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Dual-recognition gold nanocluster surface ion-imprinted polyacrylic acid peptide nanocatalytic probe for SERS determination of Cd2+
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DOI：10.1016/j.jcis.2025.139659.png)
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Abstract
En 中文
In this paper, gold nanocluster (AuNC) was prepared by reduction of HAuCl4 with Csy-Pro-Pro-Cys-Trp-NH2 polypeptide (PT). Using AuNC as substrate, Cd2+ as template ions and acrylic acid as monomers, a dual recognition ion-imprinted polymer-PT nanocatalytic probe (AuNC@MIPPT) was fabricated. It was characterized by Fourier Transform Infrared Spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Zeta potential analyzer. It was found that the nanocatalytic probe not only recognized Cd2+, but also catalyzed the reduction of sodium hypophosphite (SH) to generate more gold nanoparticles (AuNPs). Using Victoria blue (VBB) as the molecular probe, the product AuNPs of sodium hypophosphite-HAuCl4 reaction generated a strongest surface enhanced Raman scattering (SERS) peak at 1615 cm−1. When Cd2+ was present, the PT and imprinted sites on the surface of the nanocatalytic probe had a specific recognition effect on Cd2+, and the SERS signal of the system linearly decreased. The decreased SERS signal values were linear to the concentration of Cd2+ in the range of 0.03–0.88 nmol/L, with a detection limit of 0.023 nmol/L, and the recovery of 99.83 % to 107.89 %.
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9.7
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3.7W
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14.7W
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