Add time:08/26/2019         Source:sciencedirect.com

Nanotubed titanic acid (H2Ti2O4(OH)2) is a novel kind of material. The electron spin resonance (ESR) and inter-related properties of its vacuum-dehydrated product were investigated by means of transmission electron microscopic, X-ray diffraction, ESR, diffuse reflectance spectra. The results showed that after treatment under vacuum (−0.1 MPa) at 100°C, single-electron-trapped oxygen vacancies (SETOV), characterized by a symmetrical ESR signal (g=2.003), were generated in nanotubed H2Ti2O4(OH)2 crystal lattice. The g=2.003 ESR signal intensity (IESR) increased with treatment time. SETOV played the role of F centers, the visible-light absorption power of vacuum-dehydrated H2Ti2O4(OH)2 was proportional to IESR. During vacuum dehydration at 100°C, the H2Ti2O4(OH)2 nanotubes shortened but its crystalline form kept unchanged. The formation mechanism of SETOV was discussed.

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