• Neubert, T.J.; Rösicke, F.; Hinrichs, K.; Nickel, N.H.; Rappich, J.: Quantum Dot Modification of Large Area Graphene Surfaces via Amide Bonding. Advanced Materials Interfaces 11 (2024), p. 2301073/1-6

10.1002/admi.202301073
Open Access Version

Abstract:
Large-area graphene grown by chemical vapor deposition is functionalized by p-aminophenyl groups via the diazonium-route. Subsequently, carboxylic acid-modified CdSXSe1-X/ZnS dots (QDs) with maximum emission wavelengths of 540 nm and 630 nm are immobilized via amidation reaction to the amino-functionalized graphene on the copper growth substrate forming stable covalent bonds in all functionalization steps. After immobilization of the QDs, the functional QD/graphene stack is available for transfer from the growth substrate onto any other substrate. In this study, the QD-modified graphene is transferred to a Si wafer with surface oxide without losing the QD modification. The successful binding of the QDs onto the functionalized graphene is characterized by their vibrational signature using Raman backscattering and infrared-spectroscopic ellipsometry and by their specific light emission as measured by photoluminescence (PL) spectroscopy.