The electrochemical detection of dissolved ozone in water was examined using boron-doped diamond (BDD) electrodes. A well-defined reduction peak was observed at ~380 mV for H-terminated BDD, whereas it was observed at ~200 mV in the case of O-terminated BDD for ozone solution in a 0.1 M phosphate buffer solution at pH 7. The peak potential for ozone reduction was selective with respect to oxygen reduction at both H- and O-terminated BDD electrodes, whereas it occurred at approximately the same potential as oxygen reduction at other types of solid electrodes, including glassy-carbon, platinum, and gold electrodes. Interference from chlorine was not observed in lower concentration than 0.03 mM ClO-. Furthermore, in order to apply the detection technique to electrolyte-free media, BDD microelectrodes were also used. A linear calibration curve for dissolved ozone in water could be achieved between concentrations of 0.49 to 740 μM, with an estimated detection limit (S/N = 3) of 0.185 μM (S/N=3). Excellent stability was demonstrated for repetitions of these calibration curves performed in 3 consecutive days.
[Show abstract][Hide abstract] ABSTRACT: In an aggregated gold nanoparticle (AuNP) sol substrate, rhodamine S (RhS) exhibited a surface-enhanced Raman scattering (SERS) peak at 1503 cm−1. Based on the ozone oxidization and RhS-I3 particle reactions, 1.56-62.5 nmol L−1 of O3 can be determined by SERS, with a detection limit of 0.9 nmol L−1.
[Show abstract][Hide abstract] ABSTRACT: N3 dye molecules [cis-bis(isothiocyanato)-bis(2,2'-bipyridyl-4,4'-dicarboxylato)-ruthenium(II)] are covalently attached onto boron-doped nanocrystalline diamond (B:NCD) thin films through a combination of coupling chemistries, i.e. diazonium, Suzuki and EDC-NHS. X-ray and ultraviolet photoelectron spectroscopy (XPS and UPS), and near-edge X-ray absorption fine structure spectroscopy (NEXAFS) are used to verify the covalent bonding of the dye on the B:NCD surface (as compared to a hydrogen-terminated reference). The spectroscopic results confirm the presence of a dense N3 chromophore layer and the positions of the frontier orbitals of the dye relative to the band edge of the B:NCD thin film are inferred as well. Proof of concept photoelectrochemical measurements show a strong increase in photocurrent as compared to non-dye-functionalized B:NCD films. This study opens up the possibility to apply N3-sensitized B:NCD thin films as hole conductors in dye-sensitized solar cells.
[Show abstract][Hide abstract] ABSTRACT: Ozone unexpectedly dramatically suppresses the electrochemiluminescence (ECL) of Ru(phen)3(2+)/glyoxal at an ozone/glyoxal ratio of less than 0.5%. Moreover, a sensitive, simple and fast ECL method for ozone detection is developed, with a detection time within 1 min and a limit of detection of 20 nM.
Chemical Communications 06/2014; 50(60). DOI:10.1039/c4cc01605j · 6.83 Impact Factor
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