2D Zeolite Coatings: Langmuir–Schaefer Deposition of 3 nm Thick MFI Zeolite Nanosheets |
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| Authors: | Neel Rangnekar Meera Shete Dr. Kumar Varoon Agrawal Dr. Berna Topuz Prashant Kumar Dr. Qiang Guo Issam Ismail Prof. Abdulrahman Alyoubi Prof. Sulaiman Basahel Dr. Katabathini Narasimharao Prof. Christopher W. Macosko Prof. K. Andre Mkhoyan Prof. Shaeel Al‐Thabaiti Prof. Benjamin Stottrup Prof. Michael Tsapatsis |
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| Affiliation: | 1. Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, MN 55455 (USA);2. Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, 21589 (Saudi Arabia);3. Department of Physics, Augsburg College, 2211 Riverside Avenue, Minneapolis, MN 55454 (USA) |
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| Abstract: | Stable suspensions of zeolite nanosheets (3 nm thick MFI layers) were prepared in ethanol following acid treatment, which partially removed the associated organic structure‐directing agent. Nanosheets from these suspensions could then be dispersed at the air–water interface and transferred to silicon wafers using Langmuir–Schaefer deposition. Using layer‐by‐layer deposition, control on coating thickness was demonstrated. In‐plane X‐ray diffraction (XRD) revealed that the deposited nanosheets contract upon calcination similar to bulk MFI crystals. Different methods for secondary growth resulted in preferentially oriented thin films of MFI, which had sub‐12‐nm thickness in certain cases. Upon calcination, there was no contraction detectable by in‐plane XRD, indicating well‐intergrown MFI films that are strongly attached to the substrate. |
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| Keywords: | Langmuir trough nanosheets surface chemistry thin films zeolites |
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