As
a new type of nanomaterial, DNA-templated silver nanoclusters
(DNA-AgNCs) have been widely studied because of their fluorescence
and antibacterial properties. In this study, we combined the DNA-AgNCs
with aptamers of bacteria to achieve a novel approach for the visual
detection and effective elimination of bacteria. The aptamers of Staphylococcus aureus (S. aureus) were linked to G-rich sequences to achieve fluorescence enhancement
when approaching the DNA-AgNCs. The capture of aptamers not only realized
the visual monitoring of bacteria but also promoted the antibacterial
effects. Additionally, a fluorescent nanofilm with excellent selectivity
and antibacterial activity in the detection and elimination of S. aureus was developed based on the DNA-AgNCs. These
aptamer-functionalized DNA-AgNCs show significant potential for many
applications in food packaging and biomedical engineering.
Realizing high‐precise and adjustable regulation of engineering nanozyme is important in nanotechnology. Here, Ag@Pt nanozymes with excellent peroxidase‐like and antibacterial effects are designed and synthesized by nucleic acid and metal ions coordination‐driven one‐step rapid self‐assembly. The adjustable NA‐Ag@Pt nanozyme is synthesized within 4 min using single‐stranded nucleic acid as templates, and peroxidase‐like enhancing FNA‐Ag@Pt nanozyme is received by regulating functional nucleic acids (FNA) based on NA‐Ag@Pt nanozyme. Both Ag@Pt nanozymes that are developed not only has simple and general synthesis approaches, but also can produce artificial precise adjustment and possess dual‐functional. Moreover, when lead ion‐specific aptamers as FNA are introduced to NA‐Ag@Pt nanozyme, the Pb2+ aptasensor is successfully constructed by increasing electron conversion efficiency and improving the specificity of nanozyme. In addition, both nanozyme has good antibacterial properties, with ~100% and ~85% antibacterial efficiency against Escherichia coli and Staphylococcus aureus, respectively. This work provides a synthesis method of novelty dual‐functional Ag@Pt nanozymes and successful application in metal ions detection and antibacterial agents.
Lithium–sulfur (Li–S) batteries have been regarded as promising next‐generation energy‐storage devices owing to their inherently high theoretical energy density. Unfortunately, the poor capacity and cycling life caused by severe polysulfide shuttle effect and sluggish redox kinetics in sulfur cathodes greatly impede the practical application of Li–S batteries. Herein, a new class of nanonetwork‐structured carbon decorated with oxygen‐vacancy‐containing cerium oxide nanoparticles (NSC–CeO2−x), in which carbon skeleton is composed of highly conductive carbon nanotube core welded by hybrid carbon shell, has been developed via one‐step heating treatment of hybrid molecular brush and further employed as functional interlayer to modify separator of Li–S battery. Owing to the synergistic effect of the highly active CeO2−x nanoparticles and the three‐dimensional carbon nanonetwork in enhancing the preservation of the soluble polysulfides and boosting the redox kinetics of sulfur species, the NSC–CeO2−x significantly promotes the electrochemical performance of sulfur cathode. As a result, the as‐constructed Li–S batteries exhibit an ultrahigh initial sulfur utilization of 92.9% and an extremely large capacity of 751 mA h g−1 at a high rate of 5 C. Remarkably, a stable capacity of 728 mA h g−1 over 300 cycles at 1 C is also achieved.
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