1. Synthesis, novel luminescence properties, and surface-enhanced Raman scattering of Au/Y2O3: Eu3+ composite nanotubes.
- Author
-
Jiamin Su, Guofeng Wang, Ying Li, Rong Li, Bingyu Xu, Yuping Wang, and Jisen Zhang
- Subjects
GOLD compounds ,NANOSTRUCTURED materials synthesis ,NANOTUBES ,COMPOSITE materials ,LUMINESCENCE ,RAMAN scattering - Abstract
Y(OH)
3 :Eu3+ nanotubes were synthesized by a facile hydrothermal method first, and then Au particles were grown on the surface of Y2 O3 :Eu3+ nanotubes by combining the vacuum extraction method and the annealing process. The composite nanotubes were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The effects of the Au content on the photoluminescence properties of the Au/Y2 O3 :Eu3+ composite nanotubes were investigated in detail. In the excitation spectra of Au/Y2 O3 :Eu3+ monitored at 614 nm, the7 F0 →5 H3 transition from Eu3+ increased with increasing Au content, while the other sharp lines originating from Eu3+ f-f electron transitions almost vanished. In the emission spectra, the spectral configurations of Eu3+ in Au/Y2 O3 :Eu3+ composite nanotubes varied with the excitation wavelengths. When the excitation wavelength was 256 nm, the 5D4→7 F0 ,5 D7 →7 F0 ,5 G2 →7 F0 ,5 L6 →7 F0 ,5 D0 →7 F0 ,5 D0 →7 F1 ,5 D0 →7 F2 ,5 D0 →7 F3 , and5 D0 →7 F4 transitions from Eu3+ ions in Au/Y2 O3 :Eu3+ were observed. When the excitation wavelength was 378 nm, the plasmon resonance peak from Au nanoparticles was observed. In addition, 4-ATP was chosen as the model molecule to examine the performance of the Au/Y2 O3 :Eu3+ composite nanotubes as SERS substrates. The relative intensities of the SERS spectra enhanced with the increase of Au+ : Ln3+ ratio. [ABSTRACT FROM AUTHOR]- Published
- 2014
- Full Text
- View/download PDF