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  • Title: Plasma-induced formation of Ag nanodots for ultra-high-enhancement surface-enhanced Raman scattering substrates.
    Author: Li Z, Tong WM, Stickle WF, Neiman DL, Williams RS, Hunter LL, Talin AA, Li D, Brueck SR.
    Journal: Langmuir; 2007 Apr 24; 23(9):5135-8. PubMed ID: 17385901.
    Abstract:
    We report here plasma-induced formation of Ag nanostructures for surface-enhanced Raman scattering (SERS) applications. An array of uniform Ag patterned structures of 150 nm diameter was first fabricated on a silicon substrate with imprint lithography; then the substrate was further treated with an oxygen plasma to fracture the patterned structures into clusters of smaller, interconnected, closely packed Ag nanoparticles (20-60 nm) and redeposited Ag nanodots ( approximately 10 nm) between the clusters. The substrate thus formed had a uniform ultrahigh SERS enhancement factor (1010) over the entire substrate for 4-mercaptophenol molecules. By comparison, Au patterned structures fabricated with the same method did not undergo such a morphological change after the plasma treatment and showed no enhancement of Raman scattering.
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