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β-MnO2/SiO2 Core–Shell Nanorods: Synthesis and Dielectric Properties

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Large-scale β-MnO2/SiO2 core–shell nanorods were synthesized by hydrolysis process. The product was characterized by XRD, EDS, SEM and TEM. The thickness of the SiO2 shell layer is about 3 nm∼5 nm, which can be tuned by changing the amount of tetraethyl orthosilicate (TEOS) and the reaction time. The dielectric properties of the synthesized core–shell nanorods at the temperature range from 373 K to 773 K in X-band were investigated in detail and the mechanism of the dielectric response was discussed. The dielectric loss of the SiO2-coated MnO2 nanorods at 773 K was about twice than that at 373 K. The high dielectric loss is mainly attributed to the interfacial polarization and the electromagnetic impedance match between the SiO2 shell layer and MnO2 core layer. The quantitative formula between the permittivity of β-MnO2/SiO2 core–shell nanorods and the thickness of the SiO2 shell is established, which can be used to tune the dielectric properties of the core–shell nanorods through controlling the thickness of the SiO2 shell layer.
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Keywords: BETA-MNO2/SIO2 CORE-SHELL NANORODS; ELECTROMAGNETIC IMPEDANCE; HIGH-TEMPERATURE DIELECTRIC PROPERTIES; INTERFACIAL POLARIZATION

Document Type: Research Article

Publication date: 2011-08-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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