Surface chemical properties of nanoscale domains on UV-treated polystyrene-poly(methyl methacrylate) diblock copolymer films studied using scanning force microscopy

Langmuir : the ACS Journal of Surfaces and Colloids
Shaida Ibrahim, Takashi Ito

Abstract

This paper reports the surface chemical properties of ca. 20 nm wide domains on a UV-treated thin film of a polystyrene-poly(methyl methacrylate) diblock copolymer (PS-b-PMMA; 0.3 as the PMMA volume fraction). UV irradiation and subsequent acetic acid (AcOH) treatment were used for selectively etching horizontally aligned PMMA domains on a thin PS-b-PMMA film to obtain nanoscale trenches and ridges. The surface charge and hydrophilicity of the trenches (etched PMMA domains) and ridges (PS domains) were investigated using three approaches based on scanning force microscopy. Chemical force titration data with a COOH-terminated tip showed a prominent decrease in adhesion force from pH 3 to 4.5 due to electrostatic repulsion between negatively charged functional groups on the tip and film surface but could not clarify the difference in chemical properties between the two nanoscale domains. Friction force images in n-dodecane showed higher friction over etched PMMA and PS domains with an OH-terminated tip and a CH(3)-terminated tip, respectively, exhibiting higher hydrophilicity of the etched PMMA domains. In an atomic force microscopy image of a UV/AcOH-treated PS-b-PMMA film upon immersion in a ferritin solution, approximately 80%...Continue Reading

References

Oct 24, 2002·Journal of the American Chemical Society·Andrew S ZaluskyMarc A Hillmyer
Jul 13, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Nitin Kumar, Jong-in Hahm
Sep 22, 2005·Journal of the American Chemical Society·Javid Rzayev, Marc A Hillmyer
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Jan 30, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Nitin KumarJong-in Hahm
Jun 5, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Takashi ItoJ H Edgar
Jul 23, 2009·Journal of the American Chemical Society·Ja-Hyoung RyuS Thayumanavan
Feb 18, 2010·ACS Applied Materials & Interfaces·Eric E NuxollRonald A Siegel

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Citations

Dec 29, 2013·Journal of Colloid and Interface Science·Samira Jamil FayadRedouane Borsali
Dec 15, 2010·Journal of the Royal Society, Interface·Manuel L B PalacioBharat Bhushan
Jun 9, 2021·The Journal of Physical Chemistry. B·David H Cho, Jong-In Hahm
Feb 17, 2015·Chemical Reviews·Günther JutzAlexander Böker

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