Dawang Yu

Shanghai University, Shanghai, Shanghai Shi, China

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Publications (2)1.84 Total impact

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    ABSTRACT: ZnS nanoparticles were prepared by hydrothermal method and modified with mercaptoacetic acid in this paper. The functionalized nanoparticles were characterized using transmission electron microscopy (TEM), X-ray diffractometer (XRD) and photoluminescence spectroscopy. They were used as fluorescence probes in the determination of uracil and thymine. Under the optimum conditions, the fluorescence of functionalized ZnS nanoparticles was quenched by uracil and thymine, respectively. The responses are linearly proportional to the concentrations of uracil and thymine both between 0.8×10−5 and 9.6×10−5molL−1and the limits of detection are 0.9×10−6 and 0.4×10−5molL−1 for uracil and thymine, respectively.
    Materials Chemistry and Physics - MATER CHEM PHYS. 01/2009; 113(2):905-908.
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    ABSTRACT: A novel electrochemical sensor has been constructed by using a glassy carbon electrode (GCE) coated with nafion/sodium dodecylbenzenesulfonate (SDBS). Differential pulse voltammetry (DPV) was used to study the electrochemical behaviors of dopamine (DA) and uric acid (UA). An optimum of 5mM SDBS together with 0.05wt% of nafion was used to improve the resolution and the determination sensitivity successfully. In 0.1M phosphate buffer solution (pH 6.5), the modified electrode exhibited high electrocatalytical activity toward the oxidation of DA and UA with obvious reduction of overpotential. Compared with bare GCE, the modified electrode resolved the voltammetric response of DA and UA into two well-defined voltammetric peaks by DPV, which can be used for simultaneous determination of these species in mixture. The peak currents obtained from DPV were linearly related to the concentrations of DA and UA in the ranges of 4.0×10−7–8.0×10−5M and 4.0×10−6–8.0×10−4M, respectively. The detection limit of DA and UA (signal-to-noise ration was 3) were 5.0×10−8 and 4.0×10−7M, respectively.
    Journal of Applied Electrochemistry 39(9):1603-1608. · 1.84 Impact Factor