Nano Archive

Functionalization of Ag nanoparticles with the bis-acridinium lucigenin as a chemical assembler in the detection of persistent organic pollutants by surface-enhanced Raman scattering

Guerrini, L and Aliaga, A. E. and Carcamo, J and Gomez-Jeria, J. S. and Sanchez-Cortes, S and Campos-Vallette, M. M. and Garcia-Ramos, J. V. (2008) Functionalization of Ag nanoparticles with the bis-acridinium lucigenin as a chemical assembler in the detection of persistent organic pollutants by surface-enhanced Raman scattering. ANALYTICA CHIMICA ACTA, 624 (2). pp. 286-293.

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Official URL: http://dx.doi.org/10.1016/j.aca.2008.06.038

Abstract

Organochlorine pesticide endosulfan has been detected for the first time by using surface-enhanced Raman scattering (SERS) at trace concentrations. The bis-acridinium dication lucigenine was successfully used as a molecular assembler in the functionalization of metal nanoparticles to facilitate the approach of the pesticide to the metal surface. From the SERS spectra valuable information about the interaction mechanism between the pesticide and lucigenin can be deduced. In fact, endosulfan undergoes an isomerization upon adsorption onto the metal, while the viologen undergoes a rotation of the acridinium planes to better accommodate the pesticide molecule. An interaction between the N atom of the central acridinium ring and the pesticide Cl-C=C-Cl fragment is verified through a charge-transfer complex. The present study affords important information which can be applied to the design of chemical sensor systems of persistent organic pollutants based on the optical detection on functionalized metal nanoparticle. (c) 2008 Elsevier B.V. All rights reserved.

Item Type:Article
Uncontrolled Keywords:metal functionalization; viologen; lucigenin; molecular recognition; surface-enhanced Raman scattering; nanosensors; organochlorine pesticides
Subjects:Physical Science > Nano objects
Analytical Science > Nanotechnology for sensing and actuating
Material Science > Nanochemistry
ID Code:1208
Deposited By:Anuj Seth
Deposited On:16 Dec 2008 13:55
Last Modified:18 Feb 2009 17:48

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