ANSTO Publications Online >
Journal Publications >
Journal Articles >

Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/1630

Title: On the composition of the top layer of microphase separated thin PS-PEO films.
Authors: Neto, C
James, M
Telford, AM
Keywords: Atomic Force Microscopy
X-Ray Photoelectron Spectroscopy
Thin Films
Crystallization
Polystyrene
Copolymers
Issue Date: 14-Jul-2009
Publisher: American Chemical Society
Citation: Neto, C., James, M., & Telford, A. M. (2009). On the composition of the top layer of microphase separated thin PS-PEO films. Macromolecules, 42(13), 4801-4808.
Abstract: The topography and surface composition of thin films (ca. 100 nm) of a polystyrene-b-poly(ethylene oxide) (PS-PEO) block copolymer are investigated using a suite of complementary techniques, namely tapping mode atomic force microscopy (AFM), optical microscopy, X-ray photoelectron spectroscopy (XPS), neutron reflectometry, and wettability measurements. The copolymer films separate into lamellar structures oriented parallel to the silicon substrate, and bicontintious and island/hole morphologies characteristic of this arrangement appear. Even though the crystalline topography of the film's surface and its wettability properties suggest the presence of 11130 oil the top surface, XPS and neutron reflectometry data point undoubtedly to the presence of a top layer of PS at the air/film interface. Tapping mode AFM images unequivocally demonstrate that in air only one block is present at the air/film interface. Neutron reflectometry data identify the nature of each phase-separated layer within the film. This finding differs from a model of domain arrangement proposed in a classic and much-cited paper oil these systems (Macromolecules 1979, 12, 323). After exposure to water, PEO blocks rearrange and access the top surface of the film. After many hours of thermal annealing, both PS and PEO blocks can be made to appear at the film/air interface, within isolated droplets formed upon Film dewetting. © 2009, American Chemical Society
URI: http://dx.doi.org/10.1021/ma900690e
http://apo.ansto.gov.au/dspace/handle/10238/1630
ISSN: 0024-9297
Appears in Collections:Journal Articles

Files in This Item:

There are no files associated with this item.

Items in APO are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback