Zhang Wei, Yang Hongmei, Li Li, Lin Shiquan, Ji Peiyuan, Hu Chenguo, Zhang Dazhi, Xi Yi
Department of Applied Physics, State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, People's Republic of China.
Nanotechnology. 2020 Sep 18;31(38):385401. doi: 10.1088/1361-6528/ab991f. Epub 2020 Jun 3.
Wurtzite-structured CdS material is widely used in information sensing and energy harvesting. Based on the piezoelectric property of CdS, we present a flexible piezoelectric nanogenerator (PENG) with three-dimensional-structured CdS nanowall arrays. Under index finger oscillations at a slow rate, the maximal open-circuit voltage and short-circuit current are 1.2 V and 6 nA respectively. Meanwhile, the working mechanism of this PENG was successfully studied with piezoelectric potential distribution and energy band theory respectively. All of the results show that an increase in the bending degree and bending frequency will affect the output of the PENG, suggesting that it can be used as a flexible sensor. In addition, the fabricated PENG can be used as a self-powered pressure sensor relying on the linear relationship between the output voltage and the vertical pressure. This work may provide a new approach to fabricating piezoelectric nanogenerators based on three-dimensional materials as an energy harvester, which may also facilitate the development of flexible and wearable electric sensing technology.
纤锌矿结构的硫化镉材料广泛应用于信息传感和能量收集领域。基于硫化镉的压电特性，我们展示了一种具有三维结构硫化镉纳米壁阵列的柔性压电纳米发电机（PENG）。在食指缓慢振荡的情况下，最大开路电压和短路电流分别为1.2伏和6纳安。同时，分别利用压电势分布和能带理论成功研究了该PENG的工作机制。所有结果表明，弯曲程度和弯曲频率的增加会影响PENG的输出，这表明它可作为一种柔性传感器。此外，制成的PENG可作为自供电压力传感器，这依赖于输出电压与垂直压力之间的线性关系。这项工作可能为基于三维材料制造作为能量收集器的压电纳米发电机提供一种新方法，这也可能促进柔性和可穿戴电传感技术的发展。
