One-step molten-salt synthesis of BaTi4O9 nanowires with oxygen deficiency-enhanced dielectric performance

Abstract

One-dimensional nanostructures of BaO-xTiO 2 binary oxides with a high oxygen deficiency and a good dielectric performance are of great interest but seldom studied. In the present study, single-crystalline BaTi 4 O 9 (stoichiometric BaO-4TiO 2 ) nanowires were synthesized using a simple, one-step molten-salt method by co-heating the powder mixtures of NaCl, TiO 2 and BaCl 2 nanoparticles at 750 uC. A series of spontaneous processes in the molten NaCl/BaCl 2 salt mixture with the dispersed TiO 2 nanoparticles, including ion diffusion, chemical reaction, particle agglomeration and ion exchange, yielded the BaTi 4 O 9 nanowires. Photoelectron spectroscopic and dielectric analyses indicated that a high fraction of oxygen deficiency for 10.4% provided the as-synthesized BaTi 4 O 9 nanowires with a high capacitance density of 13 F/m 2 . Thermal annealing lowered the oxygen deficiency to 6.6% and the capacitance density to 9 F/m 2 .The increase in wire length increased the oxygen deficiency and dielectric constant of the nanowires.

CuO Quantum Dots Decorated TiO2 Nanocomposite Photocatalyst for Stable Hydrogen Generation

“…Diffraction peaks of Cu were absent in CuT materials. This may be due to a relatively low concentration of Cu, small crystallite sizes, or the amorphous nature of CuO . The presence of Cu was confirmed by using XPS analysis and HR-TEM data ( vide infra ).…”

“…This may be due to a relatively low concentration of Cu, small crystallite sizes, or the amorphous nature of CuO. 41 The presence of Cu was confirmed by using XPS analysis and HR-TEM data (vide inf ra). With increasing Cu content, no change in the TiO 2 phase was observed which indicates that support material TiO 2 scarcely undergoes phase transformation during synthesis.…”

Generation of oxygen vacancies in visible light activated one-dimensional iodine TiO2 photocatalysts

“…The two main O 1s peaks are attributed to O 2À (528.2 eV-529.5 eV) and oxygen vacancies, O* (531.1-533.5 eV). 36 Deconvolution of the peaks reveals that the number of oxygen vacancies (O* in TiO 2Àx around 531.1 eV-533.5 eV) increases as the hydrothermal temperature increases (Table 1).…”

Augmented Z scheme blueprint for efficient solar water splitting system using quaternary chalcogenide absorber material

“…1 Other materials such as BiVO 4 , WO 3 , SrTiO 3 : Rh have also been utilized in the visible spectrum. [4][5][6] Various d 10 and d 0 class type photocatalysts 1,[7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] have been utilized for water splitting. Although various novel materials show promising results, none of them can maintain 1000 hours of stability in typical solutions under solar illumination conditions.…”