Atomically Precise Growth of Catalytically Active Cobalt Sulfide on Flat Surfaces and within a Metal鈥揙rganic Framework via Atomic Layer Deposition

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• 作者：Aaron W. Peters ; Zhanyong Li ; Omar K. Farha ; Joseph T. Hupp
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：August 25, 2015
• 年：2015
• 卷：9
• 期：8
• 页码：8484-8490
• 全文大小：496K
• ISSN：1936-086X

文摘

Atomic layer deposition (ALD) has been employed as a new synthetic route to thin films of cobalt sulfide on silicon and fluorine-doped tin oxide platforms. The self-limiting nature of the stepwise synthesis is established through growth rate studies at different pulse times and temperatures. Additionally, characterization of the materials by X-ray diffraction and X-ray photoelectron spectroscopy indicates that the crystalline phase of these films has the composition Co₉S₈. The nodes of the metal鈥搊rganic framework (MOF) NU-1000 were then selectively functionalized with cobalt sulfide via ALD in MOFs (AIM). Spectroscopic techniques confirm uniform deposition of cobalt sulfide throughout the crystallites, with no loss in crystallinity or porosity. The resulting material, CoS-AIM, is catalytically active for selective hydrogenation of m-nitrophenol to m-aminophenol, and outperforms the analogous oxide AIM material (CoO-AIM) as well as an amorphous CoS_x reference material. These results reveal AIM to be an effective method of incorporating high surface area and catalytically active cobalt sulfide in metal鈥搊rganic frameworks.