Rapid detection of orange II dyes in water with SERS imprinted sensor based on PDA-modified MOFs@Ag

In this paper, a novel SERS imprinted composite material was successfully synthesized with the aid of surface enhanced Raman scattering technology and molecular imprinting technology, which could be suitable for specific detection of organic dyes in the river. The UIO-66(NH2) was wrapped with a thin layer of polydopamine (PDA), after loading Ag nanoparticles on rough surface, Ag@UIO-66(NH2)/PDA was synthesized and applied as the SERS substrate. In order to promote the ability of selective detection property in the practical sample, the molecularly imprinted polymer (Ag@UIO-66(NH2)/PDA-MIPs) was proposed. When the concentrations range changed between 10−8 mol/L and 10−10 mol/L, the intensity of characteristic peak at 1596 cm−1 exhibited a linear relationship with OII concentrations increasing. The limit of detection was low than 10−10 mol/L, the correlation coefficient was 0.9985. The prepared SERS substrate could be available to the practical sample detection, which expanded SERS detection fields. [Display omitted] •Ag NPs were attracted to the surface of UIO-66(NH2), confirming excellent sensitivity.•The active substrate is coated by molecular imprinted polymers to promote selectivity.•Different mass ratio of PDA and AgNO3 is investigated to optimize the SERS sensitivity of imprinted composite material.