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Synthesis and photo physical properties of Au @ Ag (core @ shell) nanoparticles disperse in poly vinyl alcohol matrix

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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.

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Acknowledgements

We gratefully acknowledge the financial support received from CSIR, New Delhi for carrying out this research work. S. Pyne and P. Sarkar thank CSIR, New Delhi for their individual fellowship. The support rendered by the Central Research Facility at IIT Kharagpur, India for carrying out HRTEM study is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore, 721102, WB, India

    Santanu Pyne, Priyanka Sarkar, Gobinda Prasad Sahoo, Dipak Kumar Bhui, Harekrishna Bar & Ajay Misra

  2. Chemical Science Division, Saha Institute of Nuclear Physics, A/F Block, Saltlake, Kolkata, 700064, WB, India

    Samita Basu

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  1. Santanu Pyne
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  2. Priyanka Sarkar
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Correspondence to Ajay Misra.

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Pyne, S., Sarkar, P., Basu, S. et al. Synthesis and photo physical properties of Au @ Ag (core @ shell) nanoparticles disperse in poly vinyl alcohol matrix. J Nanopart Res 13, 1759–1767 (2011). https://doi.org/10.1007/s11051-010-9955-9

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