A New SERS Substrate Based on TiO₂ Nanorods Thin Film Assembled Gold Nanoparticles

Abstract:

Surface enhanced Raman scattering (SERS) has been proved to be a highly sensitive method to detect organic molecules at very low concentrations. In recent years, many researchers have reported that 1-dimension semiconductor nanomaterials assembled noble metal nanoparticles can get a strong SERS effect. In this paper, we succeeded to synthesize TiO₂ nanorod thin films on fluorine-doped tin oxide (FTO) glass with hydrothermal synthesis which were able to be used as SERS substrates. Gold nanoparticles were assembled to TiO₂ nanorod thin films using the physical sputtering method and the citrate reduction method, respectively. The field emission scanning electron microscope (FESEM) images show that the later method could achieve the more desirable and uniform distribution of gold nanoparticles. Rhodamine 6G (R6G) was chosen as the probe molecule to study the SERS performance of our novel SERS substrates. Raman scattering measurement proved that the substrates were able to enhance Raman signals by several orders of magnitude and could be applied to biochemical detection. The whole fabrication process was facile and cost-effective, and the SERS activity and reproducibility of the substrates were pretty good.

• Periodical: Advanced Materials Research (Volume 1096)
• Pages: 481-485
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1096.481
• Online since: April 2015
• Authors: Xu Feng Yu, Xiu Lan Cheng*, Peng Yu Lv
• Keywords: Gold Nanoparticle, Hydrothermal Synthesis, SERS, TiO₂ Nanorod

References

[1] M. Fleischmann, P.J. Hendra, A.J. McQuillan, Raman spectra of pyridine adsorbed at a silver electrode, J. Chemical Physics Letters. 26 (1974) 163-166.

DOI: 10.1016/0009-2614(74)85388-1

[2] P.G. Etchegoin, L.E. Ru, A perspective on single molecule SERS: current status and future challenges, J. Physical Chemistry Chemical Physics. 10 (2008) 6069-6200.

DOI: 10.1039/b809196j

[3] G. Wu, J. Wang, D.F. Thomas, et al., Synthesis of F-doped flower-like TiO2 nanostructures with high photoelectrochemical activity, J. Langmuir. 24 (2008) 3503-3509.

DOI: 10.1021/la703098g

[4] C. Caro, C. López-Cartes, P. Zaderenko, et al., Thiol-immobilized silver nanoparticle aggregate films for surface enhanced Raman scattering, J. Journal of Raman spectroscopy. 39 (2008) 1162-1169.

DOI: 10.1002/jrs.1957

[5] B. Liu, E. Aydil, Growth of oriented single-crystalline rutile TiO(2) nanorods on transparent conducting substrates for dye-sensitized solar cells, J. Journal of the American Chemical Society. 131 (2009) 3985-90.

DOI: 10.1021/ja8078972