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Publications (2)5.49 Total impact

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    ABSTRACT: A novel composite was fabricated through dispersing multiwalled carbon nanotubes (MWNTs) in gold nanoparticle (GPs) colloid stabilized by chitosan and ionic liquid (i.e., 1-butyl-3-methylimidazolium tetrafluoroborate, BMIMBF4). Transmission electron microscopy (TEM) experiment showed that the GPs highly dispersed on the MWNTs probably due to the electrostatic interaction among GPs, MWNTs and the imidazolium cation of BMIMBF4. X-ray photoelectron spectroscopy (XPS) indicated that thus-formed gold nanostructure was mediated by BMIMBF4. When glucose oxidase (GOD) was immobilized on the composite (MWNTs-GPs) its ultraviolet-visible absorption spectrum kept almost unchanged. The immobilized GOD coated glassy carbon electrode (GOD/MWNTs-GPs/GC) exhibited a pair of well-defined peaks in 0.10 M pH 7.0 phosphate buffer solution (PBS), with a formal potential of −0.463 V (vs. SCE). The electrochemical process involved two-electron transfer. The electron transfer coefficient was ca.0.56 and the electron transfer rate constant was 9.36 s−1. Furthermore, the immobilized GOD presented good catalytic activity to the oxidation of glucose in air-saturated PBS. The Km and Im values were estimated to be 13.7 μM and 0.619 μA. The GOD/MWNTs-GPs/GC electrode displayed good stability and reproducibility.
    Electroanalysis 01/2009; 21(2):150 - 156. · 2.82 Impact Factor
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    ABSTRACT: A novel composite material comprised of gemini surfactant (i.e. dodecyl-α,ω-bis (dimethylcetylammonium bromide), C16–C12–C16) and hydrophobic room temperature ionic liquid (i.e. 1-octyl-3-methylimidazolium hexafluorophate, OMIMPF6) has been fabricated. This composite material suits for the immobilization of horseradish peroxides (HRP). The ultraviolet–visible spectra and reflectance absorption infrared spectra of the HRP immobilized in the C16–C12–C16–OMIMPF6 material are almost the same as those of native HRP. When it is coated on a glassy carbon (GC) electrode, the resulting electrode C16–C12–C16–OMIMPF6–HRP/GC exhibits a pair of well-defined, stable and reversible voltammetric peaks in 0.10 M pH 7 phosphate buffer solutions. When the hydrophobic action of ionic liquid and gemini surfactant used increases, more immobilized HRP can undergo electrochemical reaction and the voltammetric peaks become larger. In addition, the C16–C12–C16–OMIMPF6–HRP/GC electrode shows good catalytic response to dissolved oxygen and H2O2. The cathodic peak current of the electrode is linear to H2O2 concentration in the range of 5.82 μM to 388 μM. The apparent Michaelis–Menten constant is estimated to be 0.159 mM. The electrode has good stability and reproducibility. Hence, the composite material has potential applications in fabricating biosensors and bioelectronics.
    Journal of electroanalytical chemistry 02/2008; · 2.67 Impact Factor