TY  - JOUR
A1  - Park, Sungjune
A1  - Cheng, Xiao
A1  - Böker, Alexander
A1  - Tsarkova, Larisa
T1  - Hierarchical Manipulation of Block Copolymer Patterns on 3D Topographic Substrates: Beyond Graphoepitaxy
JF  - Advanced materials
N2  - Templates of complex nanopatterns in a form of hierarchically sequenced dots and stripes can be generated in block copolymer films on lithography-free 3D topographic substrates. The approach exploits thickness- and swelling-responsive morphological behavior of block copolymers, and demonstrates novel possibilities of topography-guided registration of nanopatterns due to periodic confinement and spontaneous orthogonal flow-fields.
Y1  - 2016
U6  - https://doi.org/10.1002/adma.201601098
SN  - 0935-9648
SN  - 1521-4095
VL  - 28
SP  - 6900
EP  - +
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Kathrein, Christine C.
A1  - Bai, Wubin
A1  - Nunns, Adam
A1  - Gwyther, Jessica
A1  - Manners, Ian
A1  - Böker, Alexander
A1  - Tsarkova, Larisa
A1  - Ross, Caroline A.
T1  - Electric field manipulated nanopatterns in thin films of metalorganic 3-miktoarm star terpolymers
JF  - Soft matter
N2  - We report the effect of electric field on the morphological transitions and ordering behavior of polyferrocenylethylmethylsilane block (PFEMS)-containing copolymers. By analyzing structures in solvent-annealed films of metalorganic sphere-and cylinder-forming diblock copolymers, as well as of 3-miktoarm polyisoprene-arm-polystyrene-arm-PFEMS (3 mu-ISF) terpolymers, we decouple two types of responses to the electric field: morphological transformations as a result of an increase in the volume fraction of the PFEMS block by oxidation of the ferrocenyl groups, and the orientation of the dielectric interfaces of microdomains parallel to the electric field vector. In the case of 3m-ISF, the former effect dominates at high electric field strengths which results in an unexpected cylinder-to-sphere transition, leading to a well-ordered hexagonal dot pattern. Our results demonstrate multiple tunability of ordered microdomain morphologies, suggesting future applications in nanofabrication and surface patterning.
Y1  - 2016
U6  - https://doi.org/10.1039/c6sm00451b
SN  - 1744-683X
SN  - 1744-6848
VL  - 12
SP  - 4866
EP  - 4874
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  -