Abstract
Synthesis of core @ shell (Au @ Ag) nanoparticle with varying silver composition has been carried out in aqueous poly vinyl
alcohol (PVA) matrix. Core gold nanoparticle (~15 nm) has been synthesized through seed-mediated growth process. Synthesis
of silver shell with increasing thickness (~1–5 nm) has been done by reducing Ag+ over the gold sol in the presence of mild reducing ascorbic acid. Characterization of Au @ Ag nanoparticles has been done
by UV–Vis, High resolution transmission electron microscope (HRTEM) and energy dispersive X-ray (EDX) spectroscopic study.
The blue shift of surface plasmon resonance (SPR) band with increasing mole fraction of silver has been interpreted due to
dampening of core, i.e. Au SPR by Ag. The dependence of nonlinear optical response of spherical core @ shell nanoparticles
has been investigated as a function of relative composition of each metal. Simulation of SPR extinction spectra based on quasi-static
theory is done. A comparison of our experimental and the simulated extinction spectra using quasi-static theory of nanoshell
suggests that our synthesized bimetallic particles have core @ shell structure rather than bimetallic alloy particles.
alcohol (PVA) matrix. Core gold nanoparticle (~15 nm) has been synthesized through seed-mediated growth process. Synthesis
of silver shell with increasing thickness (~1–5 nm) has been done by reducing Ag+ over the gold sol in the presence of mild reducing ascorbic acid. Characterization of Au @ Ag nanoparticles has been done
by UV–Vis, High resolution transmission electron microscope (HRTEM) and energy dispersive X-ray (EDX) spectroscopic study.
The blue shift of surface plasmon resonance (SPR) band with increasing mole fraction of silver has been interpreted due to
dampening of core, i.e. Au SPR by Ag. The dependence of nonlinear optical response of spherical core @ shell nanoparticles
has been investigated as a function of relative composition of each metal. Simulation of SPR extinction spectra based on quasi-static
theory is done. A comparison of our experimental and the simulated extinction spectra using quasi-static theory of nanoshell
suggests that our synthesized bimetallic particles have core @ shell structure rather than bimetallic alloy particles.
- Content Type Journal Article
- Category Research Paper
- DOI 10.1007/s11051-010-9955-9
- Authors
- Santanu Pyne, Vidyasagar University Department of Chemistry and Chemical Technology Midnapore 721102 WB India
- Priyanka Sarkar, Vidyasagar University Department of Chemistry and Chemical Technology Midnapore 721102 WB India
- Samita Basu, Saha Institute of Nuclear Physics Chemical Science Division A/F Block, Saltlake Kolkata 700064 WB India
- Gobinda Prasad Sahoo, Vidyasagar University Department of Chemistry and Chemical Technology Midnapore 721102 WB India
- Dipak Kumar Bhui, Vidyasagar University Department of Chemistry and Chemical Technology Midnapore 721102 WB India
- Harekrishna Bar, Vidyasagar University Department of Chemistry and Chemical Technology Midnapore 721102 WB India
- Ajay Misra, Vidyasagar University Department of Chemistry and Chemical Technology Midnapore 721102 WB India
- Journal Journal of Nanoparticle Research
- Online ISSN 1572-896X
- Print ISSN 1388-0764
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