Surface Analysis of Tungsten Doped TiO2 Films and Its Effect on Photocatalytic Degradation of Environmental Pollutants

Autores/as

  • Ravi Ranjan Randey1 Ranjan Randey
  • Krishan Kumar Saini National Physical Laboratory New Delhi - 110012 INDIA
  • Mohinder Paul
  • C P Sharma
  • Chander Kant
  • Marshal Dhayal

Palabras clave:

TiO2, hexavalent cation, photo catalytic activities, nanostructures

Resumen

Nanocrystalline TiO2 films, undoped and doped W6+ ions have been prepared on cleaned glass substrate by sol-gel route. Formation of anatase TiO2 phase has been confirmed by XRD analysis of the samples annealed at 550oC for 5 hours. Size of nanocrystals calculated by Debye-Scherrer’s formula and measured by TEM was found to decrease with increase in doping level. Average nanocrystal diameter in undoped sample is ~ 60 nm and 5 mole % W6+ ion doped sample is ~33 nm. SEM and AFM observation shows surface roughness of the order of the particles size in undoped as well as W6+ ion doped samples. Calculations have shown ~50% increase kinetic efficiency of the films doped with 5mole% W6+ ions. XPS analysis revealed more oxygen deficiency and enhanced surface carbon content of the doped film. The increase photocatalytic activity of the doped film has complex dependent on the film porosity, roughness, existence of oxygen vacancies and carbon content at the surface of the W+6 ion doped film. Keywords:  TiO2, hexavalent cation, photo catalytic activities, nanostructures

Biografía del autor/a

  • Krishan Kumar Saini, National Physical Laboratory New Delhi - 110012 INDIA
    Scientist - FPolymeric And Soft Materials Section

Descargas

Publicado

2011-09-05

Número

Vol. 1 Núm. 1 (2011)

Sección

Review Articles

Licencia

Declaration and Copyright Transfer Form

(to be completed by authors)

I/ We, the undersigned author(s) of the submitted manuscript, hereby declare, that the above manuscript which is submitted for publication in the STM Journals(s), is not published already in part or whole (except in the form of abstract) in any journal or magazine for private or public circulation, and, is not under consideration of publication elsewhere.

·         I/We will not withdraw the manuscript after 1 week of submission as I have read the Author Guidelines and will adhere to the guidelines.

·         I/We Author(s ) have niether given nor will give this manuscript elsewhere for publishing after submitting in STM Journal(s).

·         I/ We have read the original version of the manuscript and am/ are responsible for the thought contents embodied in it. The work dealt in the manuscript is my/ our own, and my/ our individual contribution to this work is significant enough to qualify for authorship.

·          I/We also agree to the authorship of the article in the following order:

Author’s name                                    

 

1. ________________

2. ________________

3. ________________

_______________

We  Author(s) tick this box and would request you to consider it as our signature as we agree to the terms of this Copyright Notice, which will apply to this submission if and when it is published by this journal.