Synthesis of Au-SnO2 nanocomposites by two-step laser ablation. (2015)

• Record Type: Journal Article
• Authors: Soni, Ravi Kant; Bajaj, Geetika
• Is Part Of: International journal of nano and biomaterials. Volume 6:Number 1(2015)
• Page Start: 52
• Page End: 61
• Publication Date: 2015
• Subjects: 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; Nanostructured materials -- Periodicals; Nanotechnology -- Periodicals; Biomedical materials -- Periodicals; 620.505
• Languages: English
• ISSNs: 1752-8933

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.