Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Control of Moisture at Buried Polymer / Alumina Interfaces Through Subtrate Surface Modification

Published

Author(s)

B D. Vogt, Vivek M. Prabhu, Christopher L. Soles, Sushil K. Satija, Eric K. Lin, Wen-Li Wu

Abstract

Moisture absorption in poly(4-tert-butoxycarbonyl-oxystyrene) (PBOCSt) films supported on Al2O3 sputter coated silicon wafers is measured using neutron and x-ray reflectivity. Accumulation of water at the interface during moisture exposure results in film thickness dependent swelling for ultrathin PBOCSt films. The swelling of a film on Al2O3 is less than the swelling of a film of the same thickness on SiOx for films thinner than 20 nm. This is due to comparatively less moisture accumulation at the Al2O3 / PBOCSt interface. A simple, zero adjustable parameter model consisting of a fixed water rich layer at the interface and bulk swelling through the remainder of the film describes the thickness dependent swelling. The influence of four different Al2O3 surface treatments on the moisture distribution within PBOCSt films was examined: bare Al2O3, t-butylphosphonic acid, phenylphosphonic acid, and n-octyltrichlorosilane. Both the phenyl and the octyl surface treatments reduce the accumulation of water at the polymer / substrate interface. The t-butyl treatment does not reduce the interfacial water concentration, presumably due to insufficient surface coverage
Citation
Langmuir
Volume
21
Issue
6

Keywords

interfaces, moisture barrier, reflectivity, thin films

Citation

Vogt, B. , Prabhu, V. , Soles, C. , Satija, S. , Lin, E. and Wu, W. (2005), Control of Moisture at Buried Polymer / Alumina Interfaces Through Subtrate Surface Modification, Langmuir, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852447 (Accessed November 6, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created March 15, 2005, Updated February 19, 2017