Detection of Harmful Gases by Copper-Containing Metal鈥揙rganic Framework Films

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• 作者：Xiaoqin Zou ; Jean-Michel Goupil ; S茅bastien Thomas ; Feng Zhang ; Guangshan Zhu ; Valentin Valtchev ; Svetlana Mintova
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：August 9, 2012
• 年：2012
• 卷：116
• 期：31
• 页码：16593-16600
• 全文大小：501K
• 年卷期：v.116,no.31(August 9, 2012)
• ISSN：1932-7455

文摘

The stabilization of copper clusters in nanosized metal鈥搊rganic framework crystals, Cu-Y(BTC), was achieved by a solvent-exchange approach, followed by hydrogen reduction. The formation of copper clusters in the Y(BTC) nanocrystals generated during the hydrogen reduction process was followed by UV鈥搗is spectroscopy. The Cu-Y(BTC) nanocrystals were further assembled in thin films with a thickness of 250 nm. The distribution and size of the copper clusters in the films were studied by CO chemisorption, followed by FT-IR spectroscopy combined with transmission electron microscopy. It was shown that the copper clusters with a mean diameter of 6 nm were homogeneously distributed and stabilized in the Cu-Y(BTC) films. Further, the Cu-Y(BTC) films were utilized for detection of single harmful gases, such as CO, chloroform, and 2-ethylthiophene, or mixtures of two compounds. The high sensitivity, selectivity, and reversibility of the Cu-Y(BTC) films toward single CO, chloroform, and 2-ethylthiophene were demonstrated. Noteworthy, the Cu-Y(BTC) films exhibited a fast response toward CO, even in the presence of chloroform and 2-ethylthiophene, which was due to the high activity and accessibility of copper clusters. The response of Cu-Y(BTC) toward 2-ethylthiophene was slower in comparison with chloroform, which was attributed to the bigger size and higher viscosity of 2-ethylthiophene.