In this paper, we constructed MIL-53 (AlOHbdc, bdc = benzene-1,4-dicarboxylate) /CNTs and Prussian blue (PB) as the double sensitization material of the sensing platform, in which the MIL-53/CNTs hybrid can not only increase the specific surface area but also increase the conductivity of the sensor and PB can play a role in amplifying electrical signals and accelerating electron transmission. Pyrrole was used as monomer and E2 was used as template for electropolymerization to form conductive film. Moreover, the overoxidation/dedoping elution method were used to simplify the experimental process. Under optimal conditions, the MIECS exhibited an excellent sensitivity and high selectivity with a wide linear response range between 10 −14 to 10 −9 mol L −1 and an estimated detection limit of 6.19 × 10 −15 mol L −1 .
Luyi Zhu,Qinan Zhou,Wenqing Shao,Zhenbo Wei,Jun Wang
A novel Co-based organic frameworks/carbon nanotubes/silicon dioxide (Co-MOF/CNTs/SiO2)-modified Au electrode was fabricated and taken as a platform for gallic acid (GA) detection. The composite combined the advantages of Co-MOF, CNTs and SiO2, and higher electrochemical response of Co-MOF/CNTs/SiO2-modified electrode indicated that the composite material exhibited satisfied the catalytic activity towards GA. Moreover, the electrochemical oxidation process of GA was deeply investigated on the surface of electrode based on computational investigations. Hirshfeld charges and condensed Fukui functions of each atom in GA were calculated. Besides, the catalysis of Co-MOF to GA was further investigated based on density functional theory. The quantitative determination of GA was carried out and showed a linear range between 0.05–200 μM, with low limit of detection. The sensitivity value of the self-assembled electrochemical sensor was calculated to be 593.33 μA cm−2mM−1, and the selectivity, reproducibility and stability of the gallic acid sensor were also confirmed in the study.Keywords:gallic acid;electrochemical;electro-oxidation;detection;density functional theory
A flexible electrochemical sensing platform on the basis of carbon cloth modified with zeolite imidazole framework-67/carbon nanotubes nanocomposite with catalase-like activity was developed for in situ and real-time tracking of H 2 O 2 produced by living cells. The obtained sensor exhibits excellent electrochemical performance for detecting H 2 O 2 with a broad linear response range from 1 µM to 5.2 mM and a detection limit of 0.3 µM. Owing to the favorable biocompatibility and mechanical stability of the prepared electrodes, living cells can be proliferated well on their surfaces, thereby achieving in situ and real-time profiling of endogenous H 2 O 2 flux from normal and cancer cells. This work proposed a novel sensing platform for extracellular analysis, providing an innovative tool for the dynamic monitoring of biomarkers generated by cellular metabolism in cell biology. Graphical abstract The alternative text for this image may have been generated using AI.
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