Jump to main content
Jump to site search

Issue 3, 2014
Previous Article Next Article

Band gap engineered TiO2 nanoparticles for visible light induced photoelectrochemical and photocatalytic studies

Author affiliations

Abstract

Visible light-active TiO2 (m-TiO2) nanoparticles were obtained by an electron beam treatment of commercial TiO2 (p-TiO2) nanoparticles. The m-TiO2 nanoparticles exhibited a distinct red-shift in the UV-visible absorption spectrum and a much narrower band gap (2.85 eV) due to defects as confirmed by diffuse reflectance spectroscopy (DRS), photoluminescence (PL), X-ray diffraction, Raman spectroscopy, electron paramagnetic resonance, transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS) and linear scan voltammetry (LSV). The XPS revealed changes in the surface states, composition, Ti4+ to Ti3+ ratio, and oxygen deficiencies in the m-TiO2. The valence band XPS, DRS and PL results were carefully examined to understand the band gap reduction of m-TiO2. The visible light-responsive enhanced photocatalytic activity of m-TiO2 was demonstrated by degrading methylene blue and brilliant blue G. The EIS and LSV in the dark and under visible light irradiation further support the visible light-induced photocatalytic activities of the m-TiO2 due to a decrease in electron transfer resistance and an increase in photocurrent. This study confirms that m-TiO2 can be used effectively as a photocatalyst and photoelectrode material owing to its enhanced visible light-induced photocatalytic activity.

Graphical abstract: Band gap engineered TiO2 nanoparticles for visible light induced photoelectrochemical and photocatalytic studies

Back to tab navigation

Supplementary files

Publication details

The article was received on 09 Oct 2013, accepted on 29 Oct 2013 and first published on 29 Oct 2013


Article type: Paper
DOI: 10.1039/C3TA14052K
J. Mater. Chem. A, 2014,2, 637-644

  •   Request permissions

    Band gap engineered TiO2 nanoparticles for visible light induced photoelectrochemical and photocatalytic studies

    M. M. Khan, S. A. Ansari, D. Pradhan, M. O. Ansari, D. H. Han, J. Lee and M. H. Cho, J. Mater. Chem. A, 2014, 2, 637
    DOI: 10.1039/C3TA14052K

Search articles by author

Spotlight

Advertisements