MOF-Derived Porous Co/C Nanocomposites with Excellent Electromagnetic Wave Absorption Properties

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• 作者：Yinyun L眉 ; Yiting Wang ; Hongli Li ; Yuan Lin ; Zhiyuan Jiang ; Zhaoxiong Xie ; Qin Kuang ; Lansun Zheng
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：June 24, 2015
• 年：2015
• 卷：7
• 期：24
• 页码：13604-13611
• 全文大小：485K
• ISSN：1944-8252

文摘

Composites incorporating ferromagnetic metal nanopartices into a highly porous carbon matrix are promising as electromagnetic wave absorption materials. Such special composite nanomaterials are potentially prepared by the thermal decomposition of metal鈥搊rganic framework (MOF) materials under controlled atmospheres. In this study, using Co-based MOFs (Co-MOF, ZIF-67) as an example, the feasibility of this synthetic strategy was demonstrated by the successful fabrication of porous Co/C composite nanomaterials. The atmosphere and temperature for the thermal decomposition of MOF precursors were crucial factors for the formation of the ferromagnetic metal nanopartices and carbon matrix in the porous Co/C composites. Among the three Co/C composites obtained at different temperatures, Co/C-500 obtained at 500 掳C exhibited the best performance for electromagnetic wave absorption. In particular, the maximum reflection loss (RL) of Co/C-500 reached 鈭?5.3 dB, and the effective absorption bandwidth (RL 鈮?鈭?0 dB) was 5.80 GHz (8.40 GHz鈥?4.20 GHz) corresponding to an absorber thickness of 2.5 mm. Such excellent electromagnetic wave absorption properties are ascribed to the synergetic effects between the highly porous structure and multiple components, which significantly improved impedance matching.