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Published on: May 11, 2017
Enhanced microwave absorption performance of hollow alpha-MnO2 nanourchins
Min Zhou1, Xin Zhang, Long Wang
1Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, and School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China.
Abstract:
Three dimensional (3D) hierarchical nanostructures are expected to provide enhanced microwave absorption properties for nanomaterials. In this report we prepared hollow urchinlike alpha-MnO2 nanostructures and dispersed alpha-MnO2 nanorods via a facile hydrothermal method. The complex permittivity and permeability of the hollow alpha-MnO2 nanourchins/paraffin wax composites with different manganese dioxide loadings were investigated in the range of 2-18 GHz, based on which the corresponding reflection loss were simulated. A minimum reflection loss of -36 dB was obtained from the composites with 50 wt% MnO2 nanostructures. Furthermore, the microwave absorption properties of dispersed alpha-MnO2 nanorods were studied for comparison, which indicate the unique morphology of the hollow urchinlike nanostructures is of significant effect to their microwave absorption properties.
