N doping of oxide nanosheets.
Photo-N doping for Nb-O system oxide nanosheets such as Nb(6)O(17), TINbO(5), and Ca(2)Nb(3)O(10) was succeeded in by treatment under mild conditions, where their H-restacked forms containing tetrabuthylammonium (TBA) ion were illuminated by UV light at room temperature. A relatively strong absorption in visible light region (400 approximately 600 nm) was observed for the N-doped samples because of formation of p-band or valence band hybridization of N in the Nb-O bandgap. The N doping proceeded only under TBA presence in water without O(2), and Pt loading promoted this doping reaction. It is proposed as a mechanism from the results of the doping for the Ti-O and Nb-O nanosheet mixed samples, that the Nb-O nanosheet acts as a photocatalyst for the N-doping reaction. This is the first report of N doping to oxide nanosheets.
Matsumoto
Yasumichi
Y
Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan. yasumi@gpo.kumamoto-u.ac.jp
Koinuma
Michio
M
Iwanaga
Yoshifumi
Y
Sato
Tetsuya
T
Ida
Shintaro
S