Compositional analysis of atom beam co-sputtered metal-silica nanocomposites by Rutherford backscattering spectrometry

摘要

Metal:SiO_2 (metal: Ni, Ag, Au) nanocomposite films of different compositions have been prepared by atom beam co-sputtering. The estimation of composition of films is done theoretically using sputtering yield and relative area of metal and SiO_2. The sputtering yields used for estimation of composition are calculated by three theoretical methods: Monte Carlo simulations (SRIM code), Sigmund's theory and Sigmund's theory modified by Anderson and Bay. Rutherford backscattering spectrometry (RBS) is also used to analyze the composition of the nanocomposite films. RUMP simulations of RBS data are performed. The errors in theoretical calculations and RBS results are estimated. It is found that SRIM is more appropriate for Ni:SiO_2 nanocomposite films, while modified Sigmund's theory based method is better for Ag:SiO_2 and Au:SiO_2 nanocomposite films. The possible sources of errors in theoretical methods with respect to experimental (RBS) results are also discussed.