NDLI: Microwave absorption enhancement and electron microscopy characterization of BaTiO<sub>3</sub> nano-torus

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhao, Pengfei Gu, Dong Che, Renchao Liu, Jiwei Xia, Feng Zhang, Jie
Copyright Year	2011
Abstract	Uniform BaTiO3 nano-torus with either concave or epicenter holes were synthesized by a hydrothermal method. Experimental observations indicated that the BaTiO3 nano-torus with an average diameter ranging from 50 to 100 nm was of tetragonal phases at room temperature. The morphology of the BaTiO3 nano-torus depends on the shape of the original titanium dioxide precursor and reaction time. The microwave absorption properties of both the BaTiO3 nano-torus and the BaTiO3 solid nanoparticles were examined between 2–18 GHz microwave frequency bands. The maximum reflection loss of the BaTiO3 nano-torus reached −28.38 dB at 11.36 GHz, compared to that of −12.87 dB at 16.32 GHz of the BaTiO3 solid nanoparticles. The nearly 120% enhancement of the reflection loss in the range of 8–12 GHz was probably attributed to the hollow volume inside the BaTiO3 nano-torus which might contribute more dissipation and scattering effects of the microwave. Growth mechanisms of the BaTiO3 nano-torus were also investigated by changing both the reaction time from 0.5 h to 48 h and the reactants concentration ratio between Ba(OH)2·8H2O and titanium dioxide. Both an “in situ transformation” mechanism and a “dissolution-precipitation” growth mode were proposed.
Starting Page	3860
Ending Page	3867
Page Count	8
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	3
Issue Number	9
Journal	Nanoscale
DOI	10.1039/c1nr10606f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hydrothermal synthesis Barium titanate Reflection loss Barium hydroxide Tetragonal crystal system Microwave Titanium dioxide
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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