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Effects of Surface Functionality and Humidity on the Adhesion Force And Chemical Contrast Measured with AFM

Published online by Cambridge University Press:  01 February 2011

Tinh Nguyen
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
Xiaohong Gu
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
Lijiang Chen
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
Duangrut Julthongpiput
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
Michael Fasolka
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
Kimberly Briggman
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
Jeeseong Hwang
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
Jon Martin
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
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The ability to probe chemical heterogeneity with nanometer scale resolution is essential for developing a molecular–level understanding of a variety of phenomena occurring at surfaces of materials. One area that could benefit greatly from nanoscale chemical measurement is an understanding of the degradation mechanisms of polymeric materials exposed to the environment. For example, the degradation (photo and hydrolytic) of polymers and polymeric materials has been observed to occur non-uniformly in which nanometer pits form locally, which deepen and enlarge with exposure (1, 2). The pitting has been postulated to initiate in the hydrophilic degradation-susceptible regions of the films (3). However, due to the lack of spatial resolution of the most current surface analytical techniques, the chemical nature of the degradation-initiated locations has not been identified. The use of a chemically-functionalized probe in an AFM (chemical force microscopy CFM) (4) has been shown to be capable of discriminating chemically-different domains of self-assembled monolayer (SAM) surfaces at the nanoscale spatial resolution. This study provides data to demonstrate that, by using proper RH at the tip-sample environment, the contrast between the hydrophilic and hydrophobic domains in SAM and polymer samples can be discerned, and presents results on the effects of RH on tipsample adhesion forces for different substrates.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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References

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