Influence of Cd/S ratio on photocatalytic activity of high-vacuum-annealed CdS-TiO2thin film

✍ Scribed by Biswas, S. ;Hossain, M. F. ;Takahashi, T. ;Kubota, Y. ;Fujishima, A.

• Book ID: 105364902
• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 426 KB
• Volume: 205
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200778934

✦ Synopsis

Abstract

CdS–TiO~2~ thin film heterojunctions were prepared on glass substrates with various Cd/S ratios to optimize the photocatalytic efficiency in UV–visible light irradiation. The CdS underlayer was prepared by the chemical bath deposition technique and subsequently annealed in high vacuum of 5 × 10^–5^ Pa at 400 °C. The effect of vacuum annealing of the CdS layer on optical and photocatalytic properties of the CdS–TiO~2~ thin film was also studied. The photocatalytic activity, evaluated by the measurement of the decomposition of methanol in the gas phase under UV–visible light irradiation, shows higher efficiency for a vacuum‐annealed CdS underlayer deposited with Cd/S ratio ≈1:4. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)