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Polyaniline-iron oxide nanohybrid film as multi-functional label-free electrochemical and biomagnetic sensor for catechol

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Title Polyaniline-iron oxide nanohybrid film as multi-functional label-free electrochemical and biomagnetic sensor for catechol
 
Creator CHANDRA, S
LANG, H
BAHADUR, D
 
Subject PANI-iron oxide nanohybrid
Spectroelectrochemistry
Impedance
Biomagnetic
Catechol
THERAPEUTIC APPLICATIONS
MODIFIED ELECTRODE
COMPOSITES
ELECTROCATALYSIS
NANOCOMPOSITES
NANOPARTICLES
HYDROQUINONE
OXIDATION
GROWTH
ARRAYS
 
Description Polyaniline-iron oxide magnetic nanohybrid was synthesized and characterized using various spectroscopic, microstructural and electrochemical techniques. The smart integration of Fe3O4 nanoparticles within the polyaniline (PANI) matrix yielded a mesoporous nanohybrid (Fe3O4@PANI) with high surface area (94 m(2) g(-1)) and average pore width of 12.8 nm. Catechol is quasi-reversibly oxidized to o-quinone and reduced at the Fe3O4@PANI modified electrodes. The amperometric current response toward catechol was evaluated using the nanohybrid and the sensitivity and detection limit were found to be 312 mu A mu L-1 and 0.2 nM, respectively. The results from electrochemical impedance spectroscopy (EIS) indicated that the increased solution resistance (R-s) was due to elevated adsorption of catechol on the modified electrodes. Photoluminescence spectra showed ligand-to-metal charge transfer (LMCT) between p-pi orbitals of the phenolate oxygen in catechol and the d-sigma* metal orbital of Fe3O4@PANI nanohybrid. Potential dependent spectroelectrochemical behavior of Fe3O4@PANI nanohybrid toward catechol was studied using UV/vis/NIR spectroscopy. The binding activity of the biomagnetic particles to catechol through Brownian relaxation was evident from AC susceptibility measurements. The proposed sensor was used for successful recovery of catechol in tap water samples. (C) 2013 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2014-10-16T15:35:48Z
2014-10-16T15:35:48Z
2013
 
Type Article
 
Identifier ANALYTICA CHIMICA ACTA, 7958-14
http://dx.doi.org/10.1016/j.aca.2013.07.043
http://dspace.library.iitb.ac.in/jspui/handle/100/15918
 
Language en