Titania thin films with red-shifted photoresponse: Non-stoichiometry and cation doping

Paul A. Desario, Le Chen, Michael E. Graham, Kimberly A Gray

Research output: Contribution to journalArticlepeer-review


The objective of this research is to synthesize TiO2 nano-structured thin films with properties tailored for the photoreduction of CO2 to CH4 under UV and visible light. Our efforts are guided by the objectives of creating a high number of photoactive sites, optimizing charge separation, and increasing response to visible light for improved photo-efficiency. Reactive magnetron sputtering with partial pressure control of oxygen is utilized to fabricate mixed-phase TiO2 films with novel nanostructures, high solid-solid interfacial areas and enhanced oxidative and reductive activities. Recent studies have focused on the role of non-stoichiometry (oxygen vacancies) and cation doping (Nb) in titania to influence the photoresponse and photocatalytic performance. Non-stiochiometric films show a strong red-shift and there is an optimal non-stiochiometry for films with respect to methane yield from CO2 reduction. Nb-doped films were also prepared to evaluate the effect of cation doping on optical, chemical and physical properties.

Original languageEnglish (US)
JournalACS National Meeting Book of Abstracts
StatePublished - Dec 1 2010

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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