科研之友
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摘要
In this account, [BMIM](6)P2Mo18O62 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 center dot nH(2)O, where 92 % of the structure is crystalline, 84 % of the structure of [BMIM](6)P2Mo18O62 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 center dot nH(2)O by [BMIM](+) cations. TEM showed that K6P2Mo18O62 center dot nH(2)O has uniform and spherical nanoparticles with an average diameter of similar to 100 nm. However, the hybrid material displayed less uniform morphology with spherical and variously shaped nanoparticles with diameters varying from similar to 10 to 100 nm. Raman spectroscopy of [BMIM](6)P2Mo18O62 illustrated that peaks of the Dawson [P2Mo18O62](6-) unit in [BMIM](6)P2Mo18O62 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](6)P2Mo18O62 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](6)P2Mo18O62 is found to efficiently catalyze the oxidation of the NADH coenzyme at low overpotentials. Amperometry revealed high sensitivities (similar to 1.97 mu A mM(-1) mm(-2)) and extended linearity (similar to 9.1 mM) of [BMIM](6)P2Mo18O62/GC electrode towards the oxidation of the NADH coenzyme.
- 出版日期2013-1
