Abstract
Herein, a functional hybrid named metalloporphyrin hemin modified carbon nanotube decorated titanium carbide (Hemin/CNT/Ti3C2Tx) with redox catalytic ability is studied and applied to electrochemical sensing. The morphology, crystal structure and chemical composition of the hybrid are investigated through field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and Brunauer-Emmett-Teller (BET) analysis. Benefiting from the unique multilayer structure, strong enrichment ability, excellent electrochemical performance of CNT/Ti3C2Tx and outstanding catalytic property of hemin, the developed Hemin/CNT/Ti3C2Tx hybrid presents desirable performance for electrochemical sensing. Two independent electrochemical sensing techniques including chronoamperometry (i-t) and differential pulse voltammetry (DPV) are adopted to realize hydrogen peroxide (H2O2) and uric acid (UA) determination, demonstrating the excellent redox catalytic ability of Hemin/CNT/Ti3C2Tx. More importantly, it is successfully applied to real-time monitoring of H2O2 released from living cells, and accurate determination of UA in urine samples is also realized, demonstrating a good practicability.
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