A good-performance glucose sensor fabricated via rationally designing a new cobalt-metal-organic framework precursor

A good-performance glucose sensor based on Co(3)O(4)has been first synthesized by rationally designing a new cobalt-metal-organic framework precursor, having the structural formula of [Co(Cia)(2)(bmb)](n)(Cia = 5-((4-carboxybenzyl)oxy)isophthalic acid, bmb = 1,4-bis(2-methylbenziidazol-1-ylmethyl)benzene). The Co-MOF precursor exhibits one-dimensional chains in molecular structures, which are further extended to form a 3D frameworkviahydrogen bonds. The Co-MOF crystals show a separated columnar shape and are further stacked into micro-flower clusters. Then, the micro-flower clusters of Co-MOF precursors are transformed into Co(3)O(4)with a curved sheet morphology by treatment at 450 degrees C in air. The Co3O4-modified glassy carbon electrode (Co3O4/GCE) is applied as a glucose sensor, which works well both at a low glucose concentration range of 0.001-2 mM and high concentration range of 2-8 mM with sensitive sensitivities of 254.21 mu A mM(-1)cm(-2)and 102.80 mu A mM(-1)cm(-2), respectively. Moreover, Co3O4/GCE exhibits good anti-interference, reproducibility and stability. This study aims to not only provide an example to fabricate Co(3)O(4)with diverse morphologies but also affords a strategy to explore more effective electrode materials as high-performance electrochemical sensors.