2D Zeolite Coatings: Langmuir-Schaefer Deposition of 3nm Thick MFI Zeolite Nanosheets

Rangnekar N., Shete M., Agrawal K. V., Topuz B., Kumar P., Guo Q., ...Daha Fazla

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, cilt.54, sa.22, ss.6571-6575, 2015 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 54 Sayı: 22
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1002/anie.201411791
  • Dergi Adı: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.6571-6575
  • Anahtar Kelimeler: Langmuir trough, nanosheets, surface chemistry, thin films, zeolites, BLODGETT TECHNIQUE, SECONDARY GROWTH, HIERARCHICAL ZEOLITES, FILMS, MONOLAYERS, MEMBRANES, FABRICATION, PRECURSORS, CATALYSTS, CRYSTALS
  • Ankara Üniversitesi Adresli: Evet

Özet

Stable suspensions of zeolite nanosheets (3nm 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.