Measurement and Sensor Technology, Faculty of Electrical Engineering and Information Technology, Technische Universität Chemnitz, Reichenhainer Straße 70, 09126 Chemnitz, Germany.
Materials and Reliability of Microsystems, Faculty of Electrical Engineering and Information Technology, Technische Universität Chemnitz, Reichenhainer Straße 70, 09126 Chemnitz, Germany.
Sensors (Basel). 2022 May 31;22(11):4181. doi: 10.3390/s22114181.
Wearable sensors are gaining attention in human health monitoring applications, even if their usability is limited due to battery need. Flexible nanogenerators (NGs) converting biomechanical energy into electrical energy offer an interesting solution, as they can supply the sensors or extend the battery lifetime. Herein, flexible generators based on lead-free barium titanate (BaTiO) and a polydimethylsiloxane (PDMS) polymer have been developed. A comparative study was performed to investigate the impact of multiwalled carbon nanotubes (MWCNTs) via structural, morphological, electrical, and electromechanical measurements. This study demonstrated that MWCNTs boosts the performance of the NG at the percolation threshold. This enhancement is attributed to the enhanced conductivity that promotes charge transfer and enhanced mechanical property and piezoceramics particles distribution. The nanogenerator delivers a maximum open-circuit voltage (V) up to 1.5 V and output power of 40 nW, which is two times higher than NG without MWCNTs. Additionally, the performance can be tuned by controlling the composite thickness and the applied frequency. Thicker NG shows a better performance, which enlarges their potential use for harvesting biomechanical energy efficiently up to 11.22 V under palm striking. The voltage output dependency on temperature was also investigated. The results show that the output voltage changes enormously with the temperature.
可穿戴传感器在人体健康监测应用中受到关注，尽管由于电池需求，其可用性有限。将生物力学能量转换为电能的柔性纳米发电机 (NG) 提供了一个有趣的解决方案，因为它们可以为传感器供电或延长电池寿命。本文开发了基于无铅钛酸钡 (BaTiO) 和聚二甲基硅氧烷 (PDMS) 聚合物的柔性发电机。通过结构、形态、电气和机电测量进行了比较研究，以研究多壁碳纳米管 (MWCNT) 的影响。这项研究表明，MWCNT 在渗流阈值处提高了 NG 的性能。这种增强归因于增强的导电性，促进了电荷转移，以及增强的机械性能和压电陶瓷颗粒分布。纳米发电机提供的开路电压 (V) 高达 1.5V，输出功率为 40nW，是没有 MWCNT 的 NG 的两倍。此外，通过控制复合材料的厚度和施加的频率，可以调整性能。较厚的 NG 表现出更好的性能，这扩大了它们在有效收集生物力学能量方面的潜在用途，在手掌击打下最大输出电压可达 11.22V。还研究了电压输出对温度的依赖性。结果表明，输出电压随温度变化很大。
