title: Ultrasensitive voltammetric determination of catechol at a gold atomic cluster/poly(3,4-ethylenedioxythiophene) nanocomposite electrode.
abstract: A novel gold atomic cluster-poly(3,4-ethylenedioxythiophene) (AuAC/PEDOT/Au) nanocomposite modified gold electrode has been designed for the trace level sensing of catechol. The addition of copper(II) enhanced the electro-catalytic oxidation of catechol via the formation of copper(I). The electrochemically synthesized PEDOT/Au and the AuAC/PEDOT/Au hybrid films were characterized by electrochemical and morphological methods. Under optimal conditions the nanocomposite modified electrode offers a wider calibration range of 1 × 10(-4) to 10 μM with a lowest detection limit of 6.3 pM for catechol. Moreover, the developed electrochemical sensor exhibited good selectivity and acceptable reproducibility (1.23% for 1 nM of catechol) and could be used for the routine detection and quantification of catechol in natural water samples. To gain a better understanding of such an excellent sensor performance achieved with this electrode, studies were undertaken to pinpoint electrode kinetics of charge transfer processes.
authors.affiliation: Chemical Sciences & Technology Division (CSTD), CSIR-National Institute for Interdisciplinary Science & Technology (CSIR-NIIST), Trivandrum 695019, India.
authors.forename: Sindhu R
authors.initials: SR
authors.lastname: Nambiar
authors.forename: Padamadathil K
authors.initials: PK
authors.lastname: Aneesh
authors.forename: Talasila P
authors.initials: TP
authors.lastname: Rao
mesh_terms: D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry*; D002384:Catalysis; D002396:Catechols / Q000032:analysis* / Q000737:chemistry*; D003300:Copper / Q000737:chemistry; D004563:Electrochemistry / Q000191:economics / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D007700:Kinetics; D053761:Nanocomposites / Q000737:chemistry*; D010084:Oxidation-Reduction; D011108:Polymers / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D019086:Bridged Bicyclo Compounds, Heterocyclic; D002396:Catechols; D011108:Polymers; C121383:poly(3,4-ethylene dioxythiophene); D014867:Water; D006046:Gold; D003300:Copper; C034221:catechol