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50 nm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31.37 mA/(mmol·L-1·cm2)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)2/C 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 microspheres. 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 nm 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 31.37mA/(mmol·L-1·cm2)better than that of NiO, among the linear range of 2–1279μmol/L with detecting limit at 2μmol/L. Furthermore, the core-shelled NiO/C microspheres exhibit good stability and anti-interference ability.
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