title: Enhanced microwave absorption performance of hollow alpha-MnO2 nanourchins.
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.
authors: Key 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.
authors: Min
authors: M
authors: Zhou
authors: Xin
authors: X
authors: Zhang
authors: Long
authors: L
authors: Wang
authors: Jumeng
authors: J
authors: Wei
authors: Kangwei
authors: K
authors: Zhu
authors: Boxue
authors: B
authors: Feng