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Issue 12, 2009
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Development of a chromium speciation probe based on morphology-dependent aggregation of polymerized vesicle-functionalized gold nanoparticles

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Abstract

In this work, a new approach for visual sensing of Cr3+ in aqueous solutions is presented, based on the morphological changes induced by Cr3+ on (4-carboxybenzyl)bis[2-(undec-10-enyloxycarbonyl)ethyl]methylammonium bromide (4-CBUAB)-polymerized vesicles. CTAB-stabilized gold nanoparticles (GNPs) react with 4-CBUAB-polymerized vesicles to form aggregates viavesicle–micelle interactions, which does not proceed further because of vesicle–vesicle repulsive forces, creating a large polymerized vesicle–gold nanoparticle (PV–GNP) conjugate. The incorporation of Cr3+ through the 4-CBUAB polymeric membrane induces structural perturbations on the polymerized vesicle morphology by swelling of the lamellar phase which is reflected in the morphology of the polymerized vesicle–gold nanoparticle conjugate assembly. These steric perturbations induce a linear increase in the absorbance of the solutions as a function of Cr3+ concentration, a feature which was exploited for the analytical determination of Cr3+ in real samples. Owing to the high selectivity of the polymerized vesicular aggregate no interferences from co-existing species were observed, enabling the determination and speciation of Cr3+ in real samples with minimal sample pre-treatment and without preconcentration. The analytical merits afford detection limits as low as 0.72 µg L−1 by extracting only 5 mL of sample volume with satisfactory reproducibility (RSD = 5.21%, C = 10 µg L−1, n = 6), which are directly comparable to those attained with more sophisticated techniques.

Graphical abstract: Development of a chromium speciation probe based on morphology-dependent aggregation of polymerized vesicle-functionalized gold nanoparticles

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Supplementary files

Article information


Submitted
14 May 2009
Accepted
14 Oct 2009
First published
23 Oct 2009

Analyst, 2009,134, 2475-2483
Article type
Paper

Development of a chromium speciation probe based on morphology-dependent aggregation of polymerized vesicle-functionalized gold nanoparticles

N. I. Kapakoglou, D. L. Giokas, G. Z. Tsogas, A. K. Ladavos and A. G. Vlessidis, Analyst, 2009, 134, 2475
DOI: 10.1039/B909619A

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