Research Article Issue
Construction of highly dispersed Pt single sites and high-efficiency-heterocatalysis silylation of alcohols with silanes
Nano Research 2023, 16 (4): 4643-4649
Published: 02 November 2022
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The construction of silicon–oxygen bonds has been highlighted as an exciting achievement in organosilicon and green chemistry, but their synthetic efficiency has great improvement potential, so it is crucial to explore and achieve an effective approach for synthesizing such compounds. In this study, we successfully prepared the highly dispersed platinum single-atom catalyst (Pt SAC/N-C) through a coordination-assisted strategy with a mixture of ligands (H2bpdc and H2bpydc), which were used for the O-silylation of alcohols with silanes. The strong coordination between Pt2+ and the Pyridine N at the skeleton of UiO-67 plays a critical role in accessing the atomically isolated dispersion of Pt sites. Without the assistance of the H2bpydc ligands, the Pt/ UiO-67-bpdc precursor is prone to aggregation during the pyrolysis process, resulting in the formation of Pt nanoparticles. Aided by advanced characterization techniques of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption fine structure (XAFS) spectroscopy, it has been demonstrated that atomically dispersed Pt was formed on the UiO-67 through a local structure of four-coordinated Pt-N4, exhibiting a high actual Pt loading content (0.6962 wt.%). In the oxidation of silanes, the Pt SAC/N-C catalyst showed a high turnover frequency (TOF) value (up to 9,920 h−1) when the catalyst loading decreased to 0.005%. Excellent performance was maintained during recycling experiments, indicating high stability of the catalyst.

Research Article Issue
In situ decorating the surface and interlayer of montmorillonite with Co0.5Ni0.5Fe2O4 nanoparticles: A sustainable, biocompatible colorimetric platform for H2O2 and acetylcholine
Nano Research 2022, 15 (10): 9319-9326
Published: 24 June 2022
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Originated from nature and used for nature is a way of sustainable development. In this work, montmorillonite (MMT), a natural two-dimensional (2D) layered mineral, the surface and interlayer of which were nano-decorated by chemical synthesis technique was applied in biological detection field. Magnetic ferrite (Co0.5Ni0.5Fe2O4) was anchored on the surface and intercalated in the interlayer of montmorillonite, which served as a competitive candidate of enzyme mimics. Cytotoxicity test toward HUVEC and Hela cells verified the good biocompatibility of Co0.5Ni0.5Fe2O4-MMT, guaranteeing its safety in biological applications. Based on the peroxidase-like activity of Co0.5Ni0.5Fe2O4-MMT, a colorimetric sensing platform for H2O2 was established by a facile mix-and-detect approach with the detection limit of 0.565 μM (3σ/slope). It was implied that the peroxidase-like activity of Co0.5Ni0.5Fe2O4-MMT was originated from generation of ·OH and ·O2 produced from catalytic decomposition process of H2O2. Coupled with cascaded catalytic reactions of ACh, a facile and efficient sensing platform for ACh with satisfactory anti-interference ability was established. Thus, all these remarkable features highlighted the superiority of Co0.5Ni0.5Fe2O4-MMT, and endowed it with a powerful competitiveness in the fields of environmental assessing, biosensing, and disease monitoring.

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