期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 113, 期 23, 页码 10061-10064出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp902296z
关键词
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资金
- National Natural Science Foundation of China [50772025, 50872159]
- Ministry of Science and Technology of China [2008DFR20420]
- China Postdoctoral Science Foundation [20060400042, 200801044]
- Natural Science Foundation of Heilongjiang Province, China [F200828, E200939]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20070217002]
- Innovation Foundation of Harbin City [RC2006QN017016]
Porous Fe3O4/SnO2 core/shell nanorods are successfully fabricated, in which the width and the length of the pores are 5-10 and 10-60 nm, respectively. We prepared 80 wt % of porous Fe3O4/SnO2 core/shell nanorod-wax composites in order to measure their electromagnetic parameters. The measured results indicate that effective complementarities between the dielectric loss and the magnetic loss are realized over 2-18 GHz frequency range, suggesting the porous Fe3O4/SnO2 core/shell nanorods have excellent electromagnetic wave absorption properties. The reflection loss was calculated in terms of the transmit-line theory. The absorption range under -20 dB is from 3.2 to 16.88 GHz for an absorber thickness of 2-5 mm. Moreover, the porous core/shell nanorods exhibit dual-frequency absorption characteristics and their maximum reflection loss reaches -27.38 dB at 16.72 GHz as the absorber thickness is 4 mm. The excellent microwave absorption properties of the porous Fe3O4/SnO2 core/shell nanorods are attributed to effective complementarities between the dielectric loss and the magnetic loss and the special core-shell structures.
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