Ruthenium(II)-graphene nanohybrid systems

Michele Maggini^a, Stefano Agnoli^a, Simone Silvestrini^a, Hyacintha Lobo^a, Paola Ceroni^b, Luca Ravotto^b

^aDipartimento di Scienze Chimiche, University of Padova, Via Tiepolo 6, 35129 Padua, Italy, Padua, 35129, Italy

^bDepartment of Chemistry ''G. Ciamician'', University of Bologna, Italy, Via Francesco Selmi, 2, Bologna, Italy

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Hyacintha Lobo, 145
Publication date: 5th February 2015

Ruthenium(II) tris(2,2’-bipyridine), [Ru(bpy)₃]²⁺, complexes represent an important class of chromophoric systems with crucial properties, such as long excited state lifetimes, excellent light harvesting ability and electrochemical reversibility for solar energy conversion.¹The incorporation of such functional cores on high-electron mobility substrates like graphene, could lead to further interesting properties due to photoinduced energy- or electron-transfer phenomena. Keeping this objective in mind, we designed a nano-structured graphene conjugate, prepared by direct, covalent functionalization of reduced graphene oxide (rGO) with the hexafluorophosphate diazonium salt of Ru(II) tris(2,2’-bipyridine) complex. The resulting hybrid was characterized by optical spectroscopies, thermogravimetric analyses, scanning electron microscopy, X-ray photoelectron spectroscopy and cyclic voltammetry. Steady-state and time-resolved photophysical investigations showed that the luminescence of [Ru(bpy)₃]⁺² is subjected to a strong and effective quenching (95%) when it is covalently linked to rGO. The application studies of this hybrid system for understanding its role in promoting solar energy conversion will be presented and discussed.
Functionalized graphene nanohybrid
1. Beley, M.; Gros, P.C. Ruthenium Polypyridine Complexes Bearing Pyrroles and π-Extended Analogues. Synthesis, Spectroelectronic, Electrochemical, and Photovoltaic Properties. Organometallics 2014, 33, 4590–4606.

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