Nanoparticles and 3D sponge-like porous networks of manganese oxides and their microwave absorption properties
- 17 February 2009
- journal article
- Published by IOP Publishing in Nanotechnology
- Vol. 20 (10), 105706
- https://doi.org/10.1088/0957-4484/20/10/105706
Abstract
Hydrohausmannite nanoparticles (approximately 10 nm) were prepared by the hydrothermal method at 100 degrees C for 72 h. Subsequent annealing was done in air at 400 degrees C and 800 degrees C for 10 h, Mn(3)O(4) nanoparticles (approximately 25 nm) and 3D Mn(2)O(3) porous networks were obtained, respectively. The products were characterized by XRD, TEM, SAED and FESEM. Time-dependent experiments were carried out to exhibit the formation process of the Mn(2)O(3) networks. Their microwave absorption properties were investigated by mixing the product and paraffin wax with 50 vol%. The Mn(3)O(4) nanoparticles possess excellent microwave absorbing properties with the minimum reflection loss of -27.1 dB at 3.1 GHz. In contrast, the Mn(2)O(3) networks show the weakest absorption of all samples. The absorption becomes weaker with the annealing time increasing at 800 degrees C. The attenuation of microwave can be attributed to dielectric loss and their absorption mechanism was discussed in detail.This publication has 43 references indexed in Scilit:
- Microwave absorption properties and the isotropic antenna mechanism of ZnO nanotreesJournal of Applied Physics, 2008
- Morphology-controlled synthesis, growth mechanism, optical and microwave absorption properties of ZnO nanocombsJournal of Physics D: Applied Physics, 2008
- Multistep Synthesis, Growth Mechanism, Optical, and Microwave Absorption Properties of ZnO Dendritic NanostructuresThe Journal of Physical Chemistry C, 2008
- Microwave absorption properties and mechanism of cagelike ZnO∕SiO2 nanocompositesApplied Physics Letters, 2007
- Microwave Absorption of Single-Walled Carbon Nanotubes/Soluble Cross-Linked Polyurethane CompositesThe Journal of Physical Chemistry C, 2007
- Electron energy-loss spectroscopy characterization and microwave absorption of iron-filled carbon-nitrogen nanotubesNanotechnology, 2007
- Electromagnetic and microwave absorbing properties of multi-walled carbon nanotubes/polymer compositesMaterials Science and Engineering B, 2006
- Electromagnetic Interference (EMI) Shielding of Single-Walled Carbon Nanotube Epoxy CompositesNano Letters, 2006
- Microwave Absorption Enhancement and Complex Permittivity and Permeability of Fe Encapsulated within Carbon NanotubesAdvanced Materials, 2004
- Microwave Absorbing MaterialsInorganic Materials, 2001