Details
| Original language | English |
|---|---|
| Pages (from-to) | 6667-6674 |
| Number of pages | 8 |
| Journal | Nanoscale |
| Volume | 7 |
| Issue number | 15 |
| Early online date | 12 Mar 2015 |
| Publication status | Published - 21 Apr 2015 |
Abstract
Plasmonic nanostructures comprising Au and ZnO nanoparticles synthesized by the spontaneous reduction of HAuCl4 in ethylene glycol were used to assess the possibility of modulating the direction of the electron transfer processes at the interface. One electron UV reduction and visible oxidation of the reversible couple TEMPOL/TEMPOL-H was confirmed by EPR spectroscopy. The apparent quantum yield for TEMPOL-H conversion under continuous wave visible excitation depends on the irradiation wavelength, being 0.57% and 0.27% at 450 ± 12 and 530 ± 12 nm, respectively. These results indicate that both the surface plasmon resonance and the interband transition from the 5d to the 6s level of Au nanoparticles contribute to the visible activity of the nanostructure. In addition, by detecting free electron conduction band electrons in ZnO, after the visible excitation of Au/ZnO nanostructures, we provide direct evidence of the photoexcited electron transfer from gold nanoparticles to ZnO. This journal is
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
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In: Nanoscale, Vol. 7, No. 15, 21.04.2015, p. 6667-6674.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Modulation of the electron transfer processes in Au-ZnO nanostructures
AU - Aguirre, M. E.
AU - Armanelli, A.
AU - Perelstein, G.
AU - Feldhoff, Armind
AU - Tolley, A. J.
AU - Grela, M. A.
N1 - Publisher Copyright: © The Royal Society of Chemistry.
PY - 2015/4/21
Y1 - 2015/4/21
N2 - Plasmonic nanostructures comprising Au and ZnO nanoparticles synthesized by the spontaneous reduction of HAuCl4 in ethylene glycol were used to assess the possibility of modulating the direction of the electron transfer processes at the interface. One electron UV reduction and visible oxidation of the reversible couple TEMPOL/TEMPOL-H was confirmed by EPR spectroscopy. The apparent quantum yield for TEMPOL-H conversion under continuous wave visible excitation depends on the irradiation wavelength, being 0.57% and 0.27% at 450 ± 12 and 530 ± 12 nm, respectively. These results indicate that both the surface plasmon resonance and the interband transition from the 5d to the 6s level of Au nanoparticles contribute to the visible activity of the nanostructure. In addition, by detecting free electron conduction band electrons in ZnO, after the visible excitation of Au/ZnO nanostructures, we provide direct evidence of the photoexcited electron transfer from gold nanoparticles to ZnO. This journal is
AB - Plasmonic nanostructures comprising Au and ZnO nanoparticles synthesized by the spontaneous reduction of HAuCl4 in ethylene glycol were used to assess the possibility of modulating the direction of the electron transfer processes at the interface. One electron UV reduction and visible oxidation of the reversible couple TEMPOL/TEMPOL-H was confirmed by EPR spectroscopy. The apparent quantum yield for TEMPOL-H conversion under continuous wave visible excitation depends on the irradiation wavelength, being 0.57% and 0.27% at 450 ± 12 and 530 ± 12 nm, respectively. These results indicate that both the surface plasmon resonance and the interband transition from the 5d to the 6s level of Au nanoparticles contribute to the visible activity of the nanostructure. In addition, by detecting free electron conduction band electrons in ZnO, after the visible excitation of Au/ZnO nanostructures, we provide direct evidence of the photoexcited electron transfer from gold nanoparticles to ZnO. This journal is
UR - http://www.scopus.com/inward/record.url?scp=84926435757&partnerID=8YFLogxK
U2 - 10.1039/c5nr00364d
DO - 10.1039/c5nr00364d
M3 - Article
AN - SCOPUS:84926435757
VL - 7
SP - 6667
EP - 6674
JO - Nanoscale
JF - Nanoscale
SN - 2040-3364
IS - 15
ER -