Molecularly Imprinted Electrochemical Sensor Based
on the Self-Assembly of Cage-like Gold Nanoparticles and Amino-Functionalized
rGO for the Detection of Diuron in Cotton Defoliant
posted on 2024-01-09, 04:29authored byYi He, Xiaoya Bi, Xiaohong Liu, Jin Zhu, Libo Li, Tianyan You, Xuegeng Chen
Diuron (DU) is a kind of cotton defoliant
with high toxicity and
strong persistence that poses a serious environmental threat. DU has
electroactive inertness and oxidation resistance, and there are only
a few types of recognition elements, making its sensitive and specific
detection critical. Herein, a novel molecularly imprinted polymer-based
electrochemical (MIP-EC) sensor was developed by combing gold nanocages
(AuNCs) with hollow-interior and porous walls with amino-functionalized
reduced graphene oxide nanosheets (NH2-rGO) with a large
surface area and excellent conductivity. Then, DU-MIP was directly
grown on the modified electrode by electropolymerization, while it
displayed a high imprinted factor (6.91) and high reusability (at
least 5 times). Significantly, the NH2-rGO/AuNC nanocomposite
could also enhance the recognition efficiency of DU-MIP, improving
the analytical performances of the MIP-EC sensor, with the detection
limit down to 4.3 ng/mL. In addition, this sensor exhibited high selectivity
and rapid elution/recombination, and a simple construction process
was utilized to detect DU in cotton and soil.