薄膜
扫描电子显微镜
乙苯
石英晶体微天平
材料科学
拉曼光谱
吸附
化学工程
分析化学(期刊)
纳米孔
甲苯
化学
纳米技术
有机化学
复合材料
光学
物理
工程类
作者
Alankriti Bajpai,Daniel Speed,Greg Szulczewski
出处
期刊:Langmuir
[American Chemical Society]
日期:2022-07-27
卷期号:38 (31): 9518-9525
被引量:2
标识
DOI:10.1021/acs.langmuir.2c00816
摘要
Thin films of Co-MOF-74 and Ni-MOF-74 were synthesized on Au-coated quartz crystal microbalance substrates by a vapor-assisted conversion (VAC) method that precludes the need for activation via postsynthetic solvent exchange. All thin films were structurally characterized by powder X-ray diffraction, reflection–absorption infrared spectroscopy, and Raman spectroscopy. Scanning electron microscopy (SEM) images reveal that the Ni-MOF-74 films exists as a dense base layer with hemispherical protrusions on the surface. In contrast, the scanning electron microscopy images of the Co-MOF-74 thin films show a rough surface with spherical deposits. The thin film morphologies were different than the powders resulting from the bulk synthesis. Gravimetric vapor-phase adsorption measurements for xylene isomers and ethylbenzene within Co-MOF-74 and Ni-MOF-74 thin films were conducted, and the results were compared with those reported for the corresponding bulk powders. Despite different morphologies, the saturation capacities of Ni-MOF-74 and Co-MOF-74 thin films were found to be nearly equivalent to those reported for the bulk powders. The results demonstrate that the VAC method can produce MOF-74 thin films that retain the intrinsic properties that are observed in bulk powders.
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