Research & Development Institute in Shenzhen, Northwestern Polytechnical University, Xi'an 710072, PR China; MOE Key Laboratory of Material Physics and Chemistry under Extrodinary Conditions, School of Science, Northwestern Polytechnical University, Xi'an 710072, PR China.
Research & Development Institute in Shenzhen, Northwestern Polytechnical University, Xi'an 710072, PR China; MOE Key Laboratory of Material Physics and Chemistry under Extrodinary Conditions, School of Science, Northwestern Polytechnical University, Xi'an 710072, PR China.
J Colloid Interface Sci. 2019 Mar 22;540:218-227. doi: 10.1016/j.jcis.2019.01.025. Epub 2019 Jan 8.
Unique covalently bonded cobalt ferrite (CoFeO)/graphene nanocomposites are successfully fabricated via an amino-ester-amide reaction process. The morphology, component, functional groups and electromagnetic properties are detected by Transmission Electron Microscope (TEM), Scanning Electron Microscope (SEM), X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectra (FTIR), Vibrating Sample Magnetometer (VSM) and Vector Network Analyzer (VNA). Compared to non-covalently bonded nanocomposites, the covalently bonded CoFeO/graphene nanocomposites have outstanding electromagnetic wave absorption properties. We found that the maximum reflection loss value reached at -55.2 dB and the absorption bandwidth with reflection loss below -10 dB was about 5.4 GHz at 1.7 mm of thickness. The efficiency is attributed to the introduction of amide bonds in the nanocomposites. As a stable carrier channel, amide bonds can promote the migration rate of electrons and binding degree between CoFeO and graphene nanosheets, which provide a crucial impact on electromagnetic parameters and polarization modes of materials, thus improving the absorption capacity of electromagnetic waves. It can be inferred that the nanocomposites have a broad application prospect in the field of electronic instruments, aerospace, military radars and national defense security fields.
通过氨基酯酰胺反应过程，成功制备了独特的共价键合钴铁氧体（CoFeO）/石墨烯纳米复合材料。通过透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X 射线光电子能谱（XPS）、傅里叶变换红外光谱（FTIR）、振动样品磁强计（VSM）和矢量网络分析仪（VNA）检测形貌、成分、官能团和电磁性能。与非共价键合纳米复合材料相比，共价键合 CoFeO/石墨烯纳米复合材料具有出色的电磁波吸收性能。我们发现，在 1.7 毫米厚度下，最大反射损耗值达到-55.2 dB，反射损耗低于-10 dB 的吸收带宽约为 5.4 GHz。这种效率归因于纳米复合材料中酰胺键的引入。作为稳定的载体通道，酰胺键可以促进 CoFeO 和石墨烯纳米片之间电子的迁移率和结合程度，这对材料的电磁参数和极化模式产生了至关重要的影响，从而提高了电磁波的吸收能力。可以推断，该纳米复合材料在电子仪器、航空航天、军事雷达和国防安全领域具有广阔的应用前景。
