Zinc oxide/nanoporous carbon hybrid materials derived from metal-organic frameworks with different dielectric and absorption performances
Zinc oxide/nanoporous carbon hybrid materials derived from metal-organic frameworks with different dielectric and absorption performances
复制标题
具有不同介电和吸收性能的金属有机骨架衍生的氧化锌/纳米孔碳杂化材料
DOI：
10.1039/c9qi00648f
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发表时间：
2019
影响因子：
7
通讯作者：
Ji Guangbin
中科院分区：
文献类型：
--
作者：
Liang Xiaohui;Xu Xin;Man Zengming;Quan Bin;Sun Bowen;Chen Jiabin;Gu Weihua;Ji Guangbin
以ZIF-8沸石为骨架材料，通过自模板法制备了不同结构的ZnO/纳米多孔碳（NPC）复合材料。因此，通过煅烧过程获得了一系列具有不同介电特性的样品。有趣的是，在碳化过程中的退火温度起着关键作用的阻抗匹配和介电弛豫的最终产品组成的ZnO，NPC和纳米孔。加热温度会影响石墨化程度和介电性能。因此，在1.55 mm处可实现−25 dB的最大反射损耗。总之，本研究证实了加热温度对金属-有机骨架材料的介电性能和阻抗匹配性能有重要影响，并有望推广到其他高效吸波材料的设计中。
Different kinds of hetero-structured ZnO/nanoporous carbon (NPC) composites with enhanced microwave absorption properties have been designed through a self-templated route by using zeolitic imidazolate framework (ZIF-8) as raw material. Thus, a series of samples with different dielectric features were obtained via calcination processes. Interestingly, the annealing temperatures during the carbonization procedures play a key role in the impedance matching and the dielectric relaxations for the final products composed of ZnO, NPC and nanopores. The heating temperatures could influence the degree of graphitization and the dielectric features. As a result, a maximum reflection loss of −25 dB with 1.55 mm can be achieved. In a word, this study confirms that the heating temperatures have important influences on dielectric as well as impedance matching for metal–organic frameworks, which is expected to be expanded to the design of many other efficient microwave absorbing materials.