TY - JOUR
T1 - Au(core)/Pd(shell) structures analyzed by high-resolution medium energy ion scattering
AU - Matsumoto, H.
AU - Mitsuhara, K.
AU - Visikovskiy, A.
AU - Akita, T.
AU - Toshima, N.
AU - Kido, Y.
N1 - Funding Information:
The authors thank our colleagues, M. Hazama and M. Shibuya for their assistant during the MEIS measurement. This work was supported by JST, Core Research for Evolutional Science and Technology, CREST.
Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2010/7/1
Y1 - 2010/7/1
N2 - Bimetallic nano-particles taking a core/shell structure dispersed on metal-oxide supports work more efficiently than the mono-metallic ones as heterogeneous catalyst. In order to elucidate the high catalytic activities, it is essential to analyze quantitatively the size and structure of the core/shell particles. Here, we demonstrate that high-resolution medium energy ion scattering (MEIS) spectrometry makes it possible to identify growth of bimetallic core/shell nano-particles and also to determine the average size of core and shell, respectively, together with the size distribution with an accuracy better than 0.1 nm. As an example, Au(core)/Pd(shell) particles with a nominal size (outer diameter) of 2.4 and 3.7 nm prepared by an alcohol reduction technique were analyzed using 120 keV He+ ions. The present analysis clearly showed formation of Au(core)/Pd(shell) structures with almost the same radii as those expected from the chemical preparation condition. Growth of Au/Pd alloyed particles and significant inclusion of Au and Pd mono-metallic particles were ruled out.
AB - Bimetallic nano-particles taking a core/shell structure dispersed on metal-oxide supports work more efficiently than the mono-metallic ones as heterogeneous catalyst. In order to elucidate the high catalytic activities, it is essential to analyze quantitatively the size and structure of the core/shell particles. Here, we demonstrate that high-resolution medium energy ion scattering (MEIS) spectrometry makes it possible to identify growth of bimetallic core/shell nano-particles and also to determine the average size of core and shell, respectively, together with the size distribution with an accuracy better than 0.1 nm. As an example, Au(core)/Pd(shell) particles with a nominal size (outer diameter) of 2.4 and 3.7 nm prepared by an alcohol reduction technique were analyzed using 120 keV He+ ions. The present analysis clearly showed formation of Au(core)/Pd(shell) structures with almost the same radii as those expected from the chemical preparation condition. Growth of Au/Pd alloyed particles and significant inclusion of Au and Pd mono-metallic particles were ruled out.
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U2 - 10.1016/j.nimb.2010.03.032
DO - 10.1016/j.nimb.2010.03.032
M3 - Article
AN - SCOPUS:77953129733
SN - 0168-583X
VL - 268
SP - 2281
EP - 2284
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
IS - 13
ER -