核壳结构氧化镍/碳微球的制备及葡萄糖传感性能

Preparation and Glucose Sensing Property of Core-shelled Nikel Oxide/Carbon Microspheres

以碳球为模板，六水合氯化镍和尿素为原料，通过水热反应制备前驱体Ni（OH）2／C，在高纯氮气中煅烧获得核壳结构的NiO／C微球。采用扫描电镜（SEM）、X射线衍射（XRD）、X射线光谱（EDX）和热重分析（TGA）等技术手段，分析NiO／C微球的形貌结构以及物相组成，结果表明：NiO／C微球直径约1．4μm，由厚度为50nm的纳米片包覆碳球形成花状核壳结构，NiO呈立方相。通过循环伏安法和计时电流法研究了NiO／C微球的电化学行为及葡萄糖传感能力。与单纯NiO相比，NiO／C具有优异的葡萄糖传感性能，其灵敏度为31．37mA／（mmol·L^-1．cm^2）线性响应范围为2-1279μmol／L，最低检测限为2μmol／L。该传感器具有灵敏度高、抗干扰能力强和稳定性好等特点。

By using carbon spheres as a template, precursor Ni（OH）jC were prepared by a hydrothermal synthesis technology with the reaction of hexahydrate nickel chloride and urea. And then the precursor was calcinated in pure nitrogen to obtain core-shelled NiO/C mierospheres. Scanning electron microscope （SEM）, X-ray diffraction （XRD）, X-ray energy dispersive （EDX）, and the thermo gravimetric analyzer （TGA） were used to characterize morphology and structure of the samples. Results show that the NiO/C microspheres have core-shell structure with diameter around 1.4μm, carbon sphere as the core, and cubic NiO nanoplates with thickness of 50 μm as the shell. Electrochemical behavior and sensing property of core-shelled NiO/C microspheres were studied via cyclic voltammetry and amperometric method. The results displayed that glucose sensitivity of the NiO/C is 31.37 mA/（mmol·L^-1·cm^2） better than that of NiO, among the linear range of 2-1279 μmol/L with detecting limit at 2μmol/L. Furthermore, the core-shelled NiO/C microspheres exhibit good stability and anti-interference ability.