Martins P, Larrea A, Gonçalves R, Botelho G, Ramana E V, Mendiratta S K, Sebastian V, Lanceros-Mendez S
†Centro/Departamento de Física, Universidade do Minho, 4710-057 Braga, Portugal.
‡Department of Chemical Engineering. Aragon Institute of Nanoscience (INA), University of Zaragoza, Campus Río Ebro-Edificio I+D, C/Poeta Mariano Esquillor S/N, 50018 Zaragoza, Spain.
ACS Appl Mater Interfaces. 2015 Jun 3;7(21):11224-9. doi: 10.1021/acsami.5b01196. Epub 2015 May 19.
The past decade has witnessed increased research effort on multiphase magnetoelectric (ME) composites. In this scope, this paper presents the application of novel materials for the development of anisotropic magnetoelectric sensors based on δ-FeO(OH)/P(VDF-TrFE) composites. The composite is able to precisely determine the amplitude and direction of the magnetic field. A new ME effect is reported in this study, as it emerges from the magnetic rotation of the δ-FeO(OH) nanosheets inside the piezoelectric P(VDF-TrFE) polymer matrix. δ-FeO(OH)/P(VDF-TrFE) composites with 1, 5, 10, and 20 δ-FeO(OH) filler weight percentage in three δ-FeO(OH) alignment states (random, transversal, and longitudinal) have been developed. Results have shown that the modulus of the piezoelectric response (10-24 pC·N(-1)) is stable at least up to three months, the shape and magnetization maximum value (3 emu·g(-1)) is dependent on δ-FeO(OH) content, and the obtained ME voltage coefficient, with a maximum of ∼0.4 mV·cm(-1)·Oe(-1), is dependent on the incident magnetic field direction and intensity. In this way, the produced materials are suitable for innovative anisotropic sensor and actuator applications.
在过去十年中，对多相磁电（ME）复合材料的研究力度不断加大。在此范围内，本文介绍了新型材料在基于δ-FeO(OH)/P(VDF-TrFE)复合材料的各向异性磁电传感器开发中的应用。该复合材料能够精确确定磁场的幅度和方向。本研究报告了一种新的磁电效应，它源于δ-FeO(OH)纳米片在压电P(VDF-TrFE)聚合物基质中的磁旋转。已开发出在三种δ-FeO(OH)排列状态（随机、横向和纵向）下填充重量百分比分别为1%、5%、10%和20%的δ-FeO(OH)/P(VDF-TrFE)复合材料。结果表明，压电响应模量（10-24 pC·N(-1)）至少在三个月内保持稳定，形状和磁化最大值（3 emu·g(-1)）取决于δ-FeO(OH)含量，所获得的磁电电压系数最大值约为0.4 mV·cm(-1)·Oe(-1)，取决于入射磁场方向和强度。通过这种方式，所生产的材料适用于创新的各向异性传感器和致动器应用。
