Depth Selective Electronic State Analysis of Implanted Nitrogen in Visible-Light Response TiO2 Photocatalyst


Article Preview

Energetic nitrogen ion was injected into a TiO2 photocatalyst in order to investigate the optimal local concentration of doped nitrogen for visible-light response. N+-implanted TiO2 samples promoted the photocatalytic activity under visible-light irradiation. N K-edge XANES of the highest activity sample indicated that N replaces the O sites near the surface, whereas in the samples of higher N+ fluence, N−O and/or N−N species formed. Depth-resolved N K-edge ELNES revealed the two types of N, depending on the concentration, and we found the local N concentration effective for visible-light response was less than ∼1 at%. Further, the spatial distributions of the different chemical states of N by energy-filtering TEM (FETEM) supported these findings.



Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee




T. Yoshida et al., "Depth Selective Electronic State Analysis of Implanted Nitrogen in Visible-Light Response TiO2 Photocatalyst", Materials Science Forum, Vols. 561-565, pp. 567-570, 2007

Online since:

October 2007




[1] A. Fujishima, T. N. Rao and D. A. Tryk, J. Photocehm. Photobiol. C1, 1 (2000).

[2] R. Asahi, T. Morikawa, T. Ohwaki, K. Aoki and Y. Taga, Science 293, 269 (2001).

[3] H Irie, Y. Watanabe and K. Hashimoto, J. Phys. Chem. B, 107, 5483 (2003).

[4] A. Erbil, G. S. Cargil, R. Frahm, R. F. Boehme, Phys. Rev. B, 37, 2450 (1988).

[5] K. Kimoto, T. Sekiguchi and T. Aoyama, J. Electron Microsc. 46, 369 (1997).

[6] T. Yoshida, S. Muto and J. Wakabayashi, Mater. Trans., submitted (2007).

[7] A. L. Ankudinov, B. Ravel, J. J. Rehr, and S. D. Conradson, Phys. Rev. B 58, 7565 (1998) ; J. Stöhr and R. Jaeger, Phys. Rev. B, 26, 4111 (1982).

[8] J-H. Wang, P. K. Hopke, T. M. Hancewicz, S. L. Zhang, Anal. Chim. Acta 476, 93 (2003).