Nanostructure templating in inorganic solids with organic lyotropic liquid crystals

Paul V. Braun, Paul Osenar, Valeria Tohver, Scott B. Kennedy, Samuel I Stupp

Research output: Contribution to journalArticle

219 Citations (Scopus)

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 superlattice morphology of the nanostructured systems in contact with the mesophase was found to be thermodynamically stable with respect to the solid lacking nanoscale features. We also found that both the morphology of features 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, while Ag2S, CuS, HgS, and PbS were produced only as nonfeatured solids using identical synthetic methodologies. We 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.

Original languageEnglish
Pages (from-to)7302-7309
Number of pages8
JournalJournal of the American Chemical Society
Volume121
Issue number32
DOIs
Publication statusPublished - Aug 18 1999

Fingerprint

Liquid Crystals
Nanostructures
Liquid crystals
Minerals
Amphiphiles
Superlattices
Semiconductor growth
Ions
Semiconductors
Water
Growth
Molecular Structure
Ether
Oxides
Water content
Molecular structure
Ethers
Salts
Molecules

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Nanostructure templating in inorganic solids with organic lyotropic liquid crystals. / Braun, Paul V.; Osenar, Paul; Tohver, Valeria; Kennedy, Scott B.; Stupp, Samuel I.

In: Journal of the American Chemical Society, Vol. 121, No. 32, 18.08.1999, p. 7302-7309.

Research output: Contribution to journalArticle

Braun, Paul V. ; Osenar, Paul ; Tohver, Valeria ; Kennedy, Scott B. ; Stupp, Samuel I. / Nanostructure templating in inorganic solids with organic lyotropic liquid crystals. In: Journal of the American Chemical Society. 1999 ; Vol. 121, No. 32. pp. 7302-7309.
@article{c7428ecd6c194cc6b58a443747b75eb8,
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 superlattice morphology of the nanostructured systems in contact with the mesophase was found to be thermodynamically stable with respect to the solid lacking nanoscale features. We also found that both the morphology of features 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, while Ag2S, CuS, HgS, and PbS were produced only as nonfeatured solids using identical synthetic methodologies. We 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.",
author = "Braun, {Paul V.} and Paul Osenar and Valeria Tohver and Kennedy, {Scott B.} and Stupp, {Samuel I}",
year = "1999",
month = "8",
day = "18",
doi = "10.1021/ja9833725",
language = "English",
volume = "121",
pages = "7302--7309",
journal = "Journal of the American Chemical Society",
issn = "0002-7863",
publisher = "American Chemical Society",
number = "32",

}

TY - JOUR

T1 - Nanostructure templating in inorganic solids with organic lyotropic liquid crystals

AU - Braun, Paul V.

AU - Osenar, Paul

AU - Tohver, Valeria

AU - Kennedy, Scott B.

AU - Stupp, Samuel I

PY - 1999/8/18

Y1 - 1999/8/18

N2 - 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 superlattice morphology of the nanostructured systems in contact with the mesophase was found to be thermodynamically stable with respect to the solid lacking nanoscale features. We also found that both the morphology of features 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, while Ag2S, CuS, HgS, and PbS were produced only as nonfeatured solids using identical synthetic methodologies. We 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.

AB - 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 superlattice morphology of the nanostructured systems in contact with the mesophase was found to be thermodynamically stable with respect to the solid lacking nanoscale features. We also found that both the morphology of features 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, while Ag2S, CuS, HgS, and PbS were produced only as nonfeatured solids using identical synthetic methodologies. We 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.

UR - http://www.scopus.com/inward/record.url?scp=0033581180&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033581180&partnerID=8YFLogxK

U2 - 10.1021/ja9833725

DO - 10.1021/ja9833725

M3 - Article

AN - SCOPUS:0033581180

VL - 121

SP - 7302

EP - 7309

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 32

ER -