AgAu bimetallic nanoparticle-decorated ZnO nanoplates for sensitive SERS detection of cypermethrin: plasmonic hotspots and interfacial charge-transfer effects.

ABSTRACT: A ZnO/AgAu hybrid SERS substrate was developed for the sensitive detection of cypermethrin by integrating the charge-transfer capability of ZnO with the strong plasmonic response of AgAu bimetallic nanoparticles. ZnO nanoplates were synthesized hydrothermally and subsequently decorated with AgAu nanoparticles through the in situ co-reduction of AgNO₃ and HAuCl₄. Structural, morphological, optical, and surface-chemical analyses confirmed the formation of well-dispersed AgAu bimetallic nanostructures strongly coupled with the ZnO support. By optimizing the Ag/Au molar ratio, the substrate achieved a broad linear response toward cypermethrin over 0.2-10 ppm, a minimum detectable concentration of 0.2 ppm, and an enhancement factor of 8.13 × 10⁷. Density

SUBMITTER: Nga PT 

PROVIDER: S-EPMC13632636 | biostudies-literature | 2026 Oct

REPOSITORIES: biostudies-literature