College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 211100, P. R. China.
Laboratory of Solid State Microstructures, Nanjing University , Nanjing 210093, P. R. China.
ACS Appl Mater Interfaces. 2017 Mar 22;9(11):9964-9974. doi: 10.1021/acsami.6b15788. Epub 2017 Mar 9.
A novel yolk-shell structure of cobalt nanoparticle embedded nanoporous carbon@carbonyl iron (Co/NPC@Void@CI) was synthesized via metal organic chemical vapor deposition (MOCVD) and subsequent calcination treatment. The in situ generation of void layer, which originated from the shrink of a Co-based zeolitic imidazolate framework (ZIF-67) during carbonization, embodies distinct advantage compared to the conventional template method. Thanks to the introduction of custom-designed dielectric/magnetic media heterostructure and multiple interfaces, the composites filled with 40 wt % of Co/NPC@Void@CI samples in paraffin exhibit a maximum reflection loss of -49.2 dB at 2.2 mm; importantly, a broad absorption bandwidth (RL < -10 dB) of 6.72 GHz can be obtained, which covers more than one-third of the whole frequency region from 10.56 to 17.28 GHz. This study not only develops the application of carbonyl iron as a high-efficiency light absorber but also initiates a fire-new avenue for artificially designed heterostructures with target functionalities.
一种新型的蛋黄壳结构的钴纳米粒子嵌入的纳米多孔碳@羰基铁（Co/NPC@Void@CI）通过金属有机化学气相沉积（MOCVD）和随后的煅烧处理合成。原位生成的空隙层，起源于碳化过程中基于 Co 的沸石咪唑酯骨架（ZIF-67）的收缩，与传统的模板方法相比具有明显的优势。由于引入了定制的介电/磁性介质异质结构和多个界面，在石蜡中填充 40wt%Co/NPC@Void@CI 样品的复合材料在 2.2mm 处表现出最大的反射损耗为-49.2dB；重要的是，可以获得 6.72GHz 的宽吸收带宽（RL < -10dB），覆盖了从 10.56GHz 到 17.28GHz 的整个频率区域的三分之一以上。本研究不仅开发了羰基铁作为高效光吸收剂的应用，而且为具有目标功能的人工设计异质结构开辟了一条新途径。
