Lei Yiming, Yao Zhengjun, Lin Haiyan, Zhou Jintang, Haidry Azhar Ali, Liu Peijiang
College of Materials and Technology, Nanjing University of Aeronautics and Astronautics Nanjing 211100 China
Key Laboratory of Material Preparation and Protection for Harsh Environment (Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology Nanjing 211100 China.
RSC Adv. 2018 Aug 17;8(51):29344-29355. doi: 10.1039/c8ra05500a. eCollection 2018 Aug 14.
This study presents the systematic potential effects of reaction parameters on the synthesis of Co-doped ZnNi ferrite/polyaniline composites prepared novel interfacial polymerization. Through intensive experiments and analysis, optimum reaction conditions including the polymerization temperature and reaction time are proposed so that the performance of the material is significantly improved. The structure, functional groups and morphologies of composites are investigated by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). In addition, the electromagnetic properties and microwave absorption properties of Co-doped ZnNi ferrite/polyaniline composites are examined by a vibrating sample magnetometer (VSM), Quantum Design (MPMS-VSM and MPMS-XL), the superconducting quantum interference device (SQUID) magnetometer and vector network analysis. Based on these analyses, it is found that by tuning the reaction conditions, , polymerization temperature and reaction time, microwave absorption capabilities in terms of the maximum reflection loss ( ) value and absorber thickness can be readily optimized. The results show that the composite with an optimized polymerization condition of 20 °C for 12 h displays remarkable microwave absorption properties with maximum reflectivity of -54.3 dB, and the effective bandwidth ( < -10 dB) is about 6.02 GHz at a thickness of 6.8 mm. Furthermore, the discussion shows that the promising microwave absorption may be due to the uniform urchin-like structure of the composites.
本研究展示了反应参数对通过新型界面聚合法制备的钴掺杂锌镍铁氧体/聚苯胺复合材料合成的系统潜在影响。通过深入的实验和分析，提出了包括聚合温度和反应时间在内的最佳反应条件，从而显著提高了材料的性能。通过X射线光电子能谱（XPS）、X射线衍射（XRD）、傅里叶变换红外（FT-IR）光谱、扫描电子显微镜（SEM）和高分辨率透射电子显微镜（HRTEM）对复合材料的结构、官能团和形态进行了研究。此外，通过振动样品磁强计（VSM）、量子设计（MPMS-VSM和MPMS-XL）、超导量子干涉装置（SQUID）磁强计和矢量网络分析对钴掺杂锌镍铁氧体/聚苯胺复合材料的电磁性能和微波吸收性能进行了检测。基于这些分析，发现通过调整反应条件，即聚合温度和反应时间，可以很容易地优化微波吸收能力，包括最大反射损耗（ ）值和吸收体厚度。结果表明，在20℃下反应12小时的优化聚合条件下制备的复合材料具有显著的微波吸收性能，最大反射率为-54.3 dB，在厚度为6.8 mm时有效带宽（ ＜-10 dB）约为6.02 GHz。此外，讨论表明，这种有前景的微波吸收可能归因于复合材料均匀的海胆状结构。
