| 학회 |
한국재료학회 |
| 학술대회 |
2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 |
22권 2호 |
| 발표분야 |
A. 전자/반도체 재료 분과 |
| 제목 |
Porous Fe3O4 Nanoparticles for Electromagnetic Interference Applications |
| 초록 |
Magnetite (Fe3O4) porous nanoparticles composed of primary nanocrystals have been synthesized by one-pot solvothermal method with gas-bubble assisted Ostwald ripening process. In order to understand the formation mechanism, the reaction parameters such as the concentration of precipitating agent, capping agent (PVP), and gas source were investigated by fixing the reaction temperature and time. The characterization of the as prepared product was identified with field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and N2 adsorption-desorption technique. The results indicate that the primary spherical nanocrystals size was controllable by regulating the urea concentration. We found that urea plays an important role to control primary spherical nanocrystals size and the porosity of the Fe3O4 nanospheres. For further application, these nanospheres were mixing with paraffin wax and studied their electromagnetic properties. The electromagnetic properties measurements, high porous magnetite spheres showed the maximum reflection loss (RL). A maximum reflection loss (RL) of the highly porous spheres can reach -48.9 dB at 11.9 GHz with a thickness of 2.7 mm due to the increased dielectric loss caused by the higher interfacial polarization relaxation loss of the porous structure.
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| 저자 |
Rambabu Kuchi1, Viet Dongquoc2, Jong-Ryul Jeong1
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| 소속 |
1Department of Materials Science and Engineering, 2Chungnam National Univ. |
| 키워드 |
Porous Fe3O4 nanoparticles; Solvothermal method; Porosity; Reflection loss; Dielectric loss
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| E-Mail |
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