Laminated TaS 2 /polymer nanocomposites through encapsulative precipitation of exfoliated layers

L. Wang, M. G. Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Several TaS 2 /polymer nanocomposites prepared through the encapsulative precipitation method are described. Namely, the encapsulation of poly(ethylene oxide) (PEO), polyethylene imine (PEI), and poly(vinylpyrrolidinone) (PVP) into TaS 2 was examined in detail, and the nanocomposites were characterized by a wide variety of techniques. The nanocomposites disperse in water and are easily cast into free-standing films. The flexible metallic TaS 2 / polymer nanocomposite films display bulk superconductivity. In addition, in this work the exfoliation properties of Li x TaS 2 were systematically explored, and it was found that material prepared from controlled lithiation with 0.2 equiv of LiBH 4 exfoliates well in water and has high affinity for various polymers. The likely conformation of PEO molecules sandwiched between the TaS 2 slabs was explored with analysis of the X-ray diffraction patterns of a highly oriented Li x (PEO) y TaS 2 nanocomposite films. The one-dimensional electron density maps, obtained for Li x (PEO) y TaS 2 , can be explained with two sheets of PEO chains (bilayer) that adopt a conformation similar to that found in a type II PEO-HgCl 2 complex. The chains are arranged with the -CH 2 - groups facing the TaS 2 layers and the -O- atoms toward the center of the gallery, where the Li + ions seem to be located. Solid state 7 Li NMR measurements indicate that Li x (PEO) y TaS 2 , provides a more facile hopping environment for Li ions than pristine Li x TaS 2 .

Original languageEnglish (US)
Pages (from-to)3717-3727
Number of pages11
JournalChemistry of Materials
Volume13
Issue number10
DOIs
StatePublished - Nov 7 2001

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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