Anisotropic structure and transport in self-assembled layered polymer-clay nanocomposites

Jodie L. Lutkenhaus, Elsa A. Olivetti, Eric A. Verploegen, Bryan Cord, Donald R. Sadoway, Paula T. Hammond

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

Using the layer-by-layer (LbL) assembly technique, we create a polymer-clay structure from a unique combination of LbL materials: poly(ethylene imine), Laponite clay, and poly(ethylene oxide). This trilayer LbL structure is assembled using a combination of hydrogen bonding and electrostatic interactions. The films were characterized using ellipsometry, profilometry, X-ray photon spectroscopy, atomic force microscopy, scanning electron microscopy, wide-angle X-ray diffraction, grazing-incidence small-angle X-ray scattering, and electrochemical impedance spectroscopy (EIS). We observe a layered, anisotropic structure, which resulted in in-plane ion transport 100 times faster than cross-plane at 0% relative humidity. This study represents a first application of EIS in determining anisotropic ion transport in LbL assemblies and its correlation to structural anisotropy.

Original languageEnglish (US)
Pages (from-to)8515-8521
Number of pages7
JournalLangmuir
Volume23
Issue number16
DOIs
StatePublished - Jul 31 2007

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