摘要
利用无模板水热法合成了镍纳米球,并通过部分氧化制备了Ni@NiO核壳结构的纳米复合物。合成的镍球和Ni@NiO复合物的尺寸可以通过简单调节反应条件来控制。运用XRD、EDS、TEM和SEM等测试方法对合成样品的形貌和组成进行了表征。Ni和Ni@NiO复合材料均有较好的磁性,其磁性用磁滞回线进行了表征。此外,Ni@NiO纳米复合物可以和血红蛋白结合构建过氧化氢生物传感器,该生物传感器对过氧化氢表现出很好的生物电催化活性,且具有较低的检测限和较宽的线性响应范围。该复合材料对于血红蛋白催化还原过氧化氢具有米氏响应和较小的米氏常数,表明Ni@NiO能较好地保持血红蛋白原有的活性。
Ni nanospheres have been successfully synthesized through a template-free hydrothermal method. Ni@NiO core-shell nanocomposites were obtained by a subsequent oxidation of Ni nanospheres. The size of the final product could be controlled via simply adjusting the experimental parameters. The morphology and structure of the Ni@NiO nanocomposites were confirmed by transmission electron microscopy （TEM）, field emission scanning electron microscopy （FESEM）, energy-dispersive X-ray spectrometry （EDS） and X-ray diffraction （XRD）. The hysteresis loops were used to study the magnetic properties of Ni and Ni@NiO. Additionally, hemoglobin （Hb） was assembled on the Ni@NiO composites to construct a novel biosensor for the determination of H2O2. The prepared biosensor showed an excellent electrocatalytic activity towards H2O2 with a wide linear range and a low detection limit. The lower Michaelis-Menten constant indicated that the Hb immobilized on the Ni@NiO nanocomposites could retain its native activity.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2012年第6期1251-1258,共8页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.21075061)
江苏省自然科学基金(No.BK2010363)资助项目
