Synthesis of graphene/ZnO nanowire arrays/graphene foam and its application for determination of folic acid

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 808; pp. 189 - 194
• Main Authors: Gao, Xin, Yue, Hongyan, Huang, Shuo, Lin, Xuanyu, Gao, Xuan P.A., Wang, Bao, Yao, Longhui, Wang, Weiyi, Guo, Erjun
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.01.2018; Elsevier Science Ltd
• Subjects: Biosensor; Biosensors; Chemical synthesis; Chemical vapor deposition; Electrical resistivity; Folic acid; Graphene; Graphene foam; Metal foams; Nanowires; Organic chemistry; Reproducibility; Uric acid; Vitamin B; Voltammetry; Zinc oxide; Zinc oxides; ZnO nanowire arrays; Uric acid; ZnO nanowire arrays; Biosensor; Graphene foam; Folic acid
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2017.12.017

Graphene foam (GF) was synthesized by chemical vapor deposition (CVD) using nickel foam as the template. Then, ZnO nanowire arrays (ZnO NWAs) were grown on the GF by hydrothermal synthesis. Finally, graphene (Gr) was deposited on the ZnO NWAs by CVD to obtain the hybrid of Gr/ZnO NWAs/GF. Due to large specific surface area and outstanding electric conductivity, the hybrid can be used for the determination of folic acid (FA) by cyclic voltammetry and differential pulse voltammetry. The results show that ZnO NWAs are uniformly and vertically grown on the GF and Gr is deposited on the ZnO NWAs. The sensitivity and the measured detection limit of the hybrid for FA in the range of 0–60μM are 0.18μAμM−1 and 1μM, respectively. The hybrid can accurately detect FA in the presence of uric acid, and the hybrid also shows good reproducibility and stability. •Novel hybrid of Gr/ZnO NWAs/GF was prepared.•The hybrid can be used for the detection of folic acid (FA).•The hybrid demonstrates a high sensitivity (0.19 μA•μM-1) for the detection of FA.•The hybrid shows an excellent selectivity to determine FA in the presence of UA.