An efficient platform for dopamine detection based on the cobalt and zinc bi-metal organic frameworks derived from the double metal hydroxides

• Published in: Materials letters 2021-06, Vol.293, p.129739, Article 129739
• Main Authors: Zhang, Xia, Li, Danqing, Sun, Yangang, Dong, Chaoyang, Zhu, Haojie, Li, Xiang, Cao, Qiumin, Shen, Jinwen, Yan, Fuli, Wei, Yajun, Lu, Yongjuan, Yu, Jing, Zhu, Junwei, Wan, Zhen, Xu, Yuandong
• Format: Article
• Language: English
• Subjects: Chemical sensors; Dopamine; Electrochemical analysis; Hydroxides; Materials science; Metal hydroxides; Metal organic frameworks; Morphology; Nanocomposites; Redox reactions; Selectivity; Sensors; Zinc
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2021.129739

•CoZn-MOF/RHC is prepared from the derivation of CoZn-DMH.•The electrocatalytic reaction of dopamine at CoZn-MOF/RHC is an diffusion controlled process.•CoZn-MOF/RHC sensor displays wide linear range and low detection limit. Cobalt and zinc bi-metal organic frameworks (CoZn-MOF) derived from double metal hydroxides (CoZn-DMH) is synthesized on the surface of rice husk carbon via hydrothermal method. The obtained CoZn-MOF/RHC is then used as electrochemical sensor for dopamine detection. SEM and TEM characterization displays that the morphology of CoZn-MOF/RHC is different from CoZn-DMH, as well as the electrochemical performance. Further investigation reveals that the kinetic process of the redox reaction of dopamine on CoZn-MOF/RHC electrode is controlled by diffusion process. Under the optimum conditions, the redox peak current linearly relates with the concentration of dopamine in the range of 2 μM~0.8 mM, with the low detection limit of 0.67 μM. During the anti-interference experiment, CoZn-MOF/RHC exhibits good selectivity toward dopamine detection but inappreciable response for interferent.