Flexible and Robust Piezoelectric Polymer Nanocomposites Based Energy Harvesters,ACS Applied Materials & Interfaces

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Flexible and Robust Piezoelectric Polymer Nanocomposites Based Energy Harvesters
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-01-12 00:00:00 , DOI: 10.1021/acsami.7b16973
Deepa Singh _{1,

2} , Aditya Choudhary ₁ , Ashish Garg ₁

Affiliation

Environment friendly, flexible, and robust sensors have attracted considerable research attention due to their potential for a wide range of devices in energy generation and harvesting, sensing, and biomedical applications. In this manuscript, we demonstrate a lead-free, solution processed flexible piezoelectric energy generator based on a nanocomposite film, consisting of MgO nanoparticles of sizes around <50 nm, embedded in poly(vinylidene difluoride) [PVDF] and its copolymer with trifluoroethylene, that is, P(VDF-TrFE) matrix. Piezoelectric, ferroelectric, and leakage current measurements made on samples with various concentrations of MgO nanoparticles revealed a dramatic improvement in these characteristics at 2 wt % MgO with nearly 50% increase in the piezoelectric coefficient as compared to pure P(VDF-TrFE), attributed to the preferred conformation of P(VDF-TrFE) chain, improved crystallinity of the P(VDF-TrFE) matrix, and uniform distribution of nanoparticles. Assessment of the interactions between −OH groups attached to MgO surface and P(VDF-TrFE), carried out using Fourier-transform infrared spectroscopy (FTIR), suggested weak van der Waals forces between −OH groups and P(VDF-TrFE) being responsible for the observed improvement. This flexible nanocomposite device exhibits superior energy harvesting performance with over two-times improvement in the voltage output (2 V) compared to device using P(VDF-TrFE) films alone. Along with superior electrical properties, nanocomposites also exhibit excellent endurance against electrical as well as mechanical fatigue, with piezoelectric coefficient remaining unchanged even after 10 000 bending cycles, supporting their suitability in flexible energy harvesting applications.

中文翻译：

灵活而坚固的压电聚合物纳米复合材料能量收集器

环保，灵活和坚固的传感器因其在能量产生和收集，传感和生物医学应用中的广泛设备潜力而吸引了相当多的研究关注。在本手稿中，我们演示了一种无铅，溶液处理的柔性压电能量发生器，该发生器基于纳米复合膜，该膜由尺寸小于50 nm的MgO纳米颗粒组成，嵌在聚偏二氟乙烯[PVDF]中及其与三氟乙烯的共聚物中，即P（VDF-TrFE）矩阵。与纯P（VDF-TrFE）相比，对具有各种浓度的MgO纳米粒子的样品进行的压电，铁电和泄漏电流测量显示，在2 wt％的MgO下，这些特性有了显着改善，压电系数增加了近50％，这归因于P（VDF-TrFE）链的优选构象，P（VDF-TrFE）基质的结晶度提高以及纳米颗粒的均匀分布。使用傅里叶变换红外光谱（FTIR）对附着在MgO表面的-OH基团与P（VDF-TrFE）之间的相互作用进行评估，表明-OH基团与P（VDF-TrFE）之间的范德华力较弱对观察到的改善负责。与仅使用P（VDF-TrFE）薄膜的设备相比，这种灵活的纳米复合材料设备具有出色的能量收集性能，并且在电压输出（2 V）方面提高了两倍以上。纳米复合材料不仅具有出色的电性能，而且还具有出色的抗电疲劳性和机械疲劳性，即使经过1万次弯曲循环后，压电系数也保持不变，

更新日期：2018-01-12

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