TY - JOUR
T1 - Modification of glassy carbon electrode with a polymer/mediator composite and its application for the electrochemical detection of iodate
AU - Li, Ta Jen
AU - Lin, Chia Yu
AU - Balamurugan, A.
AU - Kung, Chung Wei
AU - Wang, Jen Yuan
AU - Hu, Chih Wei
AU - Wang, Chun Chieh
AU - Chen, Po Yen
AU - Vittal, R.
AU - Ho, Kuo Chuan
N1 - Funding Information:
This work is supported by the National Science Council (NSC) of Taiwan under grant numbers NSC 99-2221-E-002-183 and NSC 100-2221-E-002-204 .
PY - 2012/8/6
Y1 - 2012/8/6
N2 - A modified glassy carbon electrode was prepared by depositing a composite of polymer and mediator on a glassy carbon electrode (GCE). The mediator, flavin adenine dinucleotide (FAD) and the polymer, poly(3,4-ethylenedioxythiophene) (PEDOT) were electrochemically deposited as a composite on the GCE by applying cyclic voltammetry (CV). This modified electrode is hereafter designated as GCE/PEDOT/FAD. FAD was found to significantly enhance the growth of PEDOT. Electrochemical quartz crystal microbalance (EQCM) analysis was performed to study the mass changes in the electrode during the electrodeposition of PEDOT, with and without the addition of FAD. The optimal cycle number for preparing the modified electrode was determined to be 9, and the corresponding surface coverage of FAD (Γ FAD) was ca. 5.11×10 -10molcm -2. The amperometric detection of iodate was performed in a 100mM buffer solution (pH 1.5). The GCE/PEDOT/FAD showed a sensitivity of 0.78μAμM -1cm -2, a linear range of 4-140μM, and a limit of detection of 0.16μM for iodate. The interference effects of 250-fold Na +, Mg 2+, Ca 2+, Zn 2+, Fe 2+, Cl -, NO 3 -, I -, SO 4 2- and SO 3 2-, with reference to the concentration of iodate were negligible. The long-term stability of GCE/PEDOT/FAD was also investigated. The GCE/PEDOT/FAD electrode retained 82% of its initial amperometric response to iodate after 7 days. The GCE/PEDOT/FAD was also applied to determine iodate in a commercial salt.
AB - A modified glassy carbon electrode was prepared by depositing a composite of polymer and mediator on a glassy carbon electrode (GCE). The mediator, flavin adenine dinucleotide (FAD) and the polymer, poly(3,4-ethylenedioxythiophene) (PEDOT) were electrochemically deposited as a composite on the GCE by applying cyclic voltammetry (CV). This modified electrode is hereafter designated as GCE/PEDOT/FAD. FAD was found to significantly enhance the growth of PEDOT. Electrochemical quartz crystal microbalance (EQCM) analysis was performed to study the mass changes in the electrode during the electrodeposition of PEDOT, with and without the addition of FAD. The optimal cycle number for preparing the modified electrode was determined to be 9, and the corresponding surface coverage of FAD (Γ FAD) was ca. 5.11×10 -10molcm -2. The amperometric detection of iodate was performed in a 100mM buffer solution (pH 1.5). The GCE/PEDOT/FAD showed a sensitivity of 0.78μAμM -1cm -2, a linear range of 4-140μM, and a limit of detection of 0.16μM for iodate. The interference effects of 250-fold Na +, Mg 2+, Ca 2+, Zn 2+, Fe 2+, Cl -, NO 3 -, I -, SO 4 2- and SO 3 2-, with reference to the concentration of iodate were negligible. The long-term stability of GCE/PEDOT/FAD was also investigated. The GCE/PEDOT/FAD electrode retained 82% of its initial amperometric response to iodate after 7 days. The GCE/PEDOT/FAD was also applied to determine iodate in a commercial salt.
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U2 - 10.1016/j.aca.2012.05.053
DO - 10.1016/j.aca.2012.05.053
M3 - Article
C2 - 22769036
AN - SCOPUS:84863455630
SN - 0003-2670
VL - 737
SP - 55
EP - 63
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
ER -