Highly active TiCT MXene nanoribbons@AuPt bimetallic nanozyme constructed in a "two birds with one stone" manner for colorimetric sensing of dipterex.

The bimetallic nanoparticles have received significant attention in the field of colorimetric sensing, while the majority of the previous methods for synthesizing such nanoparticles typically require the use of reducers and involve highly harsh synthesis conditions. In this work, the AuPt bimetallic nanoparticles (AuPtNPs) decorated TiCTNR nanohybrid (TiCTNR@AuPt) was firstly synthesized in a "two birds with one stone" manner. Innovatively, during the synthesis process, TiCTNR served as both reducing agent and supporting agent to prevent aggregation of bimetallic nanoparticles. Due to the good synergistic effect of AuPtNPs and the strong metal-support interaction between AuPtNPs and TiCTNR, the as-prepared TiCTNR@AuPt exhibited boosted peroxidase (POD)-like activity. In advantage of the exceptional POD-like activity, a cost-effective and sensitive colorimetric sensing platform was fabricated for dipterex detection with a broad linearity of 1.0 ng mL-1.0 μg mL and a low detection limit (0.479 ng mL). The detection of dipterex in insecticide samples also yielded favorable recoveries. Moreover, this approach provided a convenient and effective strategy to design and develop novel nanozymes via a "two birds with one stone" strategy.