1. University of Reading, Department of Chemistry, Reading, UK
2. Universidade Federal do ABC, Centro de Ciências Naturais e Humanas, São Paulo, SP, Brazil
3. University of Copenhagen, Niels Bohr Institute, Copenhagen, Denmark
4. Universidade de São Paulo, Instituto de Física, São Paulo, SP, Brazil
5. Nanomicroscopy Center, Aalto University, Puumiehenkuja 2, FIN-02150 Espoo, Finland