镍锌铁氧体原位包覆MXenes复合材料的制备及吸波机理研究

项目名称： 镍锌铁氧体原位包覆MXenes复合材料的制备及吸波机理研究

项目编号： No.51502310

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无机非金属材料学科

项目作者： 周小兵

作者单位： 中国科学院宁波材料技术与工程研究所

项目金额： 21万元

中文摘要： 本项目根据结构与功能一体化的材料设计理念，利用二维过渡金属碳化物MXenes天然独特的多层纳米片状结构，构建电磁波“迷宫”，发展出Ferrite原位包覆MXenes这一新型吸波材料。采用双亲阴离子型表面活性剂木质素磺酸钠功能化MXenes表面，制备高体积浓度稳定分散的MXenes水溶液，并通过共沉淀水热法实现纳米镍锌铁氧体对MXenes的原位包覆，合成出Ferrite-MXenes复合材料。利用XRD、SEM、HTEM、EDS等手段分析Ferrite和MXenes界面的物相和显微结构特征，并采用洛伦兹电镜技术和电子全息技术，在微纳尺度下原位观察MXenes和缺陷结构（空位与晶界）对镍锌铁氧体磁畴翻转钉扎的影响，建立显微结构、磁畴结构与宏观电磁性能之间的构效关系，从而揭示该类新型材料电磁性能变化的微观结构诱因及吸波机理，为拓展其在吸波材料领域的应用提供实验和理论依据。

中文关键词： 二维过渡金属碳化物；铁氧体；吸波机理；磁畴结构；电磁性能

英文摘要： According to the design concept of structure and function integration material, the electromagnetic wave “maze” will be established by the two-dimensional transition metal carbides (MXenes), which has the unique nano-multilayer structure in naturally, and then we develop a new microwave absorber materials of ferrite in situ coated MXenes hybrids. In the project, MXenes will be functionalized by the lignin sulfonic acid sodium salt. The ferrite-MXenes composites will be prepared by in situ chemical precipitation and hydrothermal processing. The crystal structure and microscopy structure of the composites will be investigate by XRD、SEM、HTEM and EDS, et al. Domain structure and domain wall motion in the composites with applied fields will be observed by in situ observations with Lorentz microscopy and electron holography, and we will investigate the influence of second phase (MXenes) and defect (grain boundary and pore) on the distribution of magnetic moments, and on the dynamical motion of domain wall of the composites during the magnetic reversal. The complex permeability, complex permittivity, hysteresis loops and temperature dependence of electrical conductivity of the composites will be comprehensive evaluated. We will focus on building the relationship between the microstructure and macroscopic electromagnetic performance, and reveal the electromagnetic loss mechanism of the ternary composites. After that, the investigation of electromagnetic loss mechanism and impedance matching law from materials microstructure designation will provide theoretical and experimental supports for the development of microwave absorber.

英文关键词： MXenes;Ferrite;Electromagnetic interference shielding mechanism;Domain structure;electromagnetic properties