碳/氧化锌纳米线阵列/泡沫石墨烯电化学检测叶酸

通过化学气相沉积法制备三维(3D)泡沫石墨烯(GF),然后利用水热合成法在泡沫石墨烯表面生长氧化锌纳米线阵列(ZnO NWAs),再利用化学气相沉积法在其表面沉积碳(C),得到碳/氧化锌纳米线阵列/泡沫石墨烯(C/ZnO NWAs/GF)复合材料.用该复合材料做电极,采用电化学方法检测叶酸(FA).结果表明,三维泡沫石墨烯具有和模板泡沫镍一样的三维孔状结构,ZnO NWAs均匀且垂直地生长在泡沫石墨烯表面,碳沉积在ZnO NWAs表面.在线性范围为0~60 μmol·L-1内,C/ZnO NWAs/GF电极检测FA时,灵敏度为0.13 μA·μmol-1·L,且在尿酸(UA)干扰下检测 FA具有良好的选择性.C/ZnO NWAs/GF电极有良好的稳定性和重复性.

Electrochemical determination of folic acid using carbon/ZnO nanowire arrays/gra-phene foam

Three-dimensional (3D) graphene foam (GF) was synthesized by chemical vapor deposition(CVD). Following this, ZnO nanowire arrays (ZnO NWAs) were grown on the 3D GF by hydrothermal synthesis. Finally, carbon (C) was deposited on the surface of ZnO NWAs by CVD to obtain a C/ZnO NWAs/GF hybrid. This composite was used to detect the presence of folic acid. The experimental results show that the GF inherits the 3D macroporous structure of nickel foam and that the ZnO NWAs are uniformly and vertically grown on the 3D GF. The length and diameter of the ZnO nanowires are ~50 nm and 2 μm,respectively. Carbon is deposi-ted on the surface of ZnO NWAs,and the C/ZnO NWAs/GF is used as a working electrode to detect folic acid(FA) using an electro-chemical method. The experimental results show that the sensitivity of the electrode for FA is 0.13 μA·μmol-1·L and it has good se-lectivity for detecting FA in the presence of uric acid. The electrode also has excellent reproducibility and stability.