Chen Xiangping, Li Xin, Chen Dedong, Wang Lishi
Jewelry Institute, Guangzhou Panyu Polytechnic, Guangzhou 511483, People's Republic of China.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, People's Republic of China.
R Soc Open Sci. 2021 Mar 10;8(3):201778. doi: 10.1098/rsos.201778.
Anodization is a widely used method to obtain multicoloured oxidized titanium sheets. However, most researchers paid great attention to the colour-related properties instead of photoelectrical properties of titanium oxide film obtained by anodization. In this work, to study their photoelectrical properties, a series of multicoloured oxidized titanium sheets were prepared by anodization method, and UV-vis absorption and photocurrents were tested. The relationship between anodization voltages/anodization durations and photocurrents of titanium sheets was studied. Results show that titanium sheets have excellent photoelectrical performance. With the increase of anodization voltage, the number of UV-vis absorption peaks increased under visible light which means increasing absorption. When anodization duration increased, absorption band edge also increased in the visible light region, which means the band gap needed to produce charge transfer transition decreased. Under simulated sunlight and applied voltage of +0.4 V, photocurrent increased with the increase of either anodization voltage or anodization duration, and can be expressed by linear equations. In addition, anodization currents were recorded during anodization. Morphology, crystal structure and photoelectrical properties of anodized titanium sheets were characterized. The anodized titanium sheets can not only be used as decorative material in jewellery and architecture fields etc. but also are supposed to be used as photoelectrical catalyst in further work.
阳极氧化是一种广泛用于获得多色氧化钛片的方法。然而，大多数研究人员更关注通过阳极氧化获得的氧化钛薄膜的颜色相关特性，而非光电特性。在本研究中，为了研究它们的光电特性，采用阳极氧化法制备了一系列多色氧化钛片，并测试了紫外可见吸收和光电流。研究了阳极氧化电压/阳极氧化持续时间与钛片光电流之间的关系。结果表明，钛片具有优异的光电性能。随着阳极氧化电压的增加，可见光下紫外可见吸收峰的数量增加，这意味着吸收增强。当阳极氧化持续时间增加时，可见光区域的吸收带边缘也增加，这意味着产生电荷转移跃迁所需的带隙减小。在模拟太阳光和 +0.4 V 的外加电压下，光电流随着阳极氧化电压或阳极氧化持续时间的增加而增加，并且可以用线性方程表示。此外，在阳极氧化过程中记录了阳极氧化电流。对阳极氧化钛片的形貌、晶体结构和光电性能进行了表征。阳极氧化钛片不仅可以用作珠宝和建筑等领域的装饰材料，而且在进一步的工作中还有望用作光电催化剂。
