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RF reactive co-sputtered Au-Ag alloy nanoparticles in SiO 2 thin films

Sangpour, P ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apsusc.2007.03.050
  3. Publisher: Elsevier , 2007
  4. Abstract:
  5. We have studied formation of Au-Ag alloy nanoparticles in sputtered SiO 2 thin films. Silica thin films containing Au-Ag nanoparticles were deposited on quartz substrates using rf reactive magnetron co-sputtering technique. The films heat-treated in reducing Ar + H 2 atmosphere at different temperatures. They were analyzed by using UV-vis spectrophotometry, atomic force microscopy and X-ray photoelectron spectroscopy (XPS) methods for their optical, surface morphological as well as structural and chemical properties. The optical absorption of the Au-Ag alloy nanoparticles illustrated one plasmon resonance absorption peak located at 450 nm between the absorption bands of pure Au and Ag nanoparticles at 400 and 520 nm, respectively, for the thin films annealed at 800 °C. XPS results showed that the alloys were in metallic state, and they had a greater tendency to lose electrons as compared to their corresponding monometallic state. Using lateral force microscopy analysis, we have found that the alloy particles were uniformly distributed on the surface with grain size of about 20 nm. © 2007
  6. Keywords:
  7. Absorption spectra ; Atomic force microscopy ; Gold alloys ; Heat treatment ; Light absorption ; Magnetron sputtering ; Silica ; Substrates ; Surface morphology ; Thin films ; Ultraviolet spectroscopy ; X ray photoelectron spectroscopy ; Lateral force microscopy analysis ; Metallic state ; Monometallic state ; Resonance absorption ; Nanoparticles
  8. Source: Applied Surface Science ; Volume 253, Issue 18 , 2007 , Pages 7438-7442 ; 01694332 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0169433207004679?via%3Dihub