Thickness dependent on photocatalytic activity of hematite thin films

Yen-Hua Chen, Kuo Jui Tu

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Hematite (Fe 2O 3) thin films with different thicknesses are fabricated by the rf magnetron sputtering deposition. The effects of film thicknesses on the photocatalytic activity of hematite films have been investigated. Hematite films possess a polycrystalline hexagonal structure, and the band gap decreases with an increase of film thickness. Moreover, all hematite films exhibit good photocatalytic ability under visible-light irradiation; the photocatalytic activity of hematite films increases with the increasing film thickness. This is because the hematite film with a thicker thickness has a rougher surface, providing more reaction sites for photocatalysis. Another reason is a lower band gap of a hematite film would generate more electron-hole pairs under visible-light illumination to enhance photocatalytic efficiency. Experimental data are well fitted with Langmuir-Hinshelwood kinetic model. The photocatalytic rate constant of hematite films ranges from 0.052 to 0.068 min -1. This suggests that the hematite film is a superior photocatalyst under visible-light irradiation.

Original languageEnglish
Article number980595
JournalInternational Journal of Photoenergy
Volume2012
DOIs
Publication statusPublished - 2012 Jan 13

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Fingerprint Dive into the research topics of 'Thickness dependent on photocatalytic activity of hematite thin films'. Together they form a unique fingerprint.

  • Cite this