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Application of bimetallic gold–platinum nanoparticles in optical fiber sensors for pesticide detection
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DOI：10.1039/D6RA01129B.png)
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Abstract
En 中文
As chemical pesticides are widely applied to farming; rapid and ultrasensitive detection assays should be further designed for food safety and ecological health. Herein; we present a novel localized surface plasmon resonance (LSPR) optical fiber sensor using bimetallic Au@Pt core–shell nanoparticles for simultaneous detection of Quinalphos and Thiram. Four individual Au@Pt nanostructures (Au@Pt 1–4) were synthesized and a systematic change of the platinum precursor concentration was used to induce controlled evolution of the nanostructure from smooth shells to very dendritic assemblies. Detailed characterization via UV-Vis; FE-SEM; EDS; and HR-TEM revealed that the Au@Pt 3 sample; with a dendritic shell 12.5 nm thick; exhibited the optimal balance of specific surface area and plasmonic “hot spots”. When integrated into a PDMS microfluidic channel; the Au@Pt 3-functionalized fiber sensor demonstrated high sensing performance. It could reach the ultralow detection limits (LOD) of 2.01 × 10−14 M for Quinalphos and LOD of 1.37 × 10−11 M for Thiram with a wide linear dynamic range. In addition; the sensor showed good reproducibility (RSD = 1.67%) and short-term stability (CV < 0.1%). These results also demonstrate the crucial influence of bimetallic morphology on LSPR activity and offer a promising platform for ultrasensitive pesticide detection.
Keywords:
bimetallic nanoparticles
localized surface plasmon resonance
optical fiber sensor
pesticide detection
Au@Pt core–shell
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