Authors: Shankar, S. Shiv; Bhargava, Suresh; Sastry, Murali

Source: Journal of Nanoscience and Nanotechnology, Volume 5, Number 10, October 2005 , pp. 1721-1727(7)

Publisher: American Scientific Publishers

Abstract:

Gold nanoparticles of triangular morphology possess interesting optical properties with potential application in medicine and infrared absorbing coatings, however, little is known about conditions that favor their growth. In this paper, we have reinvestigated a time-tested recipe for the formation of gold nanospheres by citrate reduction of aqueous gold ions under boiling conditions (Turkevich recipe). Our principle findings are that gold nanotriangle formation is kinetically controlled and is highly favored at low temperatures. Furthermore, the presence of chloride ions from the precursor chloroaurate ions plays a major role in promoting the growth of 111 oriented triangular/truncated triangular particles. The presence of bromide and iodide ions that possess the ability to replace surface-bound chloride ions inhibits triangle formation to varying degrees.

Keywords: NANOSPHERES; GOLD; NANOTRIANGLES; CRYSTAL GROWTH; HALIDES; TEMPERATURE EFFECT

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2005.192

Publication date: 2005-10-01

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• Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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