1. S3, Istituto Nanoscienze, CNR, Via Campi 213/A, Modena 41125, Italy
2. Universidade de Sao Paulo (IFSC), Av. Trabalhador
são-carlense, São Carlos 400, Brazil
3. Faculty
of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstrasse 1, Duisburg D-47048, Germany
4. School
of Chemistry, University of Melbourne, Melbourne, Victoria 3010, Australia
5. Dipartimento
di Scienze Fisiche, Matematiche e Informatiche, Universitá di Modena e Reggio Emilia, Via Campi 213/A, Modena 41125, Italy
6. Institute
of Nanotechnology, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen D-76344, Germany
7. European Synchrotron Radiation Facility (ESRF), Avenue des Martyrs 71, Grenoble 38043, France
8. Institut de Physique et Chimie des Materiaux de Strasbourg, UMR 7504 UdS-CNRS, Strasbourg 67034 Cedex
2, France