Synthesis of Au, Ag, Curcumin Au/Ag, and Au-Ag Nanoparticles and Their Nonlinear Refractive Index Properties

F Abdulwahab,F Z Henari,K Winser,S Cassidy

doi:10.1155/2016/5356404

F Abdulwahab, F Z Henari + Show 2 more

Open Access

https://doi.org/10.1155/2016/5356404

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Abstract

Nanoparticles of gold and silver were prepared by a reduction method and by employing green chemistry principles such as using curcumin as a reducing and a stabilizing agent. The formation of nanoparticles was confirmed by UV-Vis absorption spectra and TEM. Mie theory was used to determine the particle sizes. The nonlinear refraction and absorption properties of the particles were measured using the z-scan technique. A large value of third-order nonlinearities was obtained using the nanoparticles produced.

Highlights

Metallic nanoparticles have attracted a huge interest because their physical and chemical properties are different from those of their bulks [1]
In this paper we report the nonlinear behavior of gold, silver, curcumin-gold, curcumin-silver, and silver-gold nanoparticles which were prepared by the chemical reduction method and green synthesis
The nonlinear refractive index and nonlinear absorption of these samples were measured using the z-scan technique with cw argon-ion laser beam at 488 nm and 514 nm

Summary

Introduction

Metallic nanoparticles have attracted a huge interest because their physical and chemical properties are different from those of their bulks [1]. Metallic nanoparticles form district energy levels, which are shown in the linear absorption spectra by a broad band absorption This manifests as surface plasmon resonance, which does not exist in the case of bulk materials. The collective oscillation of excited electrons in the conduction band known as surface plasmon resonance (SPR) and the surface area to volume ratio leads to a strong interaction with the incoming electromagnetic wave to enhance the local field, boosting the nonlinear optical properties of these materials. The optical properties of nanoparticles are strongly dependent on the particle size and shape and dielectric properties of the matrix. Journal of Nanomaterials properties was measured with different synthesis methods and found to have no relationship between the values of the nonlinearities and the synthesis method

Synthesis of Nanoparticles

Results and Discussions

Conclusions