Kinetic Monitoring of Block Copolymer Self-Assembly
Using In Situ Spectroscopic Ellipsometry
Posted on 2020-07-14 - 17:35
Understanding
the kinetic pathways of self-assembly in block copolymers (BCPs) has
been a long-standing challenge, mostly due to limitations of in situ
monitoring techniques. Here, we demonstrate an approach that uses
optical birefringence, determined by spectroscopic ellipsometry (SE),
as a measure of domain formation in cylinder- and lamellae-forming
BCP films. The rapid experimental acquisition time in SE (ca. 1 sec)
enables monitoring of the assembly/disassembly kinetics of BCP films
during solvent-vapor annealing (SVA). We demonstrate that upon SVA,
BCP films form ordered domains that are stable in the swollen state,
but disorder upon rapid drying. Surprisingly, the disassembly during
drying strongly depends on the duration of solvent exposure in the
swollen state, explaining previous observations of loss of order in
SVA processes. SE thus allows for decoupling of BCP self-assembly
and disordering that occurs during solvent annealing and solvent evaporation,
which is difficult to probe using other, slower techniques.
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Bilchak, Connor
R.; Govind, Shivajee; Contreas, Guillermo; Rasin, Boris; Maguire, Shawn M.; Composto, Russell J.; et al. (2020). Kinetic Monitoring of Block Copolymer Self-Assembly
Using In Situ Spectroscopic Ellipsometry. ACS Publications. Collection. https://doi.org/10.1021/acsmacrolett.0c00444
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AUTHORS (7)
CB
Connor
R. Bilchak
SG
Shivajee Govind
GC
Guillermo Contreas
BR
Boris Rasin
SM
Shawn M. Maguire
RC
Russell J. Composto
ZF
Zahra Fakhraai