Abstract

Rh nanoparticles have been fabricated by the evaporation method using the He gas in the Rh evaporation chamber, connected with the pre-evacuation chamber of BL6N1 at Aichi Synchrotron Radiation Center (Aichi SR). The electronic and geometric properties of the Rh nanoparticles have been verified without atmosphere exposure (in situ XPS) and after atmosphere exposure (ex situ XPS) using SR-XPS and TEM. The size of Rh nanoparticles is estimated 1.8±0.5 nm in diameter and deposited on a substrate. Judging from the result of the in situ XPS analysis with photon energy of 2.0 keV and 3.5 keV, the surface of the deposited Rh nanoparticles without atmosphere exposure is the metallic state. On the other side, the outermost surface changes into Rh oxide after atmosphere exposure even in a short time. For a long time atmosphere exposure moreover, the Rh oxide increases in the depth direction, and the deep area is in the higher oxidation state. [DOI: 10.1380/ejssnt.2017.50]

Highlights

  • To meet the present stringent regulation for automobile emission, catalysts play an important role in purifying exhaust gases

  • Rh nanoparticles have been fabricated by the evaporation method using the He gas in the Rh evaporation chamber, connected with the pre-evacuation chamber of BL6N1 at Aichi Synchrotron Radiation Center (Aichi Synchrotron radiation (SR))

  • The electronic and geometric properties of the Rh nanoparticles have been verified without atmosphere exposure and after atmosphere exposure using SR-X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM)

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Summary

15 April 2017

Yuki Koda∗ Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan and Technical Research Center, Mazda Motor Corporation, Shinchi, Fuchu-cho, Aki-gun, Hiroshima 730-8670, Japan. Hirosuke Sumida Technical Research Center, Mazda Motor Corporation, Shinchi, Fuchu-cho, Aki-gun, Hiroshima 730-8670, Japan. Satoshi Ogawa Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan. Hirofumi Namatame Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan (Received 24 October 2016; Accepted 27 February 2017; Published 15 April 2017). Judging from the result of the in situ XPS analysis with photon energy of 2.0 keV and 3.5 keV, the surface of the deposited Rh nanoparticles without atmosphere exposure is the metallic state. For a long time atmosphere exposure the Rh oxide increases in the depth direction, and the deep area is in the higher oxidation state.

INTRODUCTION
Fabrication of Rh nanoparticle
Analysis of Rh nanoparticle
TEM studies of Rh nanoparticle
XPS analysis
CONCLUSIONS
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