一种基于铟锡掺杂氧化镍材料的高灵敏度无酶电化学葡萄糖传感器

A high sensitivity non-enzymatic electrochemical glucose sensor based on In-Sn@NiO composite

以泡沫镍为基底通过一步法原位生长氧化镍,同时加入铟离子与锡离子,制备了高灵敏度无酶葡萄糖传感器敏感电极复合材料In-Sn@NiO。X射线光电子能谱(X-ray Photoelectron Spectroscopy,XPS)测试结果证明,氧化镍表面存在铟元素与锡元素。扫描电子显微镜(Scanning Electron Microscope,SEM)结果表明,掺杂铟离子与锡离子后,氧化镍表面形貌由较为致密的片状堆叠结构变成了垂直生长的纳米柱结构,结构更有利于表面粒子传输。电化学测试结果显示,掺杂后电极对葡萄糖的响应得到了显著的改善,最高灵敏度达到了91.9 mA/(μmol·L^(-1)·cm^2),检测限为0.02μmol/L。

To further improve the performance of non-enzymatic electrochemical glucose sensor, a one-step in-situ oxidation method was used to prepare nickel oxide material directly grown on nickel foam. Moreover, the indium and tin ions were doped into the nickel oxide material during the growth process, and an In-Sn@ NiO composite could be obtained. XPS measurement indicated that the indium and tin ions were successfully doped into nickel oxide material. Through the SEM images, the surface of the doped nickel oxide electrode showed a structure of nanorods instead of nanosheets. Compared with undoped material, the structures could benefit the transport of surface particles. From the results of electrochemical sensitivity test towards glucose, this electrode exhibited a remarkable performance with a sensitivity of 91.9 mA/（μmol· L-1 , cm2） and the limit of detection was 0.02 μmol/L.