Title: Synthesis of Au-SnO2 nanocomposites by two-step laser ablation

Authors: Ravi Kant Soni; Geetika Bajaj

Addresses: Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India ' Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India

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.

Keywords: pulsed laser ablation; liquid; core-shell structure; LSPR; localised surface plasmon resonance; XPS; Au-SnO2 nanocomposites; tin oxide; gold colloids; gold nanoparticles; nanotechnology; binding energy.

DOI: 10.1504/IJNBM.2015.073146

International Journal of Nano and Biomaterials, 2015 Vol.6 No.1, pp.52 - 61

Available online: 20 Nov 2015 *

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