Enhanced non-enzymatic glucose sensing of Cu–BTC-derived porous copper@carbon agglomerate
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Porous copper@carbon agglomerate (PCCA) is prepared by pyrolysis of Cu3(BTC)2·3H2O (Cu–BTC, BTC = 1,3,5-benzenetricarboxylic acid) in 5% H2–N2 mixture atmosphere. The phase and morphology evolution are thoroughly examined by XRD, Raman, BET, TG, XPS, SEM and TEM, respectively. The results show that PCCA is formed at 400 °C and maintains the cubic morphology of the original Cu–BTC crystal. PCCA is composed by round-shaped copper nanoparticles that covered outside by thin layer of carbon. The non-enzymatic glucose sensing properties of PCCA-modified glassy carbon electrode (Cu/GCE) are characterized by cyclic voltammetry. The sensor shows high sensitivity of 614.3 µA mM−1 to glucose oxidation and negligible responses toward interference from uric acid, ascorbic acid, dopamine and l-cysteine at the level of their physiological concentrations. The sensor also exhibits rapid response (< 6 s), wide linear range (up to 3.33 mM) and low detection limit (0.29 µM at signal/noise ratio (S/N) = 3). Finally, the good stability, reproducibility and repeatability to glucose detection make PCCA a promising catalyst for non-enzymatic glucose sensor.
The project was supported by National Natural Science Foundation of China (51302069, 51372073), Foundation of Heilongjiang Educational Department (2013TD002) and Nature Science foundation of Heilongjiang Province in China (E2016051).
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