2015
DOI: 10.1038/srep14004
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Enhanced UV Emission From Silver/ZnO And Gold/ZnO Core-Shell Nanoparticles: Photoluminescence, Radioluminescence, And Optically Stimulated Luminescence

Abstract: The optical properties of core-shell nanoparticles consisting of a ZnO shell grown on Ag and Au nanoparticle cores by a solution method have been investigated. Both the ZnO/Ag and ZnO/Au particles exhibit strongly enhanced near-band-edge UV emission from the ZnO when excited at 325 nm. Furthermore, the UV intensity increases with the metal nanoparticle concentration, with 60-fold and 17-fold enhancements for the ZnO/Ag and ZnO/Au, core-shell nanoparticles respectively. Accompanying the increase in UV emission,… Show more

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Cited by 169 publications
(92 citation statements)
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“…This electronic stimulation could also promote electron transfer from non-optically active traps directly to the conduction band or to any other trap and recombination center. However, in this case the de-trapping mechanism should be faster, and the OSL curve should reveal a much more significantly enhanced initial OSL intensity and a faster decay17, which was not the case here. This may also suggest that the plasmon-mediated non-radiative transition of electrons from non-optically active to optically active traps occurs because the AgNP plasmons have the amount of energy that is necessary to cause such electronic transition.…”
mentioning
confidence: 56%
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“…This electronic stimulation could also promote electron transfer from non-optically active traps directly to the conduction band or to any other trap and recombination center. However, in this case the de-trapping mechanism should be faster, and the OSL curve should reveal a much more significantly enhanced initial OSL intensity and a faster decay17, which was not the case here. This may also suggest that the plasmon-mediated non-radiative transition of electrons from non-optically active to optically active traps occurs because the AgNP plasmons have the amount of energy that is necessary to cause such electronic transition.…”
mentioning
confidence: 56%
“…Although this energy-transfer mechanism (mechanism 2 – as described in the introduction) may have taken place in our NaCl/AgNP multilayered system, it could not account for the increased OSL decay times pointed out in Figs 1 and 3(b). Indeed, according to the literature, this energy transfer should decrease the luminescence lifetime, which in turn should reduce (or at least not increase) the OSL decay times17. Together, these observations suggested that a third mechanism might have caused OSL enhancement.…”
mentioning
confidence: 72%
“…The average reflectance was found to decrease with increasing temperature, as presented in Figure 5d, which can be correlated with the enlarged spacing or reduced surface coverage by alloy NPs. On the other hand, there was no significant development of peaks and dips in a specific wavelength region, which is likely due to the broadband absorption of incident light as alloy NPs possessed a smaller size compared to the incident wavelength [42]. Furthermore, the Raman spectra of all samples exhibited six vibration modes of sapphire and the peak intensity and position were probed by the A 1g vibration mode.…”
Section: Resultsmentioning
confidence: 94%
“…The TEM image of one of the Si-NCs/ZnO-NWs hybrid nanostructures (ZS2) is shown in Figure 2b Figure 2e. The peaks of both samples corresponded to the wurtzite phase of ZnO NWs [24,26], and the peaks with a higher intensity depict the preferential growth direction [0001] of the ZnO NWs. The absence of Si-specific peaks from ZS3 (red) presumably reflects the low volume fraction of Si NCs.…”
Section: Materials Characterizationmentioning
confidence: 99%