Preparation of Ag/TiO2 Hybrid Nanoparticles in W/O Emulsion and Its Surface-enhanced Raman Scattering Effect

Chem. J. Chinese Universities ›› 2005, Vol. 26 ›› Issue (12): 2203.

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Preparation of Ag/TiO₂Hybrid Nanoparticles in W/O Emulsion and Its Surface-enhanced Raman Scattering Effect

ZHANG Dan¹, ZHANG Rong-Wei¹, SONG Xi-Ming^2*, ZHAO Da-Cheng¹,ZHANG Ming¹, LI Ying², LIU Feng-Qi^1*

1. College of Chemistry, Jilin University, Changchun 130023, China;
2. College of Chemical Science and Engineering, Liaoning University, Shenyang 110036, China

Received:2004-11-22 Online:1905-03-14 Published:1905-03-14
Contact: Liu Feng-Qi,E-mail:fengqiliu@21cn.com;

Abstract

Abstract:

Ag/TiO₂hybrid nanoparticles have been synthesized via a remarkably simple one-pot route in water-in-oil emulsions, where the reduction of Ag⁺ to Ag⁰ in water phase and the hydrolysis of Ti(OC₄H₉)₄ at the water/oil interface took place simultaneously. Such hybrid nanoparticles were characterized with TEM, SPS, XPS and X-ray diffraction. The procedure led to form nanocomposites with Ag in the size range of 5-15 nm diameter enchased in amorphous TiO₂ in the size range of 30-50 nm diameter in a typical synthesis. XRD results indicated that TiO₂ upon thermal treatments, gets converted to crystalline oxides. Both TiO₂ and Ag/TiO₂ nanoparticles prepared by our methods keep their anatase structures even above 700 ℃.Furthermore, SPS and XPS measurements indicate that Ag/TiO₂ nanoparticles have special structure instead of the simple mixture of Ag and TiO₂nanoparticles. The surface-enhanced Raman scattering activity of the hybrid nanoparticles was also investigated, and the results revealed their potential application in SERS substrate materials.

Key words: Ag; TiO₂; Hybrid nanoparticles; Surface-enhanced Raman scattering(SERS), Ag, TiO₂, Hybrid nanoparticles, Surface-enhanced Raman scattering(SERS)

CLC Number:

O614

TrendMD:

ZHANG Dan, ZHANG Rong-Wei, SONG Xi-Meng, ZHAO Da-Cheng, ZHANG Meng, LI Ying, LIU Feng-Qi. Preparation of Ag/TiO₂Hybrid Nanoparticles in W/O Emulsion and Its Surface-enhanced Raman Scattering Effect[J]. Chem. J. Chinese Universities, 2005, 26(12): 2203.

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Preparation of Ag/TiO₂Hybrid Nanoparticles in W/O Emulsion and Its Surface-enhanced Raman Scattering Effect

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