氧化锌纳米线阵列/泡沫石墨烯电化学检测左旋多巴

采用化学气相沉积法以泡沫镍为模板制备三维多孔网状泡沫石墨烯（GF）,利用水热法在其表面垂直生长氧化锌纳米线阵列（ZnO NWAs）,得到三维形貌的ZnO NWAs/GF复合材料.采用扫描电镜、透射电镜、X射线衍射、拉曼光谱等测试方法对该复合材料进行了表征.结果表明:制备的石墨烯层数较少且纯净无缺陷.ZnO NWAs垂直于三维GF表面且尺寸分布均匀.利用电化学方法用ZnO NWAs/GF检测左旋多巴（LD）.电化学测试结果表明,ZnO NWAs/GF在线性范围为0~80μmol·L-1内检测LD时,检测灵敏度为0.41μA·（μmol·L-1）-1,且具有良好的重复性和稳定性.在尿酸（UA）干扰下,ZnO NWAs/GF对检测LD有很好的选择性. 

Electrochemical determination of levodopa using ZnO nanowire arrays/graphene foam

A three-dimensional (3D), macroporous and highly conductive grapheme foam (GF) was synthesized by chemical vapor deposition using a nickel foam as a template. ZnO nanowire arrays were vertically grown on the surface of the prepared GF using hydrothermal synthesis. The morphologies and structure of the ZnO NWAs/GF were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Raman spectroscopy. The results show that the prepared GF is high-quality and defect free, and the ZnO NWAs with uniform size vertically grows on the surface of 3D GF. The ZnO NWAs/GF was used as an elec-trochemical electrode for determining levodopa (LD). The results of electrochemical tests show that the oxidation current of LD is well linear with its concentration in the range of 0-80μmol·L-1 with a sensitivity of 0.41μA·(μmol·L-1)-1, and the ZnO NWAs/GF electrode also shows good reproducibility and stability. The ZnO NWAs/GF can detect LD with high selectivity in the presence of uric acid.