Nanoscale Resolution of Electric-field Induced Motion in Ionic Diblock Copolymer Thin Films

Dugger, Jason W.; Li, Wei; Chen, Mingtao; Long, Timothy E.; Welbourn, Rebecca J. L.; Skoda, Maximilian W. A.; Browning, James F.; Kumar, Rajeev; Lokitz, Bradley S.

doi:10.1021/acsami.8b11220

Title: Nanoscale Resolution of Electric-field Induced Motion in Ionic Diblock Copolymer Thin Films

Journal Article · 03 September 2018 · ACS Applied Materials and Interfaces

DOI: https://doi.org/10.1021/acsami.8b11220 · OSTI ID:1513410

^[1]; Li, Wei ^[1]; Chen, Mingtao ^[2];

^[2];

^[3]; Skoda, Maximilian W. A. ^[3];

^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Rutherford Appleton Laboratory, Didcot (United Kingdom)

Understanding the responses of ionic block copolymers to applied electric fields is crucial when targeting applications in areas such as energy storage, microelectronics, and transducers. This work shows that the identity of counterions in ionic diblock copolymers substantially affects their responses to electric fields, demonstrating the importance of ionic species for materials design. In situ neutron reflectometry measurements revealed that thin films containing imidazolium based cationic diblock copolymers, tetrafluoroborate counteranions led to film contraction under applied electric fields, while bromide counteranions drove expansion under similar field strengths. Coarse-grained molecular dynamics simulations were used to develop a fundamental understanding of these responses, uncovering a nonmonotonic trend in thickness change as a function of field strength. Furthermore, this behavior was attributed to elastic responses of microphase separated diblock copolymer chains resulting from variations in interfacial tension of polymer–polymer interfaces due to the redistribution of counteranions in the presence of electric fields.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1513410

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 38 Vol. 10; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Nanoscale Resolution of Electric-field Induced Motion in Ionic Diblock Copolymer Thin Films

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