Choi Yoon-Young, Yun Tae Gwang, Qaiser Nadeem, Paik Haemin, Roh Hee Seok, Hong Jongin, Hong Seungbum, Han Seung Min, No Kwangsoo
1] Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea [2] Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
Graduate School of Energy Environment Water Sustainability, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea.
Sci Rep. 2015 Jun 4;5:10728. doi: 10.1038/srep10728.
PVDF and P(VDF-TrFE) nano- and micro- structures have been widely used due to their potential applications in several fields, including sensors, actuators, vital sign transducers, and energy harvesters. In this study, we developed vertically aligned P(VDF-TrFE) core-shell structures using high modulus polyurethane acrylate (PUA) pillars as the support structure to maintain the structural integrity. In addition, we were able to improve the piezoelectric effect by 1.85 times from 40 ± 2 to 74 ± 2 pm/V when compared to the thin film counterpart, which contributes to the more efficient current generation under a given stress, by making an effective use of the P(VDF-TrFE) thin top layer as well as the side walls. We attribute the enhancement of piezoelectric effects to the contributions from the shell component and the strain confinement effect, which was supported by our modeling results. We envision that these organic-based P(VDF-TrFE) core-shell structures will be used widely as 3D sensors and power generators because they are optimized for current generations by utilizing all surface areas, including the side walls of core-shell structures.
聚偏氟乙烯（PVDF）和聚（偏氟乙烯-三氟乙烯）（P(VDF-TrFE)）的纳米和微米结构因其在包括传感器、致动器、生命体征传感器和能量收集器等多个领域的潜在应用而被广泛使用。在本研究中，我们使用高模量聚氨酯丙烯酸酯（PUA）柱作为支撑结构来开发垂直排列的P(VDF-TrFE)核壳结构，以保持结构完整性。此外，与薄膜对应物相比，通过有效利用P(VDF-TrFE)薄顶层以及侧壁，我们能够将压电效应从40±2 pm/V提高1.85倍至74±2 pm/V，这有助于在给定应力下更有效地产生电流。我们将压电效应的增强归因于壳层成分的贡献和应变限制效应，这得到了我们建模结果的支持。我们设想这些基于有机的P(VDF-TrFE)核壳结构将被广泛用作3D传感器和发电机，因为它们通过利用包括核壳结构侧壁在内的所有表面积，针对当前发电进行了优化。
