Composite PEDOT/Au Nanoparticles Modified Electrodes for Determination of Mercury at Trace Levels by Anodic Stripping Voltammetry

Abstract

Electrode modifications consisting of poly(3,4-ethylenedioxythiophene) (PEDOT), including gold nanoparticles according to simple though innovative procedure, are developed. The resulting nanocomposite shows interesting performances as electrode material for determination of mercury by anodic stripping technique, even down to concentration levels as low as 0.46 ng/ml. The analytical performance is evaluated by optimized experimental parameters such as the charge spent during the potentiostatic electrodeposition of PEDOT, the preconcentration time, and the waveform parameters for the Differential Pulse Voltammetry (DPV) redissolution scan. No evidence of significant oxidative degradation of the polymer over repeated analysis cycles is evidence

Highly Selective Mercury Detection at Partially Oxidized Graphene/Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) Nanocomposite Film-Modified Electrode

“…Amalgam formation on the electrode surface affects reproducibility of analytical response. It is necessary to regenerate or activate the electrode surface each time with ethylenediaminetetraacetic acid (Giannetto et al, 2011). Electrochemical response of Hg 2+ at po-Gr/PEDOT:PSS-modified GCE is not dependent on amalgam formation, so it offers reproducible measurements without the need for regeneration or electrode activation.…”

“…Some electrochemical methods for sensing Hg use the conjugation of functional groups, such as the donor ligands of nitrogen (N) or sulfur (S) present in amino acids or conducting polymers, such as poly (3,4-ethylenedioxythiophene) (PEDOT), which have a strong binding preference for Hg 2+ (Chow and Gooding, 2006;Giannetto et al, 2011;Anandhakumar et al, 2012). In the case of www.frontiersin.org PEDOT, although it contains S, which can endow two unpaired electrons, it may not be possible to use PEDOT by itself due to the low signal sensitivity, high insolubility, and intractability (MartinYerga et al, 2013).…”

Hydroxylation/carbonylation carbonaceous microspheres: A route without the need for an external functionalization to a “hunter” of lead(II) for electrochemical detection

“…Examples include ethylenediamine for Cu 2+ [1], cryptand [2.2.1] for Bi 3+ [2], fluorination for Cu 2+ [3], polyaniline for Pb 2+ [4], thiol functionalized chitosan for Hg 2+ and Cu 2+ [5,6], sodium dodecyl benzene sulfonate (NaDBS) for Cd 2+ and Zn 2+ [7], and 1-(2-pyridylazo)-2-naphthol for Pb 2+ [8]. Recently, chemisorbed organosulfur self-assembled monolayers (SAM) on a gold surface have received much attention [9][10][11][12][13][14][15][16][17][18][19][20][21]. Typically, SAMs of l-cysteine are used for the adsorptive stripping analysis of copper.…”

Gold Nanoparticles and [PEDOT-Poly(D,L-Lactic Acid)] Composite: Synthesis, Characterization and Application to H2O2 Sensing

“…Nanocomposites of gold nanoparticles with PEDOT have been deeply studied as electrochromic layer for electrochromic devices. [12][13][14][15][16][17][18][19][20][21][22][23][24][25] A relatively new class of materials are the biodegradable conducting polymers with biocompatible properties suitable for biomedical applications in living cells, bacteria and live organisms. 26 Several polymers combinations and inorganic/organic composites have been synthesized and described for this purpose.…”