Wang Xueqing, Yao Fanglan, Xu Pengcheng, Li Ming, Yu Haitao, Li Xinxin
State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
School of Microelectronics, University of Chinese Academy of Sciences, Beijing 100049, China.
Nano Lett. 2021 Feb 24;21(4):1679-1687. doi: 10.1021/acs.nanolett.0c04481. Epub 2021 Feb 3.
A quantitative structure-activity relationship (QSAR) is revealed based on the real-time sulfurization processes of ZnO nanowires observed via gas-cell transmission electron microscopy ( TEM). According to the TEM observations, the ZnO nanowires with a diameter of 100 nm (ZnO-100 nm) gradually transform into a core-shell nanostructure under SO 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 and ZnO-500 nm. The QSAR model is verified with heat of adsorption (-Δ°) 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 capture/storage; (ii) the ZnO-500 nm sample features good reversibility (RSD = 1.5%, = 3) for SO sensing, and the detection limit reaches 70 ppb.
基于通过气室透射电子显微镜（TEM）观察到的ZnO纳米线的实时硫化过程，揭示了一种定量结构-活性关系（QSAR）。根据TEM观察结果，直径为100 nm的ZnO纳米线（ZnO-100 nm）在SO气氛下逐渐转变为核壳纳米结构，并定量确定了壳层形成动力学。然而，在ZnO-500 nm样品表面仅观察到稀疏的纳米颗粒，这意味着SO与ZnO-500 nm之间的固-气相互作用较弱。通过吸附热（-Δ°）和像差校正TEM表征对QSAR模型进行了验证。在QSAR模型的指导下，探索了ZnO纳米材料的以下吸附/传感应用：（i）突破实验证明了ZnO-100 nm样品用于SO捕获/存储的应用潜力；（ii）ZnO-500 nm样品对SO传感具有良好的可逆性（RSD = 1.5%， = 3），检测限达到70 ppb。
