Quantitative Structure-Activity Relationship of Nanowire Adsorption to SO<sub>2</sub> Revealed by <i>In Situ</i> TEM Technique.
basic_science · Level V
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- Record sourced from PubMed, PMID 33533628.
- Also identified by DOI 10.1021/acs.nanolett.0c04481.
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Abstract
A quantitative structure-activity relationship (QSAR) is revealed based on the real-time sulfurization processes of ZnO nanowires observed via gas-cell <i>in situ</i> transmission electron microscopy (<i>in situ</i> TEM). According to the <i>in situ</i> TEM observations, the ZnO nanowires with a diameter of 100 nm (ZnO-100 nm) gradually transform into a core-shell nanostructure under SO<sub>2</sub> atmosphere, and the shell formation kinetics are quantitatively determined. However, only sparse nanoparticles can be observed on the surface of the ZnO-500 nm sample, which implies a weak solid-gas interaction between SO<sub>2</sub> and ZnO-500 nm. The QSAR model is verified with heat of adsorption (-Δ<i>H</i>°) and aberration-corrected TEM characterization. With the guidance of the QSAR model, the following adsorbing/sensing applications of ZnO nanomaterials are explored: (i) breakthrough experiment demonstrates the application potential of the ZnO-100 nm sample for SO<sub>2</sub> capture/storage; (ii) the ZnO-500 nm sample features good reversibility (RSD = 1.5%, <i>n</i> = 3) for SO<sub>2</sub> sensing, and the detection limit reaches 70 ppb.