Abstract
Metal-organic frameworks (MOFs) including cucurbit[7]uril block (Q[7]·HAuCl4) were employed to develop a diphenylamine (DPA) sensor in electrochemical method, the presence of HAuCl4 improved the conductivity of the macrocyclic compound. To further enhance of the sensitivity, Au nanoparticles were inserted between the surface of glassy carbon electrode and Q[7]·HAuCl4 MOFs (GCE-AuNPs-Q[7]·HAuCl4). Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV) were applied for evaluation on the electrochemical behavior. For the electrochemical inertness of DPA, a label-free electrochemical sensor in 5mM K3[Fe(CN)6] solution was achieved, to produce a limit of detection as low as 4.6µM in a linear range of 5-1000µM with good reproducibility, high stability and acceptable anti-interference ability. Application of the proposed electrode for the quantitative determination of DPA in tap water and apple juice confirms its real value.
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