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Nano-scale X-ray absorption spectroscopy using XEOL-SNOM detection mode

Francesco Rocca;
2009
2009
Istituto di fotonica e nanotecnologie - IFN
XAFS14 - XIX “International Conference on X-ray Absorption fine Structure” , 26-31 July 2009
No
Camerino, MC (Italia)
Abstract: The knowledge of the local structure of nanocrystalline thin films is crucial for understanding and optimizing their functional properties. The volume averaging can hide local level deviations, because the properties of individual grains may deviate from the average ones. Therefore, special local sensitive methods, having nanoscale resolution, are required for adequate investigation of nanocrystalline thin films. The “X-TIP” STRP project supported by the European Commission under the 6th Framework Programme strove to address these needs through the combination of x-ray absorption spectroscopy (XAS) using synchrotron radiation microbeams with scanning near-field optical microscopy (SNOM) detection of the x-ray excited optical luminescence (XEOL) signal. The new instrumentation developed within this project offers the possibility to carry out a selective structural analysis of the sample surface with the subwavelength spatial resolution determined by the SNOM probe aperture. In addition, the apex of the optical fibre plays the role of a topographic probe, and chemical and topographic mappings can be simultaneously recorded. In this contribution, we will present the state of art and the experimental results obtained with the XAS-SNOM prototype at ESRF (Grenoble, F). We will illustrate the possibility to obtain an element-specific contrast and to perform nano-XAS experiments by detecting the Zn K and W L3 absorption edges in luminescent ZnO and ZnWO4 nanostructured thin films. The presence of ZnO phase is unambiguously detected only at the nano-scale by XAS-SNOM method. The analysis of the Zn K-edge XANES shows that ZnO nanocrystals exist in both wurtzite-type and high-pressure rock-salt-type phases.
8
none
Rocca, Francesco; Dalba, Giuseppe; Graziola, Roberto; Larcheri, Silvia; Pailharey, Daniel; Jandard, Franck; Kuzmin, Alexej; Purans, Juris
273
info:eu-repo/semantics/conferenceObject
04 Contributo in convegno::04.01 Contributo in Atti di convegno
04.01 Contributo in Atti di convegno
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/80011
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