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Facile Synthesis of BaTiO3 Nanotubes and Their Microwave Absorption Properties

Zhu, Yao-Feng, Zhang, Li, Natsuki, Toshiaki, Fu, Ya-Qin, Ni, Qing-Qing
ACS Applied Materials & Interfaces 2012 v.4 no.4 pp. 2101-2106
Raman spectroscopy, X-ray photoelectron spectroscopy, absorption, ambient temperature, barium titanate, ethanol, nanotubes, paraffin wax, scanning electron microscopy, solvents, transmission electron microscopy
Uniform BaTiO₃ nanotubes were synthesized via a simple wet chemical route at low temperature (50 °C). The as-synthesized BaTiO₃ nanotubes were characterized using powder X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The results show that the BaTiO₃ nanotubes formed a cubic phase with an average diameter of ∼10 nm and wall thickness of 3 nm at room temperature. The composition of the mixed solvent (ethanol and deionized water) was a key factor in the formation of these nanotubes; we discuss possible synthetic mechanisms. The microwave absorption properties of the BaTiO₃ nanotubes were studied at microwave frequencies between 0.5 and 15 GHz. The minimum reflection loss of the BaTiO₃ nanotubes/paraffin wax composite (BaTiO₃ nanotubes weight fraction = 70%) reached 21.8 dB (∼99.99% absorption) at 15 GHz, and the frequency bandwidth less than −10 dB is from 13.3 to 15 GHz. The excellent absorption property of BaTiO₃ nanotubes at high frequency indicates that these nanotubes could be promising microwave-absorbing materials.