Abstract:A direct estimate of changes in the radiative and nonradiative decay rates of a chromophore near metal nanoparticles is obtained using a quantum mechanical description coupled to the polarizable continuum model. The results account for experimentally observed continuous change from decreased to increased fluorescence. The changes are described as the effects of a dependence on the distance and orientation between the chromophore and the metal nanoparticle, as well as the size, shape, number, and type of the me… Show more
“…CoPyPc shows a Q band peak at 680 nm (Table 1), and rGNS/CoPyPc shows a slightly red shifted Q-band at 682 nm. There is a large blue shift in the Q band of rGNS/CdSe-CoPyPc (at 672 nm) compared to CoPyPc alone, Table 1, Figure 7 C. The spectral shifts in MPc complexes in the presence of nanoparticles may depend on the orientation of the MPc on the nanoparticles as observed before for other dye systems [48].…”
Section: Uv-vis Absorption Spectral Characterization Of the Nanocomposupporting
Nanocomposites containing CdSe quantum dots, tetra(4‐(4,6‐diaminopyrimidin‐2‐ylthio) phthalocyaninatocobalt(II)) (CoPyPc) and reduced graphene nanosheets (rGNS) were devoloped and used for the modification of a glassy carbon electrode. Characterization of the nanocomposites was done by transmission electron microscopy (TEM) and X‐ray diffraction (XRD) analyses. Cyclic voltammetry (CV) was used for electrochemical characterization of the prepared nanocomposite for oxygen reduction reaction. The oxygen reduction activity for rGNS/CdSe‐CoPyPc nanocomposite was found to be superior over the individual nanomaterials in this study. The activity of the nanocomposite towards oxygen reduction was also tested for tolerance to methanol crossover effect using chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) studies.
“…CoPyPc shows a Q band peak at 680 nm (Table 1), and rGNS/CoPyPc shows a slightly red shifted Q-band at 682 nm. There is a large blue shift in the Q band of rGNS/CdSe-CoPyPc (at 672 nm) compared to CoPyPc alone, Table 1, Figure 7 C. The spectral shifts in MPc complexes in the presence of nanoparticles may depend on the orientation of the MPc on the nanoparticles as observed before for other dye systems [48].…”
Section: Uv-vis Absorption Spectral Characterization Of the Nanocomposupporting
Nanocomposites containing CdSe quantum dots, tetra(4‐(4,6‐diaminopyrimidin‐2‐ylthio) phthalocyaninatocobalt(II)) (CoPyPc) and reduced graphene nanosheets (rGNS) were devoloped and used for the modification of a glassy carbon electrode. Characterization of the nanocomposites was done by transmission electron microscopy (TEM) and X‐ray diffraction (XRD) analyses. Cyclic voltammetry (CV) was used for electrochemical characterization of the prepared nanocomposite for oxygen reduction reaction. The oxygen reduction activity for rGNS/CdSe‐CoPyPc nanocomposite was found to be superior over the individual nanomaterials in this study. The activity of the nanocomposite towards oxygen reduction was also tested for tolerance to methanol crossover effect using chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) studies.
“…Previous work [35] on spherical particles has shown that the maximum MIFE would be expected at a slightly longer wavelength than the λmax. It has been shown that MIFE can be predicted by considering a dipole model for the fluorophore molecules [35], [36]. Whilst it is possible to predict MIFE for axis-symmetric spheres using FDTD, the lack of symmetry of triangular structures means that a large number of points around the particle would need to be considered.…”
Section: Ag Nanostructures and Their Plasmonic Resonancementioning
“…The PCM technique has provided valuable insight into surface-enhancement processes. [20][21][22][23] Recently, we have also modeled nanoscale systems using finite element and basis set methods. Our approach includes partitioning the Green's function into a contribution that is effectively the interaction of the particles in vacuum (obtaining the 1/r potential), and an additional term which is effectively due to the electrostatic environment (unpublished results).…”
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