6533b873fe1ef96bd12d4c9e
RESEARCH PRODUCT
The influence of nitrogen incorporation on the optical properties of anodic Ta2O5
Hiroki HabazakiMonica SantamariaF. Di FrancoF. Di QuartoEtsushi Tsujisubject
PhotocurrentAqueous solutionMaterials scienceBand gapAnodizingGeneral Chemical EngineeringInorganic chemistryAnalytical chemistrychemistry.chemical_elementNitrogenAnodeIonNitrogen Incorporation Optical Properties Anodic Ta2O5Settore ING-IND/23 - Chimica Fisica ApplicatachemistryX-ray photoelectron spectroscopyElectrochemistrydescription
Abstract Anodic oxides were grown on sputter-deposited Ta in different aqueous solutions. A photoelectrochemical investigation was performed in order to estimate the band gap of the films as a function of the anodizing bath composition and formation voltage, i.e. thickness. Photoelectrochemical results provided evidence of sub-band gap photocurrent for films formed in a bath containing ammonium ions at pH 9. Elemental depth profiles obtained by glow discharge optical emission spectroscopy revealed the presence of nitrogen species in the outer part of the anodic films, which is bonded to Ta according to XPS analysis. A mechanism of nitrogen incorporation is proposed in order to account for the pH dependence of film composition.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-01-01 | Electrochimica Acta |