Functionality Tuning in Hierarchically Engineered Magnetoelectric Nanocomposites for Energy-Harvesting Applications.
Functionality Tuning in Hierarchically Engineered Magnetoelectric Nanocomposites for Energy-Harvesting Applications.
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DOI：
10.1021/acsami.3c01435
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发表时间：
2023-05
影响因子：
9.5
通讯作者：
Shashikant Gupta;C. Chatterjee;Bushara Fatma;Kumar Brajesh;R. Bhunia;N. Sowmya;Soumyabrata Roy
中科院分区：
文献类型：
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作者：
Shashikant Gupta;C. Chatterjee;Bushara Fatma;Kumar Brajesh;R. Bhunia;N. Sowmya;Soumyabrata Roy
聚偏氟乙烯-三氟乙烯共聚物P（VDF-TrFE）的β相在所有功能聚合物中具有最高的偶极矩。在过去十年中，它仍然是基于压电和摩擦电的灵活能量收集设备的关键部件。然而，寻求P（VDF-TrFE）为基础的磁电（ME）纳米复合材料具有增强的铁电，压电和摩擦电性能仍然难以捉摸。共聚物基体中的磁致伸缩夹杂物形成导电通路并显著降低β相结晶度，从而劣化纳米复合膜的功能性质。为了解决这个问题，我们报告的磁铁矿（Fe 3 O 4）纳米粒子的微米级氢氧化镁[Mg（OH）2]模板的合成。这些层次结构被纳入P（VDF-TrFE）矩阵渲染复合材料具有增强的能量收集能力。Mg（OH）2模板防止形成磁性填料的连续网络，从而导致复合材料中较低的漏电。添加5wt%的双相填料仅使反射极化（Pr）值增加约44%，这是由于具有显著结晶度和增加的界面极化的β相的存在。该复合膜表现出准超顺磁性质和30 mV/cm Oe的显著磁电耦合系数（αME）。该膜还用于摩擦电纳米发电机应用，表现出比原始膜高5倍的功率密度。我们最终探索将我们的ME设备与物联网平台集成，以远程监控电器的运行状态。鉴于这些发现，目前的工作开辟了未来的自供电，多功能，灵活的ME设备与新的应用领域的路径。
The β-phase of the copolymer poly(vinylidene fluoride-trifluoroethylene) P(VDF-TrFE) possesses the highest dipole moment among all the functional polymers. It remains a key component of flexible energy-harvesting devices based on piezoelectricity and triboelectricity in the last decade. However, the quest for P(VDF-TrFE)-based magnetoelectric (ME) nanocomposites with enhanced ferroelectric, piezoelectric, and triboelectric properties remains elusive. The magnetostrictive inclusion in the copolymer matrix forms electrically conducting pathways and degrades β-phase crystallinity significantly, deteriorating the functional properties of the nanocomposite films. To address this issue, we report the synthesis of magnetite (Fe3O4) nanoparticles on micron-scale magnesium hydroxide [Mg(OH)2] templates. These hierarchical structures were incorporated within the P(VDF-TrFE) matrix rendering composites with enhanced energy-harvesting capability. The Mg(OH)2 template prevents the formation of a continuous network of magnetic fillers, leading to lower electrical leakage in the composite. The addition of dual-phase fillers with 5 wt % only increases remanent polarization (Pr) values by ∼44%, owing to the presence of the β-phase with significant crystallinity and increased interfacial polarization. The composite film exhibits a quasi-superparamagnetic nature and a significant magnetoelectric coupling coefficient (αME) of 30 mV/cm Oe. The film was also employed for triboelectric nanogenerator applications, exhibiting five times higher power density than the pristine film. We finally explored the integration of our ME devices with an internet of things platform to monitor the operational status of electrical appliances remotely. In light of these findings, the present work opens the path for future self-powered, multifunctional, and flexible ME devices with new application domains.