Au-Pt合金枝状纳米线无酶过氧化氢传感器

A Non-enzymatic Hydrogen Peroxide Biosensor based on Au-Pt Alloy Dendritic Nanowires-modified Electrode

通过交流电沉积的方法,在Au微电极表面制备Au-Pt合金枝状纳米线,采用扫描电子显微镜和X射线能谱表征了合金纳米线的形貌和成分.用枝状纳米线构筑成H2O2传感器,研究结果表明,该传感器具有很好的电化学催化性能,对H2O2响应线性范围为20×10-6～8.38×10-3mol.dm-3,检出限可达1.5×10-6mol.dm-3,灵敏度达到129.2μA.dm3.mmol-1.cm-2.对比文献报道同类传感器的性能,该传感器对H2O2传感性能卓越,有良好的应用前景.

The Au-Pt alloy dendritic nanowires have been controllably electrodeposited on the Au microelectrodes by applying an alternating current. The composition, morphology and alloy structures of the nanowires were characterized by a scanning electron microscopy （SEM）, energy- dispersion X-ray （EDX） spectrometer and X-ray diffraction （XRD）. When it was applied in the electrochemical detection of hydrogen peroxide, the sensor composed of Au-Pt alloy nanowires modified microelectrode exhibited excellent performances with a wide linear range （20 × 10-6 -8.38 × 10^-3 mol. dm^-3）, a low detection limit （1.5×10^-6 mol · dm^-3）, a high sensitivity（129.2μA- dma · mmol^-1 · cm^-2） and good reproducibility and stability. As compared with the similar sensors in literature, the developed sensor had the advantages of attractive analytical performances and facile preparation. It will become a promising sensor for the effective detection of H2 O2.