Abstract
In this account, [BMIM]6P2Mo18O62 hybrid material was further characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Raman spectroscopy. XRD illustrated that compared to the parent K6P2Mo18O62·nH2O, where 92 % of the structure is crystalline, 84 % of the structure of [BMIM]6P2Mo18O62 hybrid material is fine-grain amorphous and only 16 % is crystalline. This was attributed to the replacement of most of the protons and constitution water molecules in K6P2Mo18O62·nH2O by [BMIM]+ cations. TEM showed that K6P2Mo18O62·nH2O has uniform and spherical nanoparticles with an average diameter of ~100 nm. However, the hybrid material displayed less uniform morphology with spherical and variously shaped nanoparticles with diameters varying from ~10 to 100 nm. Raman spectroscopy of [BMIM]6P2Mo18O62 illustrated that peaks of the Dawson [P2Mo18O62]6− unit in [BMIM]6P2Mo18O62 hybrid material are not obvious due to the overlap with the peaks of [BMIM]+. The latter was related to the large number of [BMIM]+ cations surrounding the Dawson unit in the hybrid material. [BMIM]6P2Mo18O62 was immobilized on glassy carbon electrode and studied by electrochemistry. Linear sweep voltammetry illustrated that unlike the parent polyoxoanion [P2Mo18O62]6− which showed no particular catalytic activity towards the oxidation of the NADH coenzyme, the hybrid material [BMIM]6P2Mo18O62 is found to efficiently catalyze the oxidation of the NADH coenzyme at low overpotentials. Amperometry revealed high sensitivities (~1.97 μA mM−1 mm−2) and extended linearity (~9.1 mM) of [BMIM]6P2Mo18O62/GC electrode towards the oxidation of the NADH coenzyme.
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Acknowledgments
This work was supported by the Natural Sciences and Engineering Research Council of Canada, and UOIT. We thank Dr. Ranganathan Santhanam (UOIT) for assistance with Raman, Dr. Richard B. Gardiner (University of Western Ontario) for TEM, and Wen He Gong (McMaster University) for XRD.
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Ammam, M., Easton, E.B. Hybrid material based on 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid and Dawson polyoxoanion [P2Mo18O62]6−. Part II: further characterizations and catalytic oxidation of the NADH coenzyme. J Solid State Electrochem 17, 137–143 (2013). https://doi.org/10.1007/s10008-012-1869-2
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DOI: https://doi.org/10.1007/s10008-012-1869-2