Kim Jung Hyuk, Kim Bosung, Kim Sang-Woo, Kang Hyun Wook, Park Min-Chul, Park Dong Hee, Ju Byeong Kwon, Choi Won Kook
Center for Opto-Electronic Materials and Devices, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST), Hwarangro 14 Gil 5, Sungbuk Gu, Seoul, 02792, Republic of Korea.
Department of Electronic, Electrical, and Computer Engineering, College of Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
Nanotechnology. 2021 Apr 2;32(14):145401. doi: 10.1088/1361-6528/abd57e.
Coaxial type piezoelectric energy generator (C-PEG) nanofiber was fabricated by a self-designed continuous electrospinning deposition system. Piezoelectric PVDF-TrFE nanofiber as an electroactive material was electrospun at a discharge voltage of 9-12 kV onto a simultaneously rotating and transverse moving Cu metal wire at an angular velocity of ω = 60-120 RPM. The piezoelectric coefficient d of the PVDF-TrFE nanofiber was approximately -20 pm V. The generated output voltage (V ) increased according to the relationship exp(-α P) (α = 0.41- 0.57) as the pressure (P) increased from 30 to 500 kpa. The V values for ten and twenty pieces of C-PEG were V = 3.9 V and 9.5 V at P = 100 kpa, respectively, relatively high output voltages compared to previously reported values. The high V for the C-PEG stems from the fact that it can generate a fairly high V due to the increased number of voltage collection points compared to a conventional two-dimensional (2-dim) capacitor type of piezoelectric film or fiber device. C-PEG yarn was also fabricated via the dip-coating of a PDMS polymer solution, followed by winding with Ag-coated nylon fiber as an outer electrode. The current and power density of ten pieces of C-PEG yarn were correspondingly 22 nA cm and 8.6 μW cm at V = 1.97 V, higher than previously reported values of 5.54 and 6 μW cm. The C-PEG yarn, which can generate high voltage compared to the conventional film/nanofiber mat type, is expected to be very useful as a wearable energy generator system.
通过自行设计的连续静电纺丝沉积系统制备了同轴型压电能量发生器（C-PEG）纳米纤维。作为电活性材料的压电聚偏氟乙烯-三氟乙烯（PVDF-TrFE）纳米纤维在9-12 kV的放电电压下，以ω = 60-120转/分钟的角速度静电纺丝到同时旋转和横向移动的铜金属丝上。PVDF-TrFE纳米纤维的压电系数d约为-20皮米/伏。随着压力（P）从30千帕增加到500千帕，产生的输出电压（V）根据指数关系exp(-αP)（α = 0.41-0.57）而增加。在P = 100千帕时，十根和二十根C-PEG的V值分别为V = 3.9伏和9.5伏，与先前报道的值相比，输出电压相对较高。C-PEG的高V值源于这样一个事实，即与传统的二维（2-D）电容器型压电薄膜或纤维装置相比，它由于集电点数量的增加而能够产生相当高的V值。C-PEG纱线也是通过浸涂聚二甲基硅氧烷（PDMS）聚合物溶液，然后用涂银尼龙纤维作为外电极缠绕制成的。在V = 1.97伏时，十根C-PEG纱线的电流和功率密度分别为22纳安/平方厘米和8.6微瓦/平方厘米，高于先前报道的5.54和6微瓦/平方厘米的值。与传统的薄膜/纳米纤维垫类型相比，能够产生高电压的C-PEG纱线有望作为可穿戴能量发生器系统非常有用。
