One-dimensional (1D) nanostructures of perovskite piezoelectrics exhibit unique properties that distinct them from those of their bulk and thin-film counterparts. These 1D nanostructures feature cantilever-like flexibility and elasticity, a relatively high piezoelectric constant, good stability and easiness of integration, making them highly promising for applications in energy harvesting, pressure sensing, piezo-catalysis, nano-actuators and smart human-machine interfaces. Among them, (K,Na)NbO₃ (KNN) has been regarded as one of the most promising lead-free perovskite piezoelectrics owing to its excellent biocompatibility, good piezoelectric performance, and high Curie temperature. Recently, significant efforts have been made to develop high-performance 1D KNN nanostructures (1D KNNs). However, the controllable growth and enhancement in piezoelectric performance of 1D KNNs remain challenging. In this work, we systematically re-examine the effective approaches for the growth of 1D KNNs and explore their unique properties. Key strategies for structural designs and performance optimization are proposed based on the recent progress, along with perspectives in developing novel functionalities and micro/nano-devices such as energy harvesters, information storage, electronic skins, biomedical applications.

中文翻译：

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一维铌酸钠钾 （1D KNN）：性能优化及应用前景


钙钛矿压电体的一维 （1D） 纳米结构表现出独特的特性，使其有别于体和薄膜同类结构。这些一维纳米结构具有类似悬臂的柔韧性和弹性、相对较高的压电常数、良好的稳定性和易于集成的特性，使其在能量收集、压力传感、压电催化、纳米致动器和智能人机界面等领域的应用前景广阔。其中，（K，Na）NbO ₃ （KNN） 因其优异的生物相容性、良好的压电性能和较高的居里温度而被认为是最有前途的无铅钙钛矿压电体之一。最近，人们为开发高性能 1D KNN 纳米结构 （1D KNN） 做出了重大努力。然而，一维 KNN 压电性能的可控增长和增强仍然具有挑战性。在这项工作中，我们系统地重新审视了 1D KNN 生长的有效方法并探索了它们的独特特性。根据最近的进展，提出了结构设计和性能优化的关键策略，并展望了开发新功能和微/纳米器件，如能量收集器、信息存储、电子皮肤、生物医学应用。