Surface morphology diagram for cylinder-forming block copolymer thin films.

Content Provider	Semantic Scholar
Author	Zhang, Xiaohong Berry, Brian C. Yager, Kevin G. Kim, Sangcheol Jones, Ronald L. Satija, Sushil K. Pickel, Deanna Lynn Douglas, Jack F. Karim, Alamgir
Copyright Year	2008
Abstract	We investigate the effect of the ordering temperature (T) and film thickness (h(f)) on the surface morphology of flow-coated block copolymer (BCP) films of asymmetric poly(styrene-block-methyl methacrylate). Morphology transitions observed on the ordered film surface by atomic force microscopy (AFM) are associated with a perpendicular to a parallel cylinder BCP microphase orientation transition with respect to the substrate with increasing h(f). "Hybrid" surface patterns for intermediate h(f) between these limiting morphologies are correspondingly interpreted by a coexistence of these two BCP microphase orientations so that two "transitional" h(f) exist for each T. This explanation of our surface patterns is supported by both neutron reflectivity and rotational SANS measurements. The transitional h(f) values as a function of T define upper and lower surface morphology transition lines, h(fu) (T) and h(fl) (T), respectively, and a surface morphology diagram that should be useful in materials fabrication. Surprisingly, the BCP film surface morphology depends on the method of film formation (flow-coated versus spun-cast films) so that nonequilibrium effects are evidently operative. This morphological variability is attributed primarily to the trapping of residual solvent (toluene) within the film (quantified by neutron reflectivity) due to film vitrification while drying. This effect has significant implications for controlling film structure in nanomanufacturing applications based on BCP templates.
Starting Page	290
Ending Page	297
Page Count	8
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://absimage.aps.org/image/MAR09/MWS_MAR09-2008-007559.pdf
Alternate Webpage(s)	https://www.ncnr.nist.gov/instruments/ng7refl/Publications/Zhang_ACSNano_2009sl.pdf
Alternate Webpage(s)	https://ncnr.nist.gov/programs/sans/pdf/publications/0748.pdf
PubMed reference number	19206400v1
Alternate Webpage(s)	https://doi.org/10.1021/nn800643x
DOI	10.1021/nn800643x
Journal	ACS nano
Volume Number	2
Issue Number	11
Language	English
Access Restriction	Open
Subject Keyword	Clinical Use Template Copolymer Mental Orientation Methacrylates Methylmethacrylate Microscopy, Atomic Force Mobitz type II atrioventricular block Neutrons Toluene Vitrification
Content Type	Text
Resource Type	Article