A molecule-imprinted electrochemiluminescence sensor based on Au-g-C3N4 NS nanocomposite for detection of folic acid
As a new type of two-dimensional semiconductor nanomaterials,graphite-phase carbon nitride nanosheets(g-C3N4 NS)have attracted much attention in the field of electrochemiluminescence(ECL)sensing due to their excellent ECL performance and excellent film forming properties.However,the ECL signal generated by g-C3N4 NS is unstable at higher operating voltages.The introduction of gold nanoparticles(Au NPs)can significantly improve the luminescence stability.Accordingly,Au NPs were introduced into g-C3N4 NS through in situ growth to obtain Au-g-C3N4 NS which was fixed on the electrode as the ECL substance.Meanwhile,a molecularly imprinted polymer(MIP)with specific recognition ability was introduced to construct a MIP-ECL sensor for detecting folic acid(FA).The sensor showed a high selectivity and sensitivity to FA.The ECL signal showed a good linear relationship with FA concentration in the range of 1.0×10-10-1.0×10-3 mol·L-1,and the limit of detection(LOD)was 0.07 nmol·L-1.The sensor was used to detect folic acid in the samples,and satisfactory results were obtained.
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