Efficient and Lightweight Electromagnetic Wave Absorber Derived from Metal Organic Framework-Encapsulated Cobalt Nanoparticles

被引：265

作者：

Wang, Haicheng ^{[1
]}

Xiang, Long ^{[1
]}

Wei, Wei ^{[1
]}

An, Jing ^{[2
]}

He, Jun ^{[2
]}

Gong, Chunhong ^{[3
]}

Hou, Yanglong ^{[4
]}

机构：

[1] Univ Sci & Technol Beijing, Natl Ctr Mat Serv Safety, Beijing 100083, Peoples R China

[2] Cent Iron & Steel Res Inst, Inst Funct Mat, Beijing 100081, Peoples R China

[3] Henan Univ, Coll Chem & Chem Engn, Kaifeng 475004, Henan, Peoples R China

[4] Peking Univ, Coll Engn, Dept Mat Sci & Engn, BKLMMD,BIC EAST, Beijing 100871, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2017年 / 9卷 / 48期

基金：

中国国家自然科学基金;

关键词：

nanoparticles; metal organic frameworks; electromagnetic wave absorber; lightweight; impedance matching; MICROWAVE-ABSORPTION PROPERTIES; CARBON NANOTUBES; NANOCOMPOSITES; COMPOSITES; MICROSPHERES; FABRICATION; STABILITY; NANOCUBES; NANORODS; DESIGN;

D O I：

10.1021/acsami.7b13796

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Porous-carbon-based nanocomposites are gaining tremendous interest because of good compatibility, lightweight, and strong electromagnetic wave absorption. However, it is still a great challenge to design and synthesize porous-carbon-based composites with strong absorption capability and broad frequency bandwidth. Herein, a facile and effective method was developed to synthesize Co magnetic nanoparticles/metal organic framework (MOF) (Co NPs/ZIF-67) nanocomposites. Co NPs/porous C composites were subsequently obtained by annealing Co NPs/ZIF-67 nano composites at different temperatures under an inert atmosphere. The carbonized nanocomposites showed highly efficient electromagnetic wave absorption capability. Specifically, the optimal composite (i.e., Co/C-700) possessed a maximum reflection loss (RL) value of -30.31 dB at 11.03 GHz with an effective absorption bandwidth (RL <= -10 dB) of 4.93 GHz. The electromagnetic parameters and the absorption performance of the composites are readily tunable by adjusting the carbonization temperature and the concentration of Co NPs in the composites. Because of the combination of good impedance matching, dual loss mechanism, and the synergistic effect between Co NPs and porous carbon composites, these Co NPs/MOF-derived composites are attractive candidates for electromagnetic wave absorbers.

引用

页码：42102 / 42110

页数：9

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