Amrutha Bindhu, Anand Prabu Arun, Pathak Madhvesh
Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore, 632014, India.
Heliyon. 2024 Apr 5;10(7):e29192. doi: 10.1016/j.heliyon.2024.e29192. eCollection 2024 Apr 15.
Flexible electrospun fiber-based piezoelectric nanogenerator (PENG) has attracted a lot of interest due to its ability of generating electrical energy from mechanical energy sources. The present work aims to improve the piezoelectric output of PENG devices based on electrospun polyvinylidene fluoride (PVDF) doped with nickel oxide nanoparticles (NiO NPs) in different concentrations (2, 4, 6, 8 and 10 wt.-%). Crystalline phase changes and -crystalline content in electrospun fibers were evaluated using XRD and FTIR-ATR, respectively. Surface morphology and surface roughness of the electrospun fibers were observed using FE-SEM and AFM, respectively. The hydrophobic nature of the fibers was analyzed using a wettability test. PENG output voltage and short-circuit current performance of neat PVDF and PVDF doped with NiO (PN) composite electrospun fibers were calculated using a customized variable-pressure setup with an optimized force of 1.0 kgf and 1.0 Hz frequency. Neat PVDF-based PENG exhibited only 1.7 V and 0.7 μA, whereas, PVDF doped with 6 wt.-% NiO NP (PN-6) based PENG generated a high output voltage of 5.5 V and 1.83 μA current. The optimized PN-6 PENG device is demonstrated for use in wearable devices towards identifying certain body movements like tapping, wrist movement, walking and running.
柔性电纺纤维基压电纳米发电机（PENG）因其能够从机械能源中产生电能而备受关注。目前的工作旨在提高基于电纺聚偏氟乙烯（PVDF）掺杂不同浓度（2、4、6、8和10重量％）的氧化镍纳米颗粒（NiO NPs）的PENG器件的压电输出。分别使用XRD和FTIR-ATR评估电纺纤维中的晶相变化和β-晶相含量。分别使用FE-SEM和AFM观察电纺纤维的表面形态和表面粗糙度。使用润湿性测试分析纤维的疏水性。使用定制的可变压力装置，在优化的1.0 kgf力和1.0 Hz频率下，计算纯PVDF和掺杂NiO（PN）复合电纺纤维的PENG输出电压和短路电流性能。基于纯PVDF的PENG仅表现出1.7 V和0.7μA，而掺杂6重量％NiO NP（PN-6）的PVDF基PENG产生了5.5 V的高输出电压和1.83μA的电流。优化后的PN-6 PENG器件被证明可用于可穿戴设备，以识别某些身体动作，如轻敲、手腕运动、行走和跑步。
