Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 116, Issue 4, Pages 1779-1783Publisher
SPRINGER
DOI: 10.1007/s00339-014-8327-1
Keywords
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Funding
- 973 Project [2013CB934001]
- NSF of China [51172024, 51372022, 51302011]
- China PSF [2012M520165]
- Fundamental Research Funds for the Central Universities [FRF-TP-13-036A]
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As the development of electronic and communication technology, electromagnetic interference (EMI) shielding and attenuation is an effective strategy to ensure the operation of the electronic devices. Among the materials for high-performance shielding in aerospace industry and related high-temperature working environment, the thermally stable metal oxide semiconductors with narrow band gap are promising candidates. In this work, beta-manganese dioxide (beta-MnO2) nanorods were synthesized by a hydrothermal method. The bulk materials of the beta-MnO2 were fabricated to evaluate the EMI shielding performance in the temperature range of 20-500 A degrees C between 8.2 and 12.4 GHz (X-band). To understand the mechanisms of high-temperature EMI shielding, the contribution of reflection and absorption to EMI shielding was discussed based on temperature-dependent electrical properties and complex permittivity. Highly sufficient shielding effectiveness greater than 20 dB was observed over all the investigated range, suggesting beta-MnO2 nanorods as promising candidates for high-temperature EMI shielding. The results have also established a platform to develop high-temperature EMI shielding materials based on nanoscale semiconductors.
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