Synthesis of Au-SnO₂ nanocomposites by two-step laser ablation
by Ravi Kant Soni; Geetika Bajaj
International Journal of Nano and Biomaterials (IJNBM), Vol. 6, No. 1, 2015

Abstract: Au-SnO₂ nanocomposites have been synthesised by two-step laser ablation in liquid medium. The method involves synthesis of gold colloids followed by ablation of tin target in a freshly prepared gold colloidal solution. The effect of varying ablation time shows a decrease in average particle size and formation of core-shell structure. Optical absorption spectra of Au-SnO₂ exhibit a red-shift in the localised surface plasmon resonance (LSPR) peak of pure gold nanoparticle as a result of electron transfer from tin oxide to gold. The XPS of the Sn 3d peak of the sample confirms the formation of tin oxide. A negative shift in the binding energy of Au 4f peak in the XPS further confirms charge transfer process.

Online publication date: Wed, 25-Nov-2015

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