Nanoscale Q -Resolved Phonon Dynamics in Block Copolymers

Bolmatov, Dima; Zhang, Qi; Soloviov, Dmytro; Li, Yuk Mun; Werner, Jörg G.; Suvorov, Alexey; Cai, Yong Q.; Wiesner, Ulrich; Zhernenkov, Mikhail; Katsaras, John

doi:10.1021/acsanm.8b01087

Title: Nanoscale Q -Resolved Phonon Dynamics in Block Copolymers

Journal Article · 04 September 2018 · ACS Applied Nano Materials

DOI: https://doi.org/10.1021/acsanm.8b01087 · OSTI ID:1561602

^[1];

^[2]; Soloviov, Dmytro ^[3]; Li, Yuk Mun ^[2];

^[4]; Suvorov, Alexey ^[5]; Cai, Yong Q. ^[5];

^[2];

^[5];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Cornell Univ., Ithaca, NY (United States)
Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation); NAS of Ukraine, Kyiv (Ukraine); Moscow Inst. of Physics and Technology (MIPT), Moscow (Russian Federation)
Harvard Univ., Cambridge, MA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Recently, responsive polymer-based structures have been researched extensively due to their unique ability to alter their physical properties upon exposure to external stimuli. Despite this, the nanoscale Q-resolved dynamic properties of these materials have barely been explored, which is limiting the development and applications of these materials. To address this issue, we used inelastic X-ray scattering (IXS) and found evidence for van der Waals mediated molecular vibration-responsive rattling dynamics in bulk poly(isoprene-block-styrene) (SI) and poly(styrene-block-ethylene oxide) (SO) stacked thin film block copolymers. Their cylinder-forming hexagonally arranged static structures were characterized using small-angle X-ray scattering (SAXS) and grazing incidence small-angle X-ray scattering (GISAXS), complemented by scanning electron microscopy (SEM). Specifically, we observed that the longitudinal vibrational mode in bulk SI experiences a strong phonon attenuation as temperature increases from 30 to 90 °C, while the transverse phonon excitations are nonexistent in the measured Q-range due to anharmonicity-mediated symmetry breaking in phonon interactions. Additionally, the emergent transverse acoustic phonon modes in both the bulk SI and SO thin films exhibited a nondispersive behavior with a nearly zero slope in the hydrodynamic limit (Q → 0), mimicking optical phonon excitations (i.e., standing waves). In summary, these findings point to the use of polymeric materials for Q-resolved nanoacoustic sensing, and the visualization of THz phonons.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; SC0012704

OSTI ID:: 1561602

Alternate ID(s):: OSTI ID: 1767425

Report Number(s):: BNL-221090-2021-JAAM

Journal Information:: ACS Applied Nano Materials, Vol. 1, Issue 9; ISSN 2574-0970

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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