High-Temperature Seedless Synthesis of Gold Nanorods

Peter Zijlstra,* Craig Bullen, James W. M. Chon,* and Min Gu
Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, P.O. Box 218, Hawthorn, 3122 VIC, Australia
J. Phys. Chem. B, 2006, 110 (39), pp 19315–19318
DOI: 10.1021/jp0635866
Publication Date (Web): September 12, 2006
Copyright © 2006 American Chemical Society
*

 Corresponding authors. E-mail:  PZijlstra@swin.edu.au (P.Z.); JChon@ groupwise.swin.edu.au (J.W.M.C.).

Abstract

We demonstrate seedless synthesis of gold nanorods at high temperatures up to 97 °C. Using the correct silver nitrate concentration is crucial for formation of rod-shaped particles at all temperatures. We observed a decrease of nanorod length with increasing temperature, while the width stays constant throughout the temperature range. From kinetics studies, we show 3 orders of magnitude increase in nanorod growth rate when the temperature is raised from room temperature to 97 °C. From the temperature dependence of the growth rate, we obtain a average activation energy for growth on all facets of 90 ± 10 kJ mol-1. High-temperature synthesis of gold nanorods presents a more attractive method for scalable flow-based production of gold nanorods.

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History

  • Published In Issue October 05, 2006
  • Received June 8, 2006
    Revised August 1, 2006

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