Journal
NANOTECHNOLOGY
Volume 29, Issue 38, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aacfde
Keywords
CaTiO3 nanotube; hydrothermal method; photovoltage; electrochemical impedance spectroscopy
Funding
- Fundamental Research Funds for the Central Universities [N15026001]
- National Natural Science Foundation of China [U1261120, 51002027]
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development [Y607s31001]
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Perovskite-type oxides have become the hotspots of functional materials due to their various excellent performances. As a typical material with a perovskite structure, CaTiO3 (CTO) possesses a similar band gap to TiO2 with less defects and recombination centers, which makes it a promising alternative material to TiO2. In particular, the CTO nanotube structure has a large specific surface area and unique photochemical and electron-transport properties, and these advantages further expand its application range. In this paper, a highly ordered and vertically aligned CTO nanotube array was successfully synthesized by a simple hydrothermal method with TiO2 nanotube (TNT) arrays as the precursor. It was found that the CTO nanotube had a higher optical absorption ability (3.4 eV), photovoltage (500 mV) and photocurrent density (0.004 A cm(-1)) under ultraviolet irradiation, compared to the TNT (350 mV and 0.0036 A cm(-1)). At the same time, the electrochemical impedance spectroscopy, Mott-Schottky and stability tests indicate that the CTO nanotube might be a promising alternative choice as the photoelectric material for a TNT.
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