1. Experimental Physics VI, Julius-Maximilian University of Würzburg, 97074 Würzburg, Germany
2. Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg, Germany
3. Laboratory for Materials and Interface Chemistry, Eindhoven University of Technology, 5600MB Eindhoven, The Netherlands
4. School of Physics and Astronomy, Kelvin Nanocharacterisation Centre, University of Glasgow, G12 8QQ Glasgow, Scotland
5. Luna Innovations Incorporated, 521 Bridge Street, Danville, Virginia 24541, United States