Role of halide ions and temperature on the morphology of biologically synthesized gold nanotriangles

Rai, Akhilesh ; Singh, Amit ; Ahmad, Absar ; Sastry, Murali (2006) Role of halide ions and temperature on the morphology of biologically synthesized gold nanotriangles Langmuir, 22 (2). pp. 736-741. ISSN 0743-7463

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Official URL: http://pubs.acs.org/doi/abs/10.1021/la052055q

Related URL: http://dx.doi.org/10.1021/la052055q

Abstract

In this paper, we demonstrate the effect of halide ions on the formation of biogenically prepared gold nanotriangles using the leaf extract of lemongrass (Cymbopogon flexuosus) plant. We have also studied the effect of halide ions on the morphology of biogenic nanotriangles. It has been shown that iodide ions have a greater propensity to transform flat gold nanotriangles into circular disklike structures as compared to other halide ions. The study also suggests that the presence of Cl ions during the synthesis promotes the growth of nanotriangles, whereas the presence of I ions distorts the nanotriangle morphology and induces the formation of aggregated spherical nanoparticles. The change in the morphology of gold nanotriangles has been explained in terms of the ability of the halide ions to stabilize or inhibit the formation of (111) faces to form [111] oriented gold nanotriangles. Last, we have also shown that the temperature is an important parameter for controlling the aspect ratio and the relative amounts of gold nanotriangles and spherical particles. The results show that, by varying the temperature of reaction condition, the shape, size, and optical properties of anisotropic nanoparticles can be fine-tuned.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:47119
Deposited On:06 Jul 2011 14:23
Last Modified:06 Jul 2011 14:23

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