Facile Synthesis of BaTiO3 Nanotubes and Their Microwave Absorption Properties

摘要

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.