title: Photoelectrochemical oxygen sensor using copper-plated screen-printed carbon electrodes.
abstract: We report here an efficient photocatalytic amperometric sensor for the determination of dissolved oxygen (DO) in phosphate buffer solution using a disposable copper-plated screen-printed carbon electrode (CuSPE). The photoelectrochemical activity toward DO of the CuSPE was related to the formation of a p-type semiconductor Cu(I)2O. The solution pH and biased potential (E(bias)) were systematically optimized as pH 8 PBS and -0.7 V vs Ag/AgCl, respectively. Under optimized conditions, the calibration plot was linear in the range of 1-8 ppm with sensitivity and regression coefficient of 23.51 (microA cm2)(-1) ppm(-1) and 0.9982, respectively. The reproducibility of the system was good with seven successive measurements of DO yielding a RSD value of 1.87%. Real sample assays for groundwater and tap water were also consistent with those measured by a commercial DO meter. The principle used in DO measurement has an opportunity to extend into various research fields.
authors.forename: Jyh-Myng
authors.initials: JM
authors.lastname: Zen
authors.forename: Yue-Shian
authors.initials: YS
authors.lastname: Song
authors.forename: Hsieh-Hsun
authors.initials: HH
authors.lastname: Chung
authors.forename: Cheng-Teng
authors.initials: CT
authors.lastname: Hsu
authors.forename: Annamalai Senthil
authors.initials: AS
authors.lastname: Kumar
mesh_terms: D002244:Carbon; D003300:Copper; D004563:Electrochemistry / Q000295:instrumentation / Q000592:standards; D004566:Electrodes / Q000592:standards; D010100:Oxygen / Q000032:analysis*; D010777:Photochemistry / Q000295:instrumentation / Q000592:standards; D014867:Water / Q000032:analysis*
chemical_list: D014867:Water; D002244:Carbon; D003300:Copper; D010100:Oxygen