含钴配位聚合物及其衍生物的制备与吸波性能研究

发布时间：2018-03-10 22:44

  本文选题：配位聚合物　切入点：稀土　出处：《沈阳工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着科学技术的飞速发展,电磁波辐射充斥着人们的生活环境,影响着人们的身体健康,吸波材料便逐渐的走进了人们的视野,种类也日益增多。然而到目前为止,含钴配位聚合物及其衍生物应用于吸波材料是非常罕见的。本文通过水热法成功制备出了含钴配位聚合物及其衍生物并对其吸波性能作了研究,具体研究内容如下:(1)通过水热法合成出含钴和稀土的配位聚合物。其中稀土元素分别为:镧、铈、镨、钕、钐、铕、钆、铽。对制备出的含钴和稀土的八种不同的配位聚合物的结构、组成、形貌等方面进行了单晶X射线衍射(S-XRD)、粉末X射线衍射(P-XRD)、扫描电镜(SEM)、EDS、红外光谱(FT-IR)等表征。表征结果表明,制备出的八种含钴和稀土的配位聚合物结构分为两类,其中,含钴和镧的配位聚合物、含钴和铈的配位聚合物、含钴和镨的配位聚合物、含钴和钕的配位聚合物、含钴和钐的配位聚合物以及含钴和铕的配位聚合物均具有崭新的晶体结构。对制备出的八种不同样品的吸波性能分别进行了研究,测试结果表明,制备出的八种不同的含钴和稀土的配位聚合物均具有一定的吸波性能,并且这八种不同的含钴和稀土的配位聚合物的吸波性能均表现出了独特的吸波特性。(2)通过水热法合成出含钴和镝的配位聚合物,并对其在空气中700℃的条件下煅烧4h,从而得到含钴和镝的钙钛矿结构。对含钴和镝的配位聚合物进行改性,得到改性后的产物。再对改性后的样品置于空气中700℃条件下煅烧4个小时,从而得到改性后样品的衍生物。采用单晶X射线衍射(S-XRD)、粉末X射线衍射(P-XRD)、扫描电镜(SEM)、EDS、红外光谱(FT-IR)等对样品的结构形貌进行表征。再对上述四种样品的吸波性能进行研究。值得一提的是,NiO/DyCoO3复合材料(样品4)的吸波性能得到了显著改善,特别是在高频带,当频率为18GHz,厚度为6mm时,反射损耗达到-36.68dB。(3)通过水热法合成出含钴的配位聚合物,通过改变LiOH的投入量得到三种不同的前驱体,再将这三种前驱体在空气中500℃下煅烧4个小时从而得到Co3O4纳米管和纳米片材料。采用粉末X射线衍射(P-XRD)、扫描电镜(SEM)对其结构形貌进行表征。再对这三种Co3O4纳米材料的吸波性能进行研究。测试结果表明多孔Co3O4纳米材料具有优异的吸波性能。这种优异的吸波性能不仅来自介电损耗和阻抗匹配还来自样品的几何效应。
[Abstract]:With the rapid development of science and technology, electromagnetic wave radiation is flooding people's living environment and affecting people's health. Cobalt-containing coordination polymers and their derivatives are rarely used in microwave absorbing materials. In this paper, Co-containing coordination polymers and their derivatives have been successfully prepared by hydrothermal method and their absorbing properties have been studied. The coordination polymers containing cobalt and rare earth are synthesized by hydrothermal method. The rare earth elements are lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, lanthanum, cerium, praseodymium, neodymium, Terbium. The structure, composition and morphology of eight kinds of coordination polymers containing cobalt and rare earth were characterized by single crystal X-ray diffraction (S-XRDX), powder X-ray diffraction (PXRDX), scanning electron microscopy (SEM) SEMMO-EDS, infrared spectroscopy (FTIR), etc. The results show that the structure, composition and morphology of eight kinds of coordination polymers containing cobalt and rare earth are characterized by X-ray diffraction (XRD), X-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (FTIR). Eight kinds of coordination polymers containing cobalt and rare earth have been prepared, including cobalt and lanthanum coordination polymers, cobalt and cerium coordination polymers, cobalt and praseodymium coordination polymers, cobalt and neodymium coordination polymers. Coordination polymers containing cobalt and samarium as well as coordination polymers containing cobalt and europium have new crystal structures. Eight kinds of coordination polymers containing cobalt and rare earth have some absorbing properties. Moreover, these eight kinds of coordination polymers containing cobalt and rare earth show unique microwave absorption properties. The coordination polymers containing cobalt and dysprosium are synthesized by hydrothermal method. The perovskite structure of cobalt and dysprosium was obtained by calcining it at 700 鈩，

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