Abstract
In order to clarify the visible-light responsive photocatalysis of TiO2 co-doped with Cu and N atoms, plasma-nitridation was taken place to Cu-doped TiO2 film. Cu-doped TiO2 films were prepared by dip-coating method and they were nitrided by nitrogen plasma in the plasma-enhanced CVD system. Cu-doped TiO2 films before and after plasma-nitridation show similar X-ray diffraction peaks of anatase TiO2. XPS analysis reveals that the ionic states of Ti and Cu in the Cu-doped TiO2 films are Ti4+ and Cu+, respectively. After nitrogen plasma treatment, oxygen atoms are released by substitution of nitrogen atoms in the TiO2 matrix, so that Cu+ is oxidized to generate Cu2+ and at the same time oxygen vacancy is formed. The absorption edge of both Cu-doped and plasma-nitrided Cu-doped TiO2 did red shift. Visible-light responsive photocatalytic activity of the Cu-doped TiO2 film degraded after nitrogen plasma treatment.
Highlights
Titanium dioxide (TiO2) is well known as chemically stable and harmless material, and has been applied widely in various fields such as photocatalysts [1] [2] [3], dye-sensitized solar cells [4] [5] [6], water splitting [3] [7], and so on
This paper describes the effect of plasma-nitridation on visible-light responsive photocatalysis of Cu-doped TiO2 films
In the Cu-doped TiO2 films, Cu exists as Cu2O in the nearly stoichiometric TiO2 matrix and its content is estimated about 2 at% by calculation using sensitivity factor
Summary
Titanium dioxide (TiO2) is well known as chemically stable and harmless material, and has been applied widely in various fields such as photocatalysts [1] [2] [3], dye-sensitized solar cells [4] [5] [6], water splitting [3] [7], and so on Various utilizations such as antibacterial, antipollution and deodorization have been attained. This paper describes the effect of plasma-nitridation on visible-light responsive photocatalysis of Cu-doped TiO2 films. The visible-light response of photocatalysis is observed in the Cu-doped TiO2 film, it degrades after nitrogen-plasma treatment. It is considered that the both Cu2+ and oxygen vacancy act as recombination center of electrons and holes
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