Enhanced absorption properties of ordered mesoporous carbon/Co-doped ordered mesoporous carbon double-layer absorbers

• Published in: Chinese physics B 2013-04, Vol.22 (4), p.237-242
• Main Author: 郭绍丽 王六定 王一明 吴宏景 沈中元
• Format: Article
• Language: English
• Subjects: Absorption; Bandwidth; Carbon; Impedance; Matching; Mathematical analysis; Noise levels; OMC; Reflection; 吸收剂; 吸收性能; 吸收特性; 有序介孔; 碳; 金属掺杂
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/22/4/044101

Ordered mesoporous carbon （OMC） and metal-doped （M-doped） OMC composites are prepared, and their electromagnetic （EM） parameters are measured. Using the measured EM parameters we calculate the EM wave absorption properties of a double-layer absorber, which is composed of OMC as an absorbing layer and M-doped OMC as the matching layer. The calculated results show that the EM wave absorption performance of OMC/OMC–Co （2.2mm/2.1mm） is improved remarkably. The obtained effective absorption bandwidth is up to 10.3 GHz and the minimum reflection loss reaches 47.6 dB at 14.3 GHz. The enhanced absorption property of OMC/OMC–Co can be attributed to the impedance match between the air and the absorber. Moreover, it can be found that for the absorber with a given matching layer, a larger value of -tanδ ε （= tan δ ε absorbing tan δε matching ） can induce better absorption performance, indicating that the difference in impedance between the absorbing layer and the matching layer plays an important role in improving the absorption property of double-layer absorbers.