6533b839fe1ef96bd12a6e2b
RESEARCH PRODUCT
Characterization of Zirconium Phosphate/Polycation Thin Films Grown by Sequential Adsorption Reactions
Hyuk Nyun KimJohannes SchmittThomas E. MalloukSteven W. KellerGero Dechersubject
Aqueous solutionGeneral Chemical EngineeringInorganic chemistryIntercalation (chemistry)General ChemistryExfoliation jointchemistry.chemical_compoundchemistryX-ray photoelectron spectroscopyZirconium phosphateTransmission electron microscopyMonolayerMaterials ChemistryHydroxidedescription
Monolayer and multilayer thin films consisting of anionic α-zirconium phosphate (α-ZrP) sheets and polycations (poly(allylamine hydrochloride) (PAH), cytochrome c) were characterized by transmission electron microscopy (TEM), ellipsometry, UV−visible absorbance spectroscopy, reflectance FT-IR, XPS, and X-ray diffraction. Titration and powder X-ray diffraction experiments confirm that exfoliation of α-ZrP begins to occur when enough tetra(n-butylammonium) hydroxide (TBA+OH-) has been added to exceed single-layer packing of TBA+ ions (x ≈ 0.50) in the intercalation compound Zr(HPO4)2-x(TBA+PO4-)x·nH2O. The identical contrast of many sheets in TEM micrographs suggests that the suspension is unilamellar. Alternately dipping cationic substrates into α-ZrP-containing suspensions and aqueous PAH gives a multilayer film that resembles the corresponding bulk intercalation compound. X-ray photoelectron spectra of multilayer films show that they are Zr-rich, relative to α-ZrP, consistent with some corrosion during t...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-06-01 | Chemistry of Materials |