高达 60°C 的温度）自修复。所有这些优点主要归因于动态金属配位键在掺杂 FeO 纳米粒子的离子凝胶纳米复合材料的松散交联网络中的集成。
