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2D Zeolite Coatings: Langmuir–Schaefer Deposition of 3 nm Thick MFI Zeolite Nanosheets
Author(s) -
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,
AlThabaiti Shaeel,
Stottrup Benjamin,
Tsapatsis Michael
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201411791
Subject(s) - zeolite , calcination , materials science , chemical engineering , layer (electronics) , coating , deposition (geology) , wafer , silicon , substrate (aquarium) , nanotechnology , metallurgy , organic chemistry , chemistry , catalysis , paleontology , oceanography , sediment , geology , biology , engineering
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.