School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China.
School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China.
Chemosphere. 2023 Feb;314:137670. doi: 10.1016/j.chemosphere.2022.137670. Epub 2022 Dec 27.
The detection of hydrogen sulfide (HS) is critical because of its potential harm and widespread presence in the oil and gas sectors. The zeolitic imidazolate framework-8 (ZIF-8) derived ZnO nanostructures manufactured as gas sensors have exceptional sensitivity and selectivity for HS gas. In/Zn-ZIF-8 template material was synthesized by a simple one-step co-precipitation method followed by thermal annealing in air. The heat treatment resulted in InO/ZnO nanostructures with mixed heterostructures. The crystal structure (XRD), morphology (SEM/TEM), chemical state (XPS), surface area (BET), etc were investigated to ascertain the nature of the as-prepared material. SEM imagery revealed that the as-prepared InO/ZnO sensitive material had a microstructure of porous hollow nanocages with an average particle size of about 200 nm, which is beneficial to the diffusion and adsorption of gas molecules. The gas sensing performance test results of the InO/ZnO hollow nanocages show that their response to HS gas is significantly improved 67.5 @50 ppm HS (about 11 times that of pure ZnO nanocages) at an optimal temperature of 200 °C, better selectivity, lower theoretical detection limit and good linearity between gas concentration and response values. The enhanced gas sensing feat to HS gas is mainly attributed to the formation of n-n heterojunction and the wide surface area of the newly formed InO/ZnO porous hollow nanocages.
硫化氢（HS）的检测至关重要，因为它在石油和天然气领域具有潜在的危害和广泛的存在。沸石咪唑酯骨架-8（ZIF-8）衍生的 ZnO 纳米结构作为气体传感器制造，对 HS 气体具有出色的灵敏度和选择性。采用简单的一步共沉淀法合成了 In/Zn-ZIF-8 模板材料，然后在空气中进行热退火。热处理导致 InO/ZnO 纳米结构具有混合异质结构。通过 X 射线衍射（XRD）、扫描电子显微镜/透射电子显微镜（SEM/TEM）、X 射线光电子能谱（XPS）、比表面积（BET）等研究了晶体结构、形貌、化学状态、表面等，以确定所制备材料的性质。SEM 图像显示，所制备的 InO/ZnO 敏感材料具有多孔空心纳米笼的微观结构，平均粒径约为 200nm，这有利于气体分子的扩散和吸附。InO/ZnO 空心纳米笼的气体传感性能测试结果表明，在 200°C 的最佳温度下，它们对 HS 气体的响应显著提高（约为纯 ZnO 纳米笼的 11 倍），达到 50ppm HS 时为 67.5，具有更好的选择性、更低的理论检测限以及气体浓度与响应值之间的良好线性关系。对 HS 气体的增强气体传感性能主要归因于 n-n 异质结的形成和新形成的 InO/ZnO 多孔空心纳米笼的大比表面积。
