Circularly polarized luminescence (CPL) as an intriguing luminescence phenomenon has attracted significant research interests for their chiroptical application, and CPL-active materials have been extensively explored in recent years. Herein, a highly chiroptical sensor was fabricated by the coassembly of Gquartet nanofiber and gold−silver bimetallic nanoclusters. In this, the adenosine 5′-monophosphate (AMP) templated gold−silver bimetallic nanoclusters (AuAg NCs) exhibited an enhanced fluorescence (λ ex = 356 nm, λ em = 475 nm), a 9.42% quantum yield, and a 3.8 μs decay time compared with AMP stabilized Au NCs. In addition, a helical G-quartet-based nanofiber structure (gfiber) was formed based on the self-assembly of guanosine 5′monophosphate (GMP). The g-fiber was employed as chiral template for CPL emission by decorating AuAg NCs. Most interesting, the opposite CPL emission was regulated by K + ion. The dissymmetry factor (g lum ) of this CPL-active material was up to 10 −2 . Furthermore, a CPL sensor based on the CPL emission has been developed for L-cysteine detection due to the quenching effect on AuAg NCs. The limit of detection (LOD) was as low as 95.7 nM, ranging from 0.1 to 8 μmol L −1 , which was comparable with other analytical methods and materials. Our design presents a new horizon for nanoclusters and provides an entirely new approach for bioassay application.
Recent progress in DNA-based nanomaterials is summarized, ranging from applications in biosensors, biomedicine/imaging, and molecular logic gates to emerging nanomachines, as well as future perspective discussions.
β-lactoglobulin amyloid fibrils (BLGF) capped gold nanoclusters (Au NCs) with red, green and blue emissions were fabricated via pH dependent reduction strategy. The BLGF-Au NCs exhibit 3.2 times enhancement of...
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