基于氧化石墨烯/ZnO纳米阵列的无酶葡萄糖传感器

Non-enzymatic Glucose Sensor Based on Graphene Oxide/ZnO Nanoarrays

采用微波水热合成法在不锈钢表面制备氧化石墨烯/ZnO纳米棒阵列(GO/ZnO NRs)作为无酶葡萄糖传感器电极。通过扫描电子显微镜、X射线衍射仪、透射电子显微镜等对电极进行形貌、组织和结构的表征,并通过电化学工作站在有光和无光条件下对电极进行了电流-时间(I-t)曲线测试,分析了在不同氧化石墨烯(GO)沉积条件下GO/ZnO NRs的光电化学性能,在无酶条件下对电极进行光电化学葡萄糖传感测试。结果表明,GO的添加使得ZnO无序的纳米颗粒/棒形貌转变为定向生长的一维阵列,并随着GO的全程添加,ZnO(200)晶面的垂直堆积被抑制,(100)晶面和(101)晶面逐渐堆积,从而使ZnO纳米棒的形貌从原有的尖头生长成平头形。所得GO/ZnO NRs对葡萄糖具有较高的检测灵敏度、较低的检测限和良好的检测范围。

Graphene oxide/ZnO nanorod arrays(GO/ZnO NRs)were prepared on the surface of stainless steel by microwave hydrothermal synthesis as an enzyme-free glucose sensor electrode.The morphology,organization and structure of the electrode were characterized by scanning electron microscope,X-ray diffractometer,transmission electron microscope,etc.,and the electrode was subjected to current-time(I-t)through electrochemical workstation under light and non-light conditions.I-t curve tests were used to analyzed the photoelectrochemical performance of GO/ZnO NRs under different graphene oxide(GO)deposition conditions,and photoelectrochemical glucose sensing tests were performed on the electrode under enzyme-free conditions.The results show that the addition of GO transform the disordered nanoparticle/rod morphology of ZnO into an one-dimensional array of directional growth.With the increase of GO content,the vertical accumulation of ZnO(200)crystal planes is suppressed,while the crystal planes(100)and(101)are gradually accumulated.Thus,the morphology of ZnO NRs grow from the original sharp tip to a flat tip.The obtained GO/ZnO NRs have high detection sensitivity for glucose,low detection limit and good detection range.