An Electrochemical Sensor Based on Molecularly‐Imprinted‐Polymer‐Modified Carbon Quantum Dots@hexagonal Boron Nitride Nanosheets Nanocomposites for Triclosan Determination

An electrochemical sensor based on carbon quantum dots@hexagonal boron nitride nanosheets nanocomposites (CQDs@HBNNS-NCs) and molecularly imprinted polymer (MIP) was proposed for the triclosan (TCS) analysis. The CQDs@HBNNS-NCs were utilized as the modifier, which exhibited excellent electrochemical properties. The MIP film was prepared in situ in the presence of template (TCS) and monomer (o-phenylenediamine) to provide the specific molecular recognition. The CQDs@HBNNS-NCs were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under the optimal conditions, the current response was linear with the logarithmic value of TCS concentration in the range of 2 nM-0.1 mM, and the limit of detection (LOD) was calculated as 0.005 mu M (S/N=3). Furthermore, the proposed electrochemical sensor showed favorable selectivity, stability, and was used for the TCS analysis in tap water samples with decent accuracy.