Covalent and Non-covalent Conjugation of Few-Layered Graphene Oxide and Ruthenium(II) Complex Hybrids and Their Energy Transfer Modulation via Enzymatic Hydrolysis
journal contributionposted on 30.04.2018, 11:35 by Frankie Chi-Ming Leung, Vivian Wing-Wah Yam
Pyrene-containing ruthenium(II) tris-bipyridine complexes have been prepared. These complexes have been non-covalently attached onto the few-layered graphene oxide (GO) sheets through their high binding affinity for flat π-surfaces. Alternatively, the reduced graphene oxide (rGO) sheets have also been covalently functionalized with the ruthenium(II) tris-bipyridine complex. The prepared conjugates have been characterized by transmission electron microscopy (TEM), energy-dispersive X-ray analysis (EDX), X-ray diffraction (XRD), atomic force microscopy (AFM), Raman spectroscopy, thermogravimetric analysis (TGA), and UV–visible absorption spectroscopy. The energy transfer properties of the resulted conjugates between the graphene and transition metal complexes have been studied via esterase hydrolysis. The energy transfer efficiencies were found to vary with the separation between the donor and the acceptor units.
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thermogravimetric analysiscovalently functionalizedNon-covalent ConjugationTGAFew-Layered Graphene Oxidegraphene oxideAFMXRDX-rayfew-layered graphene oxideTEMEnergy Transfer Modulationrutheniumtris-bipyridinetransmission electron microscopybinding affinityspectroscopyEDXUVconjugateesterase hydrolysisacceptor unitsforce microscopyenergy transfer efficienciesenergy transfer propertiesπ- surfacestransition metal complexes