A new gold nanosol SERS method for ultratrace atrazine by a difunctional surface molecular imprinted polymethacrylate probe

Abstract

A new type of bifunctional nanosurface molecularly imprinted polymer nanoprobe (Au@MIP) was prepared using methacrylic acid as functional monomers respectively, gold nanoparticles (AuNP) as nanosubstrate. The Au@MIP nanoprobe not only has recognition function but also has catalytic function. The findings demonstrate that the AuNP@MIP nanoprobes, prepared with methacrylic acid as the functional monomer, very strongly catalyzed the new nano indicator reaction of glyoxal (GO)-HAuCl4. In situ generated AuNP sol exhibits strong surface-enhanced Raman scattering (SESR) effects. After adding atrazine (ATZ), the signals were significantly boosted. As a result, a new SESR trimode sensor platform was created for ultratrace ATZ. The linear ranges for ATZ was 0.005–0.0625 nmol/L, with detection limits of 0.0012 nmol/L. Moreover, the SERS method was used to determine the content of ATZ in corn samples, achieving relative standard deviations (RSDs) of 6.53–9.57 % and recoveries of 96.4 %–108.2 %.