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- Title
2D Zeolite Coatings: Langmuir-Schaefer Deposition of 3 nm Thick MFI Zeolite Nanosheets.
- Authors
Rangnekar, Neel; Shete, Meera; Agrawal, Kumar Varoon; Topuz, Berna; Kumar, Prashant; Guo, Qiang; Ismail, Issam; Alyoubi, Abdulrahman; Basahel, Sulaiman; Narasimharao, Katabathini; Macosko, Christopher W.; Mkhoyan, K. Andre; Al-Thabaiti, Shaeel; Stottrup, Benjamin; Tsapatsis, Michael
- 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.
- Subjects
SUSPENSIONS (Chemistry); ZEOLITES; SILICON wafers; X-ray diffraction; CALCINATION (Heat treatment)
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 22, p6671
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201411791