Copper Benzenetricarboxylate Metal–Organic Framework Nucleation Mechanisms on Metal Oxide Powders and Thin Films formed by Atomic Layer Deposition
| Autor: | Mark D. Losego, Gregory N. Parsons, Gregory W. Peterson, Paul C. Lemaire, Sarah D. Shepherd, Philip S. Williams, Junjie Zhao, Howard J. Walls |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Solvothermal synthesis Inorganic chemistry Nucleation Oxide 02 engineering and technology Substrate (electronics) Microporous material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Atomic layer deposition chemistry.chemical_compound chemistry General Materials Science Metal-organic framework Thin film 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 8:9514-9522 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | Chemically functional microporous metal-organic framework (MOF) crystals are attractive for filtration and gas storage applications, and recent results show that they can be immobilized on high surface area substrates, such as fiber mats. However, fundamental knowledge is still lacking regarding initial key reaction steps in thin film MOF nucleation and growth. We find that thin inorganic nucleation layers formed by atomic layer deposition (ALD) can promote solvothermal growth of copper benzenetricarboxylate MOF (Cu-BTC) on various substrate surfaces. The nature of the ALD material affects the MOF nucleation time, crystal size and morphology, and the resulting MOF surface area per unit mass. To understand MOF nucleation mechanisms, we investigate detailed Cu-BTC MOF nucleation behavior on metal oxide powders and Al2O3, ZnO, and TiO2 layers formed by ALD on polypropylene substrates. Studying both combined and sequential MOF reactant exposure conditions, we find that during solvothermal synthesis ALD metal oxides can react with the MOF metal precursor to form double hydroxy salts that can further convert to Cu-BTC MOF. The acidic organic linker can also etch or react with the surface to form MOF from an oxide metal source, which can also function as a nucleation agent for Cu-BTC in the mixed solvothermal solution. We discuss the implications of these results for better controlled thin film MOF nucleation and growth. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|