Recent Development in Fabrication of Co Nanostructures and Their Carbon Nanocomposites for Electromagnetic Wave Absorption

Nannan Wu,1, *

Wenjing Du,2

Qian Hu,3, *

Sravanthi Vupputuri,3

Qinglong Jiang4, *

1Department of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 250061, China

2School of science, Henan Key Laboratory of Electronic Ceramics Materials and Application, Henan University of Engineering, Zhengzhou, 451191, China

3Department of Chemical & Biomolecular Engineering, University of Tennessee, 1512 Middle Drive, Knoxville, Tennessee 37996, USA

4Department of Chemistry and Physics, University of Arkansas, Pine Bluff, Arkansas 71601, USA

Abstract

In recent years, Electromagnetic wave (EMW) absorption materials have received great interests owing to their ability of addressing the increased EM radiation (EMR) and interference (EMI) problems. With the advantages of high magnification saturation and large permeability in GHz range, cobalt materials have been considered as promising EM absorbers. This article introduces the development of pure Co materials with different micro-structures and Co/C composites as EM wave absorption materials. The effects of various microstructures, filling ratios, and graphitization degree on the EM wave absorption properties were thoroughly discussed. Through comparisons of different types of Co based absorbers, the combination of Co and porous carbon can be an effective method and main direction to reach the requirements of ideal EMW absorption materials with strong absorption, low thickness, broad absorption bandwidth and low density.

Recent Development in Fabrication of Co Nanostructures and Their Carbon Nanocomposites for Electromagnetic Wave Absorption