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Journal of Sol-Gel Science and Technology

, Volume 67, Issue 3, pp 527–533 | Cite as

Preparation and nonlinear optical properties of Au nanoparticles doped TiO2 thin films

  • Jianzi Li
  • Yanmei Gong
  • Jian Xu
  • Gongping Wang
  • Gang Fang
Original Paper

Abstract

Nano-sized noble metal nanoparticles doped dielectric composite films with large third-order nonlinear susceptibility due to the confinement and the enhancement of local field were considered to be applied for optical information processing devices, such as optical switch or all optical logical gates. In this paper, sol–gel titania thin films doped with gold nanoparticles (AuNPs, ~10 nm in average size) were prepared. AuNPs were firstly synthesized from HAuCl4 in aqueous solution at ~60 °C, using trisodium citrate as the reducing agent, polyvinylpyrrolidone as the stable agent; then the particle size and optical absorption spectra of the AuNPs in aqueous solutions were characterized by transmitting electron microscopy and UV–Vis–NIR spectrometry. Sol–gel 2AuNPs–100TiO2 (in %mol) thin films (5 layers, ~1 μm in thickness) were deposited on silica glass slides by multilayer dip-coating. After heat-treated at 300–1,000 °C in air, the AuNPs–TiO2 thin films were investigated by X-ray diffraction, scanning electron microscopy and atomic force microscopy. The nonlinear optical properties of the AuNPs–TiO2 thin films were measured with the Z-scan technique, using a femtosecond laser (200 fs) at the wavelength of 800 nm. The third-order nonlinear refractive index and nonlinear absorption coefficient of 2AuNPs–100TiO2 films were at the order of 10−12 cm2/W, and the order of 10−6 cm/W, respectively, and the third-order optical nonlinear susceptibility χ(3) was ~6.88 × 10−10 esu.

Keywords

Thin films Sol–gel process Nonlinear optical property Gold nanoparticles TiO2 

Notes

Acknowledgments

The authors thank MOST (2006DFA52910), NSFZhejiang (LY12F04001) for the financial support. This work is also sponsored by K.C.Wong Magna Fund in Ningbo University and the graduate student project (G12JA034) of Ningbo University.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Jianzi Li
    • 1
  • Yanmei Gong
    • 1
  • Jian Xu
    • 1
  • Gongping Wang
    • 2
  • Gang Fang
    • 1
  1. 1.College of Information Science and EngineeringNingbo UniversityNingboChina
  2. 2.Zhejiang Vocational Academy of ArtHangzhouChina

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