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Voltammetric Sensing of Caffeine in Food Sample Using Cu-MOF and Graphene
Venkadesh A., Mathiyarasu J.,
Published in
Volume: 33
Issue: 4
Pages: 1007 - 1013
Cu-MOF/graphene composite were obtained by solvothermal and electrochemical methods. The interaction and formation of Cu-MOF/graphene (GE) composite was systematically studied with the support of various characterizations including X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and cyclic voltammogram (CV). The Cu-MOF/graphene composite coated glassy carbon (GC) electrode exhibited good catalytic performance towards the electro-oxidation of caffeine in neutral condition. The modified electrode displayed good linear range (5 $μ$M to 450 $μ$M), sensitivity (0.710 $μ$A $μ$M−1 cm−2), detection limit (1.38 $μ$M), selectivity, high stability and reproducibility. Finally, the fabricated electrode extended into successful detection of caffeine in tea and coffee samples with good recoveries.
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