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Title: Nanostructure templating in inorganic solids with organic lyotropic liquid crystals

Abstract

Various nanoscale semiconducting superlattices have been generated by direct templating in a lyotropic organic liquid crystal. These include superlattices of CdS, CdSe, and ZnS, templated in a liquid crystal formed by oligoethylene oxide oleyl ether amphiphiles and water. The semiconductor growth process copied the symmetry and characteristic dimensions of the original mesophase by avoiding growth of mineral within regularly spaced hydrophobic regions. The final product was a superlattice structure in which a mineral continuum was featured with hexagonally arranged cylindrical pores 2--3 nm in diameter and 5 nm apart. Most importantly, the super lattice morphology of the nanostructured systems in contact with the mesophase was found to be thermodynamically stable with respect to the solid lacking nanoscale features. The authors also found that both the morphology of feature in the nanostructured solids and their dimension can be controlled through the amphiphile's molecular structure and water content in the liquid crystal. The semiconducting solids CdS, CdSe, and ZnS were all directly templated, which Ag{sub 2}S, CuS, HgS, and PbS were produced only as nonfeatured solids using identical synthetic methodologies. The workers propose that interactions of polar segments in template molecules with the precipitated mineral and with its precursor ions are necessarymore » conditions for direct templating. This is based on the absence of templating in the more covalent minerals and also in the presence of salts known to bind precursor ions.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Northwestern Univ., Evanston, IL (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
20000035
Resource Type:
Journal Article
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 121; Journal Issue: 32; Other Information: PBD: 18 Aug 1999; Journal ID: ISSN 0002-7863
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MOLECULAR STRUCTURE; SUPERLATTICES; SEMICONDUCTOR MATERIALS; LIQUID CRYSTALS; CADMIUM SULFIDES; CADMIUM SELENIDES; ZINC SULFIDES

Citation Formats

Braun, P.V., Osenar, P., Tohver, V., Kennedy, S.B., and Stupp, S.I. Nanostructure templating in inorganic solids with organic lyotropic liquid crystals. United States: N. p., 1999. Web. doi:10.1021/ja9833725.
Braun, P.V., Osenar, P., Tohver, V., Kennedy, S.B., & Stupp, S.I. Nanostructure templating in inorganic solids with organic lyotropic liquid crystals. United States. doi:10.1021/ja9833725.
Braun, P.V., Osenar, P., Tohver, V., Kennedy, S.B., and Stupp, S.I. Wed . "Nanostructure templating in inorganic solids with organic lyotropic liquid crystals". United States. doi:10.1021/ja9833725.
@article{osti_20000035,
title = {Nanostructure templating in inorganic solids with organic lyotropic liquid crystals},
author = {Braun, P.V. and Osenar, P. and Tohver, V. and Kennedy, S.B. and Stupp, S.I.},
abstractNote = {Various nanoscale semiconducting superlattices have been generated by direct templating in a lyotropic organic liquid crystal. These include superlattices of CdS, CdSe, and ZnS, templated in a liquid crystal formed by oligoethylene oxide oleyl ether amphiphiles and water. The semiconductor growth process copied the symmetry and characteristic dimensions of the original mesophase by avoiding growth of mineral within regularly spaced hydrophobic regions. The final product was a superlattice structure in which a mineral continuum was featured with hexagonally arranged cylindrical pores 2--3 nm in diameter and 5 nm apart. Most importantly, the super lattice morphology of the nanostructured systems in contact with the mesophase was found to be thermodynamically stable with respect to the solid lacking nanoscale features. The authors also found that both the morphology of feature in the nanostructured solids and their dimension can be controlled through the amphiphile's molecular structure and water content in the liquid crystal. The semiconducting solids CdS, CdSe, and ZnS were all directly templated, which Ag{sub 2}S, CuS, HgS, and PbS were produced only as nonfeatured solids using identical synthetic methodologies. The workers propose that interactions of polar segments in template molecules with the precipitated mineral and with its precursor ions are necessary conditions for direct templating. This is based on the absence of templating in the more covalent minerals and also in the presence of salts known to bind precursor ions.},
doi = {10.1021/ja9833725},
journal = {Journal of the American Chemical Society},
issn = {0002-7863},
number = 32,
volume = 121,
place = {United States},
year = {1999},
month = {8}
}