Structure study of single crystal BaTiO3 nanotube arrays produced by the hydrothermal method.
High aspect ratio BaTiO(3) nanotube arrays with single crystal structure were fabricated by the hydrothermal method at low temperature (150 degrees C). Numerous structure study methods, including x-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), electron paramagnetic resonance (EPR), and x-ray photoelectron spectroscopy (XPS), were used to investigate the structure of single crystal BaTiO(3) nanotube arrays. TEM observation shows that BaTiO(3) nanotubes have identical crystallographic orientation through their growth directions. EPR and XPS studies show that the obtained BaTiO(3) nanotubes contain perceptible oxygen vacancies. Those oxygen vacancies are responsible for the observed green emission band at 545 nm (2.27 eV) detected by photoluminescence study.
Yang
Yang
Y
State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
Wang
Xiaohui
X
Sun
Changku
C
Li
Longtu
L
D017609:Barium Compounds / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D006358:Hot Temperature; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
D017609:Barium Compounds; D046911:Macromolecular Substances; D014867:Water; C024547:barium titanate(IV); D014025:Titanium