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Thermal Stability of Supported Noble Metal Nanoclusters

Published online by Cambridge University Press:  01 February 2011

Galif Kutluk ,
Shinya Yagi ,
Hirosuke Sumida ,
Hirofumi Namatame  and
Masaki Taniguchi
Galif Kutluk
Affiliation:
[email protected], Hishima University, Hiroshima Synchrotron Radition Center, 2-313 kagamiyama, Higashi-Hiroshima, N/A, 739-0046, Japan, +81-82-424-6293, +81-82-424-6294
Shinya Yagi
Affiliation:
[email protected], Nagoya University, School of engineering, Nagoya, N/A, 464-8603, Japan
Hirosuke Sumida
Affiliation:
[email protected], Mazda Motor Co., Technical Reserch Center, Fuchu, Hiroshima, 730-8670, Japan
Hirofumi Namatame
Affiliation:
[email protected], Hiroshima University, Hiroshima Synchrotron Radition Center, 2-313 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-0046, Japan
Masaki Taniguchi
Affiliation:
[email protected], Hiroshima University, Hiroshima Synchrotron Radition Center, 2-313 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-0046, Japan
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Abstract

Highly dispersive and size controlled Pd and Pt nanoclusters have been synthesized by gas condensation and Arc plasma source. The morphology, crystallographic structures, electronic structure and the temperature dependence of chemical states of nanocluster were investigated by using TEM, AFM, EXAFS and XPS, respectively. The results show that non-passivized Pd nanoclusters with the size of 1.5~ 5.7nm are consisted with pure Pd core covered by highly oxidized PdO2 thin layer. The dioxide state PdO2 layers start to converting to Pd at 120°C and vanishing at 180°C in a reduction atmosphere.

Keywords

PdPtx-ray photoelectron spectroscopy (XPS)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 915: Symposium R – Nanostructured Materials and Hybrid Composites for Gas Sensors and Biomedical Applications , 2006 , 0915-R06-18
Copyright
Copyright © Materials Research Society 2006

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