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ACS Appl Mater Interfaces ; 2(6): 1743-53, 2010 Jun.
Article in English | MEDLINE | ID: mdl-20527731

ABSTRACT

Nitrogen doping of TiO(2) films (N:TiO(2)) has been shown to improve the visible-light sensitivity of TiO(2), thereby increasing the performance of both photovoltaic and photocatalytic devices. Inductively coupled rf plasmas containing a wide range of nitrogen precursors were used to create nitrogen-doped TiO(2) films. These treatments resulted in anatase-phased materials with as high as 34% nitrogen content. As monitored with high-resolution X-ray photoelectron spectroscopy spectra, the nitrogen binding environments within the films were controlled by varying the plasma processing conditions. XPS peak assignments for multiple N 1s binding environments were made based on high resolution Ti 2p and O 1s XPS spectra, Fourier transform infrared spectroscopy (FTIR) data, and literature N 1s XPS peak assignments. The N:TiO(2) films produced via plasma treatments displayed colors ranging from gray to brown to blue to black, paralleling the N/Ti ratios of the films. Three possible mechanisms to explain the color changes in these materials are presented.


Subject(s)
Colorimetry/methods , Nitrogen/chemistry , Photochemistry/methods , Titanium/chemistry , Catalysis , Materials Testing , Models, Statistical , Optics and Photonics , Photoelectron Spectroscopy/methods , Spectroscopy, Fourier Transform Infrared , Surface Properties , Thermodynamics , X-Ray Diffraction
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