Enhanced catalytic performance of DNA-templated silver nanosheets doped with gold and platinum

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Silver nanomaterials, owing to their excellent catalytic activity, ease of preparation, and low cost, hold significant promise in efficient catalysis. However, precisely regulating the structure of silver-based nanomaterials to enhance catalytic performance remains a key challenge in this field. In this study, we reported a strategy using DNA nanosheets (DNS) as a scaffold: through DNA self-assembly-mediated precise synthesis, silver nanosheets (DNS/AgNCs) were successfully prepared. Subsequently, Au or Pt was introduced into DNS/AgNCs via galvanic replacement, ultimately yielding uniformly dispersed bimetallic nanosheets DNS/Ag@MNCs (M is Au or Pt). Their catalytic performance was evaluated using ultraviolet visible spectra. Notably, the bimetallic DNS/Ag@MNCs exhibited significantly higher catalytic activity than the monometallic DNS/AgNCs, with DNS/Ag@PtNCs showing the best performance. Furthermore, we observed that DNS/Ag@PtNCs generate hydroxyl radicals during peroxidase-like catalysis. Based on this characteristic, a colorimetric sensor for dopamine detection in urine was developed, with a linear range of 0–150 μM and the limit of detection as low as 0.59 μM. This study not only provides a new technical approach for the controllable construction of metal nanostructures but also lays an important theoretical and experimental foundation for designing and developing high-performance silver-based catalysts. • Silver nanosheets (DNS/AgNCs) were successfully synthesized via DNA self-assembly. • Silver-based bimetallic nanosheets DNS/Ag@MNCs were successfully prepared. • DNS/Ag@MNCs exhibited significantly higher catalytic activity than DNS/AgNCs. • A colorimetric sensor for dopamine detection in urine was developed.

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