Study on the photoelectrical performance of anodized titanium sheets

Abstract

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.

Cross‐Linked Amidoximated Poly(acrylonitrile‐acrylic acid) Microspheres with Exceptional Adsorption Capacity, Reusability towards Copper(II): Batch and Column Studies

“…The peaks of ‐NH 2 of urea at 3460 cm −1 and 3346 cm −1 (symmetric and asymmetric stretching vibrations) disappeared in the AUN samples. In the meantime, the newly‐appeared band at 1075 cm −1 representing the stretching vibration peaks of −C−N of −CONH, the peak of −C−O− was not shown in AUN, indicating that urea reacted successfully with the carboxyl group of AA [17,18] . However, the peaks of 1685 cm −1 and 1622 cm −1 of −C=O (in AUN) correspond to the amide carbonyl and urea carbonyl.…”

“…In the meantime, the newly-appeared band at 1075 cm À 1 representing the stretching vibration peaks of À CÀ N of À CONH, the peak of À CÀ OÀ was not shown in AUN, indicating that urea reacted successfully with the carboxyl group of AA. [17,18] However, the peaks of 1685 cm À 1 and 1622 cm À 1 of À C=O (in AUN) correspond to the amide carbonyl and urea carbonyl. Herein, the cross-linking structure, which should guarantee the stability of mechanical properties and consequent reusability.…”

Acrylamide macromolecules modified wine lees‐soy protein wood adhesive

“…18,20 This disruption makes the protein denaturation severe and unfavorable for stretching protein molecules under high-concentration conditions. 21 Secondly, urea also interacts with van der Waals forces between protein molecules, 19,22 reducing the interaction force between protein molecules and promoting the depolymerization of protein molecules, which leads to a decrease in viscosity. As can be seen from Figure 3b, the viscosity was 12,945 mPa s before the combined pretreatment with urea and NaOH, and the viscosity decreased to 4320 mPa s after the pretreatment, with a decrease of about 66.7%, which provided the fluidity for the cross-linking reaction stage.…”