Quick Search: Journal  Author  Title/Abstract  Vol./Year 

Jpn. J. Appl. Phys. 43 (2004) pp. 4595-4598  |Previous Article| |Next Article|  |Table of Contents|
|Full Text PDF (1624K)| |Buy This Article|

Local Barrier Height of Ir/TiO2 Model Catalysts

Yasushi Maeda, Tomoki Akita1, Mitsutaka Okumura2 and Masanori Kohyama1

Research Institute for Green Technology, National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba West, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
1Special Division of Green Life Technology, National Institute of Advanced Industrial Science and Technology (AIST) Kansai, 1-8-31 Midorigaoka, Ikeda, Osaka 567-8577, Japan
2Department of Chemistry, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan

(Received January 8, 2004; accepted February 24, 2004; published July 29, 2004)

Iridium was deposited on TiO2(110)-(1×2) surfaces by vacuum evaporation to form Ir/TiO2 model catalysts. The local barrier height (LBH) of Ir/TiO2 was then measured using scanning tunneling microscopy (STM) and compared with that of Au/TiO2. From STM observations, it appeared that Ir was oxidized to IrO2 by annealing at 1073 K. The LBH of IrO2 particles was almost the same as that of the TiO2 substrate, while the LBH of Au particles was 0.3 eV larger. These results suggest that a charge transfer between IrO2 and TiO2 is small, and electrons are transferred from TiO2 to Au.

KEYWORDS: STM, local barrier height, work function, Ir, Au, nanoparticle, catalysis
URL: http://jjap.ipap.jp/link?JJAP/43/4595/
DOI: 10.1143/JJAP.43.4595


|Full Text PDF (1624K)| |Buy This Article| Citation:

References

  1. M. Haruta, N. Yamada, T. Kobayashi and S. Iijima: J. Catal. 115 (1989) 301.
  2. M. Haruta: Catal. Today 36 (1997) 153.
  3. M. Haruta: CATTECH 6 (2002) 102.
  4. T. Engel and G. Ertl: Adv. Catal. 28 (1979) 1.
  5. D. S. Stark and M. R. Harris: J. Phys. E 21 (1988) 715[IoP STACKS].
  6. D. R. Schryer, B. T. Upchurch, J. D. van Norman, K. G. Brown and J. Schryer: J. Catal. 122 (1990) 193.
  7. M. Valden, X. Lai and D. W. Goodman: Science 281 (1998) 1647[Science].
  8. B. E. Salisbury, W. T. Wallace and R. L. Whetten: Chem. Phys. 262 (2000) 131.
  9. H. Hakkinen and U. Landman: J. Am. Chem. Soc. 123 (2001) 9704[CrossRef].
  10. M. Okumura, Y. Kitagawa, M. Haruta and K. Yamaguchi: Chem. Phys. Lett. 346 (2001) 163[CrossRef].
  11. Y. Maeda, M. Okumura, S. Tsubota, M. Kohyama and M. Haruta: Appl. Surf. Sci. 222 (2004) 409[CrossRef].
  12. M. Okumura, N. Masuyama, E. Konishi, S. Ichikawa and T. Akita: J. Catal. 208 (2002) 485.
  13. R. A. Bennett, P. Stone, N. J. Price and M. Bowker: Phys. Rev. Lett. 82 (1999) 3831[APS].
  14. S. Takakusagi, K. Fukui, F. Nariyuki and Y. Iwasawa: Surf. Sci. 523 (2003) L41[CrossRef].
  15. S. Kurokawa, M. Yuasa, A. Sakai and Y. Hasegawa: Jpn. J. Appl. Phys. 36 (1997) 3860[IPAP].
  16. J. Herion: Appl. Surf. Sci. 151 (1999) 73[CrossRef].
  17. A. Berko and F. Solymosi: Surf. Sci. 411 (1998) L900[CrossRef].
  18. P. S. Patil, P. S. Chigare, S. B. Sadale, T. Seth, D. P. Amalnerkar and R. K. Kawar: Mater. Chem. & Phys. 80 (2003) 667.
  19. M. Uda, A. Nakamura, T. Yamamoto and Y. Fujimoto: J. Electron Spectrosc. Relat. Phenom. 88 (1998) 643.
  20. B. R. Chalamala, R. H. Reuss, K. A. Dean, E. Sosa and D. E. Golden: J. Appl. Phys. 91 (2002) 6141[AIP Scitation].
  21. V. E. Henrich and P. A. Cox: The Surface Science of Metal Oxides (Cambridge University Press, Cambridge, 1994) p. 9.
  22. V. E. Henrich, G. Dresselhaus and H. J. Zeiger: Phys. Rev. Lett. 36 (1976) 1335[APS].
  23. B. R. Chalamala, Y. Wei. G. Rossi, B. G. Smith and R. H. Reuss: Appl. Phys. Lett. 77 (2000) 3284[AIP Scitation].
|TOP|  |Previous Article| |Next Article|  |Table of Contents| |JJAP Home|
Copyright © 2010 The Japan Society of Applied Physics
Contact Information