1. Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
2. Laboratory for Multifunctional Materials, Department of Materials, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland
3. Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Laboratory of Photonics and Interfaces, Station 6, CH-1015 Lausanne, Switzerland