1. Department of PhysicsHong Kong Baptist University Kowloon Tong Kowloon Hong Kong SAR China
2. HKBU Institute of Research and Continuing Education, 9FThe Industrialization Complex of Shenzhen Virtual University Park No. 2 Yuexing Third Road, South Zone, Hi‐tech Industrial Park, Nanshan District Shenzhen Guangdong 518057 China
3. Centre for BioImaging SciencesDepartment of Biological SciencesNational University of Singapore Singapore 117557 Singapore
4. Centre for Advanced 2D Materials and Graphene Research CentreDepartment of PhysicsNational University of Singapore Singapore 117551 Singapore
5. Institute of Advanced MaterialsState Key Laboratory of Environmental and Biological AnalysisGolden Meditech Centre for NeuroRegeneration SciencesHong Kong Baptist University Kowloon Tong Kowloon Hong Kong SAR China