Synthesis, characterization, and photophysical properties of a carbon nanohorn-coumarin hybrid material

► Covalent attachment of a custom-functionalized coumarin onto carbon nanohorns. ► Spectroscopic, thermal, and microscopy characterization of CNH-coumarin hybrid. ► Photophysical and electrochemistry properties evaluation of CNH-coumarin hybrid. ► Deactivation of photoexcited coumarin unit in CNH-coumarin hybrid material.