Plasmon-Enhanced Fluorescent Nanoprobe for Ultrasensitive and Selective Detection of Nitroaniline Derivatives

Abstract

A water-soluble, plasmon-enhanced fluorescent nanoprobe is engineered through Zn²⁺-directed assembly of HQS-capped silver nanoparticles and zinc–quinolate complexes. Plasmonic coupling amplifies emission, enabling selective ppb detection of 4-nitroaniline and 2,4-dinitroaniline via NH₂→Zn²⁺ coordination-induced static quenching, delivering excellent sensitivity in real water matrices with high selectivity, sensitivity, and environmental applicability.