A graphene-modified Co-BDC metal-organic frameworks (Co-MOF) for electrochemical non-enzymatic glucose sensing

Abstract

In this work, a metal-organic framework (MOF) based on cobalt was decorated with graphene and used as a sensing material for glucose determination with electrochemical principles. The selection of Co-MOF material is based on its porous nature, large surface area, and excellent electrochemical properties. The combination of Co-MOF with graphene (high conductivity) effectively increased the electrochemical sensor current. The fabricated composite owned the good crystallinity with graphene particles attached to the Co-MOF surface. The biosensing performance was evaluated by cyclic voltammetry (CV) with 0.1 M NaOH solution as the bolstering electrolyte. The electrochemical measurement indicated that the prepared materials possessed a well-moved transfer electron between the electrode surface and electrolyte solution. The Co-BDC-3Gr sample obtained the best electrochemical performance with the lowest limit of detection (LOD) of 5.39 μM and the highest sensitivity of 100.49 μA mM-1 cm-2. The selectivity test of the modified Co-MOF was done by comparing the response with other compounds such as dopamine, uric acid, and NaCl. The acquired biosensor had excellent stability, with 93% of the initial response after 30 days of storage.

Novel Tannic Acid-Modified Cobalt-Based Metal–Organic Framework: Synthesis, Characterization, and Antimicrobial Activity

“…The characteristic bands observed between 800 and 1150 cm –1 were due to aromatic C–H bonds of TPA . The bands at around 1098 and 800–700 cm –1 were related to C–O–Co and Co–O stretching vibrations, respectively, indicating good coordination of carboxylic acid group of TPA and cobalt ions. − The spectrum of Co-TPA/TA (Figure b) appears to be quite similar to the spectrum of Co-TPA (Figure c) demonstrating the same bond features with slight shifts (1–5 cm –1 ) in the frequencies of peaks except for the OH group. The noticeable decrease in the intensities of the bands in Co-TPA/TA could suggest the successful coordination of phenolic −OH groups in benzene rings of TA with cobalt ion.…”

Evaluating the electrocatalytic activity of flower-like Co-MOF/CNT nanocomposites for methanol oxidation in basic electrolytes

“…The characteristic bands located at 752, 1025, and 1105 cm −1 were attributed to the para-aromatic stretching bands of the benzene ring. 37,38 The new bands located at 512, 552, and 1377 cm −1 for all the Co-MOF samples were due to the M-O(Co-O) 39 as shown in Fig. 2.…”

Metal–Organic-Framework- and MXene-Based Taste Sensors and Glucose Detection

“…They attributed this result to the accelerated charge-carrier transport of ZIF-67 by silver nanograins. In addition, Yuniasari et al utilized graphene to improve electron transport in a type of Co-MOF [66]. As expected, this strategy produced exciting results, including a small detection limit of 5.39 µM and outstanding durability.…”