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Updated: Jun 26, 2026
A Method for Selecting Structure-switching Aptamers Applied to a Colorimetric Gold Nanoparticle Assay
Published on: February 28, 2015
NIR-Responsive AuAgPt Plasmonic Nanozyme: Colorimetric/Photothermal Dual-Signal Sensing Array for Discriminating and
Qian Wu1, Fang Sun1, Haixia Kong2
1Chongqing Key Laboratory of Green Catalysis Materials and Technology, College of Chemistry and Materials Science, Chongqing Normal University, Chongqing 401331, P. R. China.
Abstract:
Accurate discrimination and quantification of sulfur-containing compounds (SCCs) are essential for food safety. Herein, a near-infrared (NIR)-responsive AuAgPt ternary metallic plasmonic nanozyme is engineered, exploiting its broad NIR-I/II absorption to synergistically enhance peroxidase-like activity via plasmon-induced hot carriers, intermetallic electron transfer, and photothermal effects. This dual-signal amplification strategy enables the construction of a colorimetric/photothermal sensing array to discriminate five key SCCs (sodium sulfide, sodium thiosulfate, glutathione, dithiothreitol, cysteine) at micromolar sensitivities, combined with linear discriminant analysis. Validated in egg and milk matrices (recovery: 87.89-105.2%), this work establishes a multimetallic plasmonic nanozyme design to decouple catalytic enhancement mechanisms while delivering a robust platform for distinguishing structurally analogous analytes in complex samples.
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