Macroscopic nanotemplating of semiconductor films with hydrogen-bonded lyotropic liquid crystals

Paul V. Braun, Paul Osenar, Mariusz Twardowski, Gregory N. Tew, Samuel I Stupp

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Aqueous gel-like lyotropic liquid crystals with extensive hydrogen bonding and nanoscale hydrophilic compartments have been used to define the growth of macroscopic nanotemplated CdS and CdTe thin films. These mesoporous semiconductor films contain a hexagonal array of 2.5 nm pores, 7 nm center-to-center, that extend in an aligned fashion perpendicular to the substrate. The CdS is deposited on a polypropylene substrate by a reaction between Cd(NO3)2 dissolved in the liquid crystal and H2S transported via diffusion through the substrate. The CdTe is electrodeposited on indium-tin-oxide-coated glass from TeO2 and Cd(NO3)2, both of which are dissolved in the liquid-crystal template. The porous nature of the CdTe films enables chemical transformations of the entire bulk of the film. As electrodeposited, the CdTe films are Te rich and, in contrast to a non-templated film, the excess Te could be removed via a chemical treatment, proving the continuity of the pores in the nanotemplated films. These results suggest that liquid-crystal lithography with hydrogen-bonding amphiphiles may be a useful approach to create materials with nanoscale features over macroscopic dimensions.

Original languageEnglish
Pages (from-to)1745-1750
Number of pages6
JournalAdvanced Functional Materials
Volume15
Issue number11
DOIs
Publication statusPublished - Nov 2005

Fingerprint

Liquid Crystals
Liquid crystals
Hydrogen
liquid crystals
Semiconductor materials
hydrogen
Hydrogen bonds
Substrates
porosity
Amphiphiles
Polypropylenes
compartments
Tin oxides
polypropylene
continuity
indium oxides
Indium
Lithography
tin oxides
templates

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Macroscopic nanotemplating of semiconductor films with hydrogen-bonded lyotropic liquid crystals. / Braun, Paul V.; Osenar, Paul; Twardowski, Mariusz; Tew, Gregory N.; Stupp, Samuel I.

In: Advanced Functional Materials, Vol. 15, No. 11, 11.2005, p. 1745-1750.

Research output: Contribution to journalArticle

Braun, Paul V. ; Osenar, Paul ; Twardowski, Mariusz ; Tew, Gregory N. ; Stupp, Samuel I. / Macroscopic nanotemplating of semiconductor films with hydrogen-bonded lyotropic liquid crystals. In: Advanced Functional Materials. 2005 ; Vol. 15, No. 11. pp. 1745-1750.
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