Amorphous TiO2 synthesized via Ti anodization is partially crystallized and displays strong microwave absorption ability. Interfacial electric field forms at the boundary of crystalline–amorphous phases due to the uneven oxygen-vacancy distributions in the two phases, amplifying the microwave absorption.
Regular ZnO nanorods were obtained by anodization using NaOH aqueous electrolytes which is affected by voltage, anodization time and electrolyte concentration.
Surface modification has been used as a method to create defects on [Formula: see text] materials, which can improve their desirable properties. In this paper, defected [Formula: see text] nano-powder was successfully synthesized by chemical reduction using [Formula: see text] as the reducing agent at 300–400[Formula: see text] under argon atmosphere. High defect concentration can be produced by increasing process temperature. The modified [Formula: see text] shows good visible light absorption and photocatalytic activity on degradation of Rhodamine B (4–9 times higher than the pristine [Formula: see text]) with the visible light irradiation. Further XPS analysis and theoretical studies using full potential linearized augmented plane wave (FP-LAPW) method as implemented in wien2k code revealed the existence of oxygen vacancy and [Formula: see text] in the modified samples. These types of defects were responsible for the modifications of the electronic and optical properties of [Formula: see text], resulting in the improved photocatalytic activity in visible light irradiation.
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