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Three-dimensional hierarchical anatase@rutile TiO2 nanotree array films decorated by silver nanoparticles as ultrasensitive recyclable surface-enhanced Raman scattering substrates.
- Source :
-
Journal of Alloys & Compounds . Nov2017, Vol. 725, p1166-1174. 9p. - Publication Year :
- 2017
-
Abstract
- In this paper, we report a three-dimensional (3D) hierarchical nanostructure as a surface-enhanced Raman scattering (SERS) sensor by decorating Ag nanoparticles on a TiO 2 nanotree (TNT) array film via a simple two-step hydrothermal treatment and a magnetron sputtering technique for the first time. The sensitivity, recyclability, and uniformity of the SERS-active substrates were investigated using Rhodamine 6G (R6G) as the probe molecule. A detection limit of 1.0 × 10 −12 M R6G molecules and an enhancement factor of 5.29 × 10 5 were achieved on the 3D hierarchical TNT array film with 60 s Ag-sputtering. More importantly, the optimized TNT/Ag also exhibits excellent recyclability and uniformity. The relative standard deviation in the intensity of Raman vibration mode (1506 cm −1 ) was about 1.2%. Furthermore, the 3D hierarchical nanostructure was more efficient than the 1D nanostructure for SERS measurements. The excellent SERS performance is attributed to the formation of high-density hot spots for 3D nanostructure as well as the synergistic effects of electromagnetic and charge transfer. Moreover, the anatase@rutile mixed phase provides an additional charge transfer effect, which can lead to further enhancement of the Raman signal. The results show that the TNT/Ag nanostructure can be a promising candidate for SERS sensors. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 725
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 125175622
- Full Text :
- https://doi.org/10.1016/j.jallcom.2017.07.242