期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 130, 期 3, 页码 1191-1194出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2011.08.056
关键词
Nanostructures; Oxides; Epitaxial growth; Dielectric properties; Scanning electron microscopy
资金
- National Science Foundation of China [61006001, 60536010]
A low-temperature hydrothermal method was developed to synthesize urchinlike gamma-MnO2 nanostructures. Time-dependent evolutions of morphology and crystallinity were investigated to explore the growth mechanism of the gamma-MnO2 urchins. The results show that the growth process of the gamma-MnO2 urchins occurs in two main stages, which are the generation of gamma-MnO2 microspheres and the following epitaxial growth of gamma-MnO2 nanoneedles on the surface of the initial microspheres. Microwave absorption properties of the urchinlike gamma-MnO2 nanostructures were studied in terms of complex permittivity and permeability. An effective absorption bandwidth (reflection loss lower than -10 dB) of 8.8 GHz was achieved from the gamma-MnO2/paraffin wax composite. (C) 2011 Elsevier B.V. All rights reserved.
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