Assembly of thin film dielectrics by sequential adsorption reactions of unilamellar inorganic colloids

Mingming Fang, Chy Hyung Kim, Anthony C. Sutorik, David M. Kaschak, Thomas E. Mallouk

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Several layered inorganic materials (e.g. KCa2Nb3O10, KTiNbO5, and CsPb2Nb3O10) were prepared and their alkali cations exchanged by in aqueous acid. A fraction of the interlayer protons of HCa2Nb3O10 and HTiNbO5 can be replaced by tetra-n-butylammonium (TBA+), by reaction with TBA+OH-. Intercalation of a sufficient amount of TBA+ causes complete exfoliation, and single, nanometer-thick sheets of these materials are thus obtained. By sequential adsorption of these two-dimensional colloidal polyanions and polymeric cations, monolayer sheets of layered perovskites can be stacked on silicon surfaces to give thin films of any desired thickness. The layered materials, the exfoliated colloids, and the thin film multilayers on silicon were studied by X-ray diffraction, transmission electronic microscopy (TEM), ellipsometry, and atomic force microscopy (AFM). The dielectric properties of the related bulk materials were measured, and are also discussed.

Original languageEnglish (US)
Pages (from-to)377-381
Number of pages5
JournalMaterials Research Society Symposium - Proceedings
StatePublished - Jan 1 1997
EventProceedings of the 1996 MRS Fall Meeting - Boston, MA, USA
Duration: Dec 2 1996Dec 6 1996

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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