Highly-dispersed iron element decorated nickel foam synthesized by an acid-free and one-pot method for enzyme-free glucose sensor

无酸一步法合成高度分散铁元素修饰的泡沫镍无酶葡萄糖传感器

The highly-dispersed iron element decorated Ni foam was prepared by simple immersion in a ferric nitrate solution at room temperature without using acid etching, and characterized by X-ray powder diffraction(XRD), scanning electron microscopy(SEM), EDAX spectrum(EDAX mapping) and Raman spectroscopy. The EDAX spectrum illustrated that iron element was highly-dispersed over the entire surface of nickel foam, and the Raman spectroscopy revealed that both Ni-O and Fe-O bonds were formed on the surface of the as-prepared electrode. Moreover, the iron element decorated Ni foam electrode can be used as non-enzymatic glucose sensor and it exhibits not only an ultra-wide linear concentration range of 1-18 mmol/L with an outstanding sensitivity of 1.0388 m A·mmol/(L·cm2), but also an excellent ability of stability and selectivity. Therefore, this work presents a simple yet effective approach to successfully modify Ni foam as non-enzymatic glucose sensor.

本文提出了一种简单而有效的方法将泡沫镍电极改性并用于无酶葡萄糖传感器。在室温、无酸的条件下,将泡沫镍浸入硝酸铁溶液中制备高分散的铁元素修饰的电极,并通过X射线粉末衍射(XRD),扫描电子显微镜(SEM),EDAX光谱(EDAX)和拉曼光谱进行表征。EDAX光谱表明,铁元素高度分散在泡沫镍的整个表面上;拉曼光谱表明,Ni-O和Fe-O键均在制备好的电极表面上形成。此外,铁元素修饰的泡沫镍电极不仅具有1~18 mmol/L的超宽线性浓度范围和1.0388 mA·mmol/(L·cm^(2))的灵敏度,还具有很强的稳定性和选择性,可以用作非酶葡萄糖传感器。