S1 Supporting Information Macromolecularly “Caged” Carbon Nanoparticles for Intracellular Trafficking via Switchable Photoluminescence Santosh K. Misra, ‡ Indrajit Srivastava, ‡ Indu Tripathi, Enrique Daza, Fatemeh Ostadhossein and Dipanjan Pan* 1 Department of Bioengineering, University of Illinois at Urbana-Champaign 2 Beckman Institute of Advanced Science and Technology, University of Illinois at Urbana- Champaign 3 Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign 4 Carle Foundation Hospital, 611 West Park Street, Urbana, IL, USA 5 Institute for Sustainability in Energy and Environment, University of Illinois at Urbana-Champaign, Illinois, USA *Email: dipanjan@illinois.edu