Huang You-Jun, Tsai Chi-Hung, Hung Chia-Wei, Chung Chen-Kuei
Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan.
Polymers (Basel). 2024 Dec 2;16(23):3397. doi: 10.3390/polym16233397.
A triboelectric nanogenerator (TENG) is a kind of energy harvester which converts mechanical energy into electrical energy with electron transfer and transport between two different materials during cycling tribology. To increase the contact area between tribo-layers and enhance the output of TENGs, many studies prepare patterned micro/nanostructured tribo-layers using semiconductor processes like lithography and etching at high cost and with long processing times. Here, we propose a new method to quickly produce high-aspect-ratio (HAR) microneedles of polydimethylsiloxane (PDMS) for TENG triboelectric layers using a two-pulse laser-ablated polymethyl methacrylate mold and casting. It has the merit of employing low-cost CO laser microfabrication and polymer casting in a feasible way to produce efficient tribo-electric layers. Two-pulse laser ablation is an efficient method for fabricating HAR microstructures with increasing depth at a constant width and density compared to single-pulse ablation. It enhances the depth of microneedles at a constant width and successfully casts PDMS tribo-layers with microneedles that have an aspect ratio 1.88 times higher than those produced by the traditional single-pulse process. The microneedle-PDMS (MN-PDMS) layer is combined with Al sheets to form the MN-PDMS-Al TENG. Compared with the flat PDMS-Al TENG and single-pulse PDMS-Al TENG, the two-pulse TENG enhances open-circuit voltage (V) by 1.63 and 1.48 times, the short-circuit current (I) by 1.92 and 1.47 times, and the output power by 3.69 and 2.16 times, respectively. This two-pulse ablation method promotes the output performance of TENGs, which has the potential for applications in self-powered devices and sustainable energy.
摩擦电纳米发电机（TENG）是一种能量收集器，它在循环摩擦学过程中通过两种不同材料之间的电子转移和传输将机械能转化为电能。为了增加摩擦层之间的接触面积并提高TENG的输出，许多研究使用光刻和蚀刻等高成本且加工时间长的半导体工艺来制备图案化的微/纳米结构摩擦层。在此，我们提出一种新方法，使用双脉冲激光烧蚀聚甲基丙烯酸甲酯模具并浇铸，快速生产用于TENG摩擦电层的聚二甲基硅氧烷（PDMS）高纵横比（HAR）微针。它具有以可行的方式采用低成本的CO激光微加工和聚合物浇铸来生产高效摩擦电层的优点。与单脉冲烧蚀相比，双脉冲激光烧蚀是一种以恒定宽度和密度增加深度来制造HAR微结构的有效方法。它在恒定宽度下增加了微针的深度，并成功浇铸了具有微针的PDMS摩擦层，其纵横比比传统单脉冲工艺生产的微针高1.88倍。微针-PDMS（MN-PDMS）层与铝板结合形成MN-PDMS-Al TENG。与平面PDMS-Al TENG和单脉冲PDMS-Al TENG相比，双脉冲TENG的开路电压（V）分别提高了1.63倍和1.48倍，短路电流（I）分别提高了1.92倍和1.47倍，输出功率分别提高了3.69倍和2.16倍。这种双脉冲烧蚀方法提高了TENG的输出性能，在自供电设备和可持续能源方面具有应用潜力。
