Sun Xuzhou, Wan Yingjie, Fang Yuqiang, Huang Fuqiang
State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China.
Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China.
Small Sci. 2023 Nov 29;4(2):2300125. doi: 10.1002/smsc.202300125. eCollection 2024 Feb.
2D ferroelectric materials have attracted much interest due to their potential for developing flexible self-powered nanogenerators. Niobium oxide diiodide (NbOI) has in-plane anisotropy of electrical properties and large lateral piezoelectric coefficient, which makes it possess high-performance and unique behavior in flexible sensing. In this work, multidirectional piezoelectric nanogenerator (PENG) devices using NbOI flake are fabricated and excellent energy harvesting and sensing capabilities are found. Specifically, the NbOI-based PENG can exhibit a long-time stable voltage output of 215 mV at a large strain of 1.1%. More importantly, the periodic output signal pattern of the twelve-electrode NbOI-based PENG in six directions is investigated, and this anisotropy provides the possibility of achieving simultaneous signal harvesting in multiple directions. This work broadens the scope of applications of 2D materials in nano-energy and provides new ideas and insights for further exploration of nano-energy and smart wearable nano-electronic devices.
二维铁电材料因其在开发柔性自供电纳米发电机方面的潜力而备受关注。二碘化铌氧化物（NbOI）具有面内电学性质各向异性和大的横向压电系数，这使其在柔性传感方面具有高性能和独特行为。在这项工作中，制备了使用NbOI薄片的多向压电纳米发电机（PENG）器件，并发现其具有优异的能量收集和传感能力。具体而言，基于NbOI的PENG在1.1%的大应变下可表现出215 mV的长时间稳定电压输出。更重要的是，研究了基于NbOI的十二电极PENG在六个方向上的周期性输出信号模式，这种各向异性为实现多方向同时信号收集提供了可能性。这项工作拓宽了二维材料在纳米能源中的应用范围，并为进一步探索纳米能源和智能可穿戴纳米电子器件提供了新的思路和见解。
