Photoelectrochemical analysis on the passive film formed on Ti in pH 8.5 buffer solution

Authors :: Dong-Yung Kim
SeJin Ahn
Hyuk-Sang Kwon
Source :: Thin Solid Films. 513:212-216
Publication Year :: 2006
Publisher :: Elsevier BV, 2006.
Abstract: The structure of passive film formed on Ti in pH 8.5 buffer solution was examined by comparing the photocurrent for both the passive film and the thermally grown oxide on Ti in air at 400 °C. The passive films formed on Ti in pH 8.5 buffer solution showed optical band gap energy of 3.36 eV, while the thermally grown oxide film on Ti was found to have band gap energy of 3.1 eV. The higher value of band gap energy of passive film was attributed to the less crystalline or more disordered structure of passive film compared to that of the thermal oxide. This fact was supported by the higher disorder energy of passive film, determined from the absorption tail of photocurrent spectrum, than that of thermal oxide.

Subjects :: Photocurrent
Materials science
Band gap
Photoconductivity
Metals and Alloys
Oxide
Analytical chemistry
Mineralogy
Surfaces and Interfaces
Buffer solution
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Amorphous solid
chemistry.chemical_compound
chemistry
Materials Chemistry
Electronic band structure
Absorption (electromagnetic radiation)

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