Carbon Dots-Based Ultrastretchable and Conductive Hydrogels for High-Performance Tactile Sensors and Self-Powered Electronic Skin,Small

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Carbon Dots-Based Ultrastretchable and Conductive Hydrogels for High-Performance Tactile Sensors and Self-Powered Electronic Skin
Small ( IF 13.0 ) Pub Date : 2022-09-22 , DOI: 10.1002/smll.202204365
Yunfei Yu ₁ , Yiyu Feng _{1,

2,

3} , Feng Liu ₁ , Hui Wang ₁ , Huitao Yu ₁ , Kun Dai ₂ , Guoqiang Zheng ₃ , Wei Feng _{1,

2,

3}

Affiliation

Smart tactile sensing materials have excellent development prospects, including wearable health-monitoring equipment and energy collection. Hydrogels have received extensive attention in tactile sensing owing to their transparency and high elasticity. In this study, highly crosslinked hydrogels are fabricated by chemically crosslinking polyacrylamide with lithium magnesium silicate and decorated with carbon quantum dots. Magnesium lithium silicate provides abundant covalent bonds and improves the mechanical properties of the hydrogels. The luminescent properties endowed by the carbon dots further broaden the application of hydrogels for realizing flexible electronics. The hydrogel-based strain sensor exhibits excellent sensitivity (gauge factor 2.6), a broad strain response range (0–2000%), good cyclicity, and durability (1250). Strain sensors can be used to detect human motions. More importantly, the hydrogel can also be used as a flexible self-supporting triboelectric electrode for effectively detecting pressure in the range of 1–25 N and delivering a short-circuit current (I_SC) of 2.6 µA, open-circuit voltage (V_OC) of 115 V, and short-circuit transfer charge (Q_SC) of 29 nC. The results reveal new possibilities for human–computer interactions and electronic robot skins.

中文翻译：

用于高性能触觉传感器和自供电电子皮肤的碳点超拉伸导电水凝胶

智能触觉传感材料具有良好的发展前景，包括可穿戴健康监测设备和能量收集。水凝胶由于其透明性和高弹性而在触觉传感领域受到广泛关注。在这项研究中，通过化学交联聚丙烯酰胺与硅酸镁锂制备高度交联的水凝胶，并用碳量子点装饰。硅酸镁锂提供丰富的共价键并改善水凝胶的机械性能。碳点赋予的发光特性进一步拓宽了水凝胶在实现柔性电子产品方面的应用。基于水凝胶的应变传感器具有出色的灵敏度（应变系数2.6）、宽应变响应范围（0-2000%）、良好的循环性和耐用性（1250）。应变传感器可用于检测人体运动。更重要的是，该水凝胶还可以用作柔性自支撑摩擦电电极，有效检测1-25 N范围内的压力，并提供2.6 µA的短路电流（I _SC）、开路电压（V _OC）为 115 V，短路转移电荷（Q _SC）为 29 nC。研究结果揭示了人机交互和电子机器人皮肤的新可能性。

更新日期：2022-09-22

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