Heryanto Heryanto, Siswanto Siswanto, Rahmat Roni, Sulieman Abdelmoneim, Bradley David A, Tahir Dahlang
Department of Physics, Hasanuddin University, Makassar 90245, Indonesia.
Department of Statistics, Hasanuddin University, Makassar 90245, Indonesia.
ACS Omega. 2023 May 18;8(21):18591-18602. doi: 10.1021/acsomega.3c00423. eCollection 2023 May 30.
Efforts to produce microwave absorber materials that are inexpensive and environmentally friendly have become a means of greening the environment. The breakthrough can be focused on industrial waste and natural materials for functional purposes and how to enhance their performance. We successfully synthesized nickel slag/laterite soil (NS/LS) and nickel slag/iron sand (NS/IS) nanocomposites using a simple mechanical alloying technique, and the electromagnetic (EM) wave absorption capacities of the nanocomposites were measured using a vector network analyzer. The structural properties of the nanocomposites were analyzed by X-ray diffraction spectroscopy, where the results of the analysis showed that NS/IS has the largest crystallite size (15.69 nm) and the highest EM wave absorption performance. The optical properties of the nanocomposites were determined from their Fourier transform infrared spectra using the Kramers-Kronig relation. As determined through a quantitative analysis of the optical properties, the distance between the longitudinal and transversal optical phonon wavenumber positions (Δ(LO - TO) = 65 cm) is inversely proportional to the reflection loss. The surface morphologies of the nanocomposites were analyzed by scanning electron microscopy, and the particle diameters were observed by binary image and Gaussian distribution analyses. The nanocomposite surface exhibits a graded-like morphology, which indicates multiple reflections of the EM radiation, consequently reducing the EM interference. The best nanocomposite for an attenuated EM wave achieved a reflection loss of -39.14 dB at 5-8 GHz. A low penetration depth has implications for the electrical charge tuning of the storage and composite magnets. Finally, the EM absorption properties of NS/IS and NS/LS indicate a 2-mm-thick environmentally friendly nanocomposite for EM absorption.
研发价格低廉且环保的微波吸收材料已成为实现环境绿化的一种方式。这一突破可聚焦于将工业废料和天然材料用于功能用途，以及如何提升它们的性能。我们采用简单的机械合金化技术成功合成了镍渣/红土（NS/LS）和镍渣/铁砂（NS/IS）纳米复合材料，并使用矢量网络分析仪测量了这些纳米复合材料的电磁波吸收能力。通过X射线衍射光谱对纳米复合材料的结构特性进行了分析，分析结果表明NS/IS具有最大的微晶尺寸（15.69纳米）和最高的电磁波吸收性能。利用克莱默斯-克勒尼希关系从纳米复合材料的傅里叶变换红外光谱确定其光学性质。通过对光学性质的定量分析确定，纵向和横向光学声子波数位置之间的距离（Δ(LO - TO) = 65厘米）与反射损耗成反比。通过扫描电子显微镜对纳米复合材料的表面形态进行了分析，并通过二值图像和高斯分布分析观察了粒径。纳米复合材料表面呈现出梯度状形态，这表明电磁辐射会发生多次反射，从而减少电磁干扰。用于衰减电磁波的最佳纳米复合材料在5 - 8吉赫兹时实现了-39.14分贝的反射损耗。低穿透深度对存储和复合磁体的电荷调谐有影响。最后，NS/IS和NS/LS的电磁波吸收特性表明了一种用于电磁波吸收的2毫米厚的环保纳米复合材料。
