Effect of the support on the formation of FeCo alloy nanoparticles in an SBA-16 mesoporous silica matrix: An X-ray absorption spectroscopy study

Carta, D., Mountjoy, G., Apps, R., Corrias, A. (2012) Effect of the support on the formation of FeCo alloy nanoparticles in an SBA-16 mesoporous silica matrix: An X-ray absorption spectroscopy study. Journal of Physical Chemistry C, 116 (22). pp. 12353-12365. ISSN 1932-7447. (doi:10.1021/jp302927t) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1021/jp302927t

Abstract

A series of nanocomposites consisting of FeCo alloy nanoparticles supported on a three-dimensional cubic mesoporous silica matrix (SBA-16) were prepared by wet impregnation of the matrix with a solution of Fe and Co nitrates. FeCo alloy nanoparticles were obtained by heat treatment at 800 °C in reducing atmosphere of the impregnated SBA-16 previously calcined at 500 °C. Three different SBA-16 types were used as a support of the nanophase. The influence of the matrix on the absorption of Fe and Co ions was investigated using X-ray diffraction and X-ray absorption spectroscopy. In particular, extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) techniques at the Fe and Co K-edges were used in order to identify the intermediate products before reduction and to study the formation of the bcc FeCo alloy, which cannot be assessed unambiguously using X-ray diffraction. An important influence of the matrix has been observed in the phases formed before reduction, in the size of nanoparticles, and in the oxidation of the FeCo alloy nanoparticles.

Item Type: Article
DOI/Identification number: 10.1021/jp302927t
Uncontrolled keywords: Co ions, Effect of the support, Extended X-ray absorption fine structures, Fe-Co alloy, Intermediate product, Mesoporous Silica, Nano-phase, Reducing atmosphere, SBA-16 mesoporous silica, Wet impregnation, X-ray absorption near-edge structure techniques, Calcination, Extended X ray absorption fine structure spectroscopy, X ray absorption spectroscopy, X ray diffraction, Nanoparticles
Subjects: Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Anna Corrias
Date Deposited: 16 Dec 2014 13:49 UTC
Last Modified: 29 May 2019 13:56 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46163 (The current URI for this page, for reference purposes)
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