Issue |
Microsc. Microanal. Microstruct.
Volume 6, Number 5-6, October / December 1995
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|
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Page(s) | 611 - 619 | |
DOI | https://doi.org/10.1051/mmm:1995151 |
DOI: 10.1051/mmm:1995151
Microstructural and Microanalytical Characterization of Pd Clusters in ORMOCER Matrix
Massimo Catalano1, 2, Elvio Carlino1, Maria Antonnella Tagliente1, Antonio Licciulli1 et Leander Tapfer11 Centro Nazionale Ricerca e Sviluppo Materiali (PASTIS-C.N.R.S.M.), Strada Statale 7 Appia km. 712, 72100 Brindisi, Italy
2 Istituto per lo studio di nuovi Materiali per l'Elettronica del Consiglio Nazionale delle Ricerche (IME-CND), Università di Lecce, Via Arnesano, 73100 Lecce, Italy
Abstract
Noble-metal clusters dispersed in glass matrix are of great
interest for their technological applications such as
heterogeneous catalysis, in the realization of non-linear
optical devices, in sensor technology, for absorption control in
solar reflecting glasses (
coatings) etc. The physical
properties of these materials strongly depend on cluster
concentration, size distribution and on their structural and
chemical nature. High spatial resolution structural and
analytical characterization techniques are needed to understand
the cluster formation mechanism and the physical properties of
these materials. In this work, palladium clusters dispersed in
ORMOCER matrix via a modified sol-gel process are structurally
and chemically characterized by conventional transmission
electron microscopy, high-resolution electron microscopy,
electron nanodiffraction and X-ray diffractometry, in order to obtain
information on the clusters shape, structure, spatial
distribution in the matrix and chemical nature. Samples heat
treated both in inert
atmosphere and in air at 400 °C for
different times are analyzed in order to obtain a deeper insight
in the formation and structural evolution of the clusters and in
the oxidation process. In fact after heat treatment in air,
clusters oxidation occurs and a PdO shell surrounding a core
with different structure
nm in diameter is formed. Heat
treatment in inert
atmosphere does not affect the clusters
shape, structure and distribution.
6146 - Structure of solid clusters, nanoparticles, and nanostructured materials.
6480G - Microstructure.
8140G - Other heat and thermomechanical treatments.
Key words
crystal microstructure -- electron diffraction -- heat treatment -- metal clusters -- palladium -- particle size -- sol gel processing -- transmission electron microscopy -- X ray diffraction -- microstructural characterization -- microanalytical characterization -- Pd clusters -- ORMOCER matrix -- noble metal clusters -- glass matrix -- spatial distribution -- N sub 2 atmosphere -- structural evolution -- oxidation process -- heat treatment -- oxidation -- cluster concentration -- size distribution -- high spatial resolution structural characterization -- PdO shell -- modified sol gel process -- transmission electron microscopy -- high resolution electron microscopy -- electron nanodiffraction -- X ray diffractometry -- 400 C -- Pd -- N sub 2
© EDP Sciences 1995