Highly Flexible, High-Performance, and Stretchable Piezoelectric Sensor Based on a Hierarchical Droplet-Shaped Ceramics with Enhanced Damage Tolerance.
Highly Flexible, High-Performance, and Stretchable Piezoelectric Sensor Based on a Hierarchical Droplet-Shaped Ceramics with Enhanced Damage Tolerance.
复制标题
基于分层水滴形陶瓷的高柔性、高性能、可拉伸压电传感器，具有增强的损伤容限。
DOI：
10.1002/adma.202311624
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发表时间：
2024
期刊：
影响因子：
--
通讯作者：
Xu Q
中科院分区：
文献类型：
--
作者：
Xu Q
可拉伸自供电传感器在下一代可穿戴电子产品中引起了人们的极大兴趣。然而，目前基于压电聚合物或0-3压电复合材料创建可拉伸压电传感器的策略面临着一些挑战，例如压电活性低、灵敏度低和耐用性差。在本文中，采用仿生软刚混合策略来构造一种新型的高柔性、高性能和可拉伸的压电传感器。受铰链双壳动物Cristaria plicata的启发，制造了分层水滴状陶瓷并将其用作刚性部件，其中计算模型表明，这种仿生结构独特的拱形曲面和圆角可以缓解应力集中。为了确保拉伸过程中压电相的电连接性，图案化的液态金属充当软电路，具有优化润湿性和拉伸性的有机硅聚合物充当软组件，与分层陶瓷形成强大的机械联锁。新颖的传感器设计表现出出色的灵敏度和耐用性，在 60% 应变下进行 5000 次拉伸循环和 180° 进行 5000 次扭转循环后，开路电压保持稳定。为了展示其在医疗保健应用中的潜力，这种新型可拉伸传感器成功用于无线手势识别和评估膝骨关节炎的进展。
Stretchable self‐powered sensors are of significant interest in next‐generation wearable electronics. However, current strategies for creating stretchable piezoelectric sensors based on piezoelectric polymers or 0–3 piezoelectric composites face several challenges such as low piezoelectric activity, low sensitivity, and poor durability. In this paper, a biomimetic soft‐rigid hybrid strategy is used to construct a new form of highly flexible, high‐performance, and stretchable piezoelectric sensor. Inspired by the hinged bivalveCristaria plicata, hierarchical droplet‐shaped ceramics are manufactured and used as rigid components, where computational models indicate that the unique arched curved surface and rounded corners of this bionic structure can alleviate stress concentrations. To ensure electrical connectivity of the piezoelectric phase during stretching, a patterned liquid metal acts as a soft circuit and a silicone polymer with optimized wettability and stretchability serves as a soft component that forms a strong mechanical interlock with the hierarchical ceramics. The novel sensor design exhibits excellent sensitivity and durability, where the open circuit voltage remains stable after 5000 stretching cycles at 60% strain and 5000 twisting cycles at 180°. To demonstrate its potential in heathcare applications, this new stretchable sensor is successfully used for wireless gesture recognition and assessing the progression of knee osteoarthritis.