1. Division of Chemistry and Biological ChemistrySchool of Physical and Mathematical SciencesNanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
2. State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of Technology Wuhan 430070 P.R. China
3. Center for Advanced Functional NanorobotsDepartment of Inorganic Chemistry InstitutionUniversity of Chemistry and Technology Prague Technická 5 166 28 Prague 6 Czech Republic
4. Future Energy and Innovation LaboratoryCentral European Institute of TechnologyBrno University of Technology Purkyňova 656/123 Brno CZ-616 00 Czech Republic