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Title: Generalized coating route to silica and titania films with orthogonally tilted cylindrical nanopore arrays.

Abstract

We describe a simple, inexpensive coating method to produce thin silica and titania films with surfactant templated, orthogonally tilted cylindrical nanopore arrays. These films can be deposited onto any substrate because orientation of the 2D hexagonally close packed (HCP) mesophases out of the plane of the film is directed by a chemically neutral sacrificial copolymer layer. Orientation of the HCP mesophases through the entire thickness of films cured in open air is achieved by limiting the coating thickness. This generalizes the coating method by making it possible to deposit oriented films on substrates of any curvature and size. We find a critical thickness between 70 and 100 nm, below which the triblock copolymer surfactant-templated HCP phase aligns completely out of the plane of glass and silicon wafer substrates. Above this thickness, the effect of the chemically neutral bottom layer does not propagate across the entire film, and alignment of the HCP mesophases parallel to the (nonpolar) air interface produces a mixed orientation.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
OSTI Identifier:
932938
Report Number(s):
ANL/XSD/JA-58108
TRN: US200814%%64
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Nano Lett.
Additional Journal Information:
Journal Volume: 6; Journal Issue: 11 ; Nov. 8, 2006
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; SURFACE COATING; SILICA; TITANIUM OXIDES; THIN FILMS; PORE STRUCTURE; NANOSTRUCTURES; ORIENTATION

Citation Formats

Koganti, V R, Dunphy, D, Gowrishankar, V, McGehee, M D, Li, X, Wang, J, Rankin, S E, X-Ray Science Division, Univ. of Kentucky, SNL,, and Stanford Univ. Generalized coating route to silica and titania films with orthogonally tilted cylindrical nanopore arrays.. United States: N. p., 2006. Web. doi:10.1021/nl061992v.
Koganti, V R, Dunphy, D, Gowrishankar, V, McGehee, M D, Li, X, Wang, J, Rankin, S E, X-Ray Science Division, Univ. of Kentucky, SNL,, & Stanford Univ. Generalized coating route to silica and titania films with orthogonally tilted cylindrical nanopore arrays.. United States. https://doi.org/10.1021/nl061992v
Koganti, V R, Dunphy, D, Gowrishankar, V, McGehee, M D, Li, X, Wang, J, Rankin, S E, X-Ray Science Division, Univ. of Kentucky, SNL,, and Stanford Univ. 2006. "Generalized coating route to silica and titania films with orthogonally tilted cylindrical nanopore arrays.". United States. https://doi.org/10.1021/nl061992v.
@article{osti_932938,
title = {Generalized coating route to silica and titania films with orthogonally tilted cylindrical nanopore arrays.},
author = {Koganti, V R and Dunphy, D and Gowrishankar, V and McGehee, M D and Li, X and Wang, J and Rankin, S E and X-Ray Science Division and Univ. of Kentucky and SNL, and Stanford Univ.},
abstractNote = {We describe a simple, inexpensive coating method to produce thin silica and titania films with surfactant templated, orthogonally tilted cylindrical nanopore arrays. These films can be deposited onto any substrate because orientation of the 2D hexagonally close packed (HCP) mesophases out of the plane of the film is directed by a chemically neutral sacrificial copolymer layer. Orientation of the HCP mesophases through the entire thickness of films cured in open air is achieved by limiting the coating thickness. This generalizes the coating method by making it possible to deposit oriented films on substrates of any curvature and size. We find a critical thickness between 70 and 100 nm, below which the triblock copolymer surfactant-templated HCP phase aligns completely out of the plane of glass and silicon wafer substrates. Above this thickness, the effect of the chemically neutral bottom layer does not propagate across the entire film, and alignment of the HCP mesophases parallel to the (nonpolar) air interface produces a mixed orientation.},
doi = {10.1021/nl061992v},
url = {https://www.osti.gov/biblio/932938}, journal = {Nano Lett.},
number = 11 ; Nov. 8, 2006,
volume = 6,
place = {United States},
year = {2006},
month = {11}
}