info:eu-repo/semantics/article
Energy Transfer between CNT Surface and -Re(CO)3(phen)+∗ Pendants Grafted to P4VP in Nanohybrid Shish-Kebob-like Structures
Fecha
2019-12Registro en:
Maisuls, Iván; Ostendorp, Stefan; Wilde, Gerhard; Parola, A. Jorge; Strassert, Cristian A. ; et al.; Energy Transfer between CNT Surface and -Re(CO)3(phen)+∗ Pendants Grafted to P4VP in Nanohybrid Shish-Kebob-like Structures; American Chemical Society; Journal of Physical Chemistry C; 124; 1; 12-2019; 1238-1248
1932-7447
CONICET Digital
CONICET
Autor
Maisuls, Iván
Ostendorp, Stefan
Wilde, Gerhard
Parola, A. Jorge
Strassert, Cristian A.
Wolcan, Ezequiel
Resumen
The adsorption of a Re(CO)3(phen)-poly(4-vinylpyridine) polymer, RePVP, on multiwall carbon nanotubes surfaces is studied by transmission electron microscopy and absorption spectroscopy in combination with chemometric techniques in MeOH/H2O solvent mixture. Nanohybrid structures like a shish-kebab (NHSK) are observed by TEM when RePVP is wrapped around carbon nanotubes (CNTs) surfaces. The association between RePVP and CNTs studied by absorption spectroscopy suggests the coexistence of CNTs with a high or low content of adsorbed RePVP on their surface. In the absence of CNTs, the photophysical properties of RePVP (i.e., luminescence quantum yield, ΦL, and amplitude-weighted average lifetimes, ⟨τ⟩) are strongly dependent on the morphology of the polymer as witnessed by the dependence of ΦL on the concentration of RePVP (CRePVP) and the fact that in CH3CN ΦL and ⟨τ⟩ are sensitive to O2 while in a MeOH/H2O solvent mixture they are not. In the NHSK, an energy-transfer process between excited −[Re(CO)3(phen)]+* pendent chromophores and the CNTs surface, with static and dynamic components, is responsible for the quenching of the RePVP luminescence by CNTs.