Add time:08/29/2019         Source:sciencedirect.com

Nanotube titanic acid (H2Ti2O5 · H2O, NTA) is thermally unstable. Its low-temperature (100–300 °C) dehydrated product (LD-NTA) possesses a symmetrical ESR signal with a g = 2.003, which is the characteristic of a single-electron-trapped oxygen vacancy (SETOV). High concentration SETOV defects can form a sub-band within the bandgap (Eg) of LD-NTA and exhibit a response to visible light. Each SETOV possesses one effective positive charge. Under visible light irradiation, the working electrode prepared from LD-NTA shows a p-type Iphoto–Vbias behavior (Iphoto = photocurrent, Vbias = bias potential), which suggests that SETOV in LD-NTA plays the role of major positive carriers, like h+.

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