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Production of aqueous spherical gold nanoparticles using conventional ultrasonic bath

Ji-Hwan Lee1, Stephen U S Choi1, Seok Pil Jang2* and Seoung Youn Lee2

Author Affiliations

1 Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA

2 School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang, Gyeonggi-do, 412-791, Republic of Korea

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Nanoscale Research Letters 2012, 7:420  doi:10.1186/1556-276X-7-420

Published: 27 July 2012

Abstract

A conventional ultrasonic bath was used to examine the feasibility of forming aqueous spherical gold nanoparticles (GNPs) under atmospheric conditions. The effects of ultrasonic energy on the size and morphology of GNPs were also investigated. Highly monodispersed spherical GNPs were successfully synthesised by sodium citrate reduction in a conventional ultrasonic bath, without an additional heater or magnetic stirrer, as evidenced by ultraviolet–visible spectra and transmission electron microscopy. Ultrasonic energy was shown to be a key parameter for producing spherical GNPs of tunable sizes (20 to 50 nm). A proposed scheme for understanding the role of ultrasonic energy in the formation and growth of GNPs was discussed. The simple single-step method using just a conventional ultrasonic bath as demonstrated in this study offers new opportunities in the production of aqueous suspensions of monodispersed spherical GNPs.

Keywords:
Spherical gold nanoparticle; Ultrasonic bath; Ultrasonic energy