Cassidy, A;
Jorgensen, MRV;
Rosu-Finsen, A;
Lasne, J;
Jorgensen, JH;
Glavic, A;
Lauter, V;
... Field, D; + view all
(2016)
Dipole-Oriented Molecular Solids Can Undergo a Phase Change and Still Maintain Electrical Polarization.
Journal of Physical Chemistry C
, 120
(42)
pp. 24130-24136.
10.1021/acs.jpcc.6b07296.
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Abstract
It has recently been demonstrated that nanoscale molecular films can spontaneously assemble to self-generate intrinsic electric fields that can exceed 108 V/m. These electric fields originate from polarization charges in the material that arise because the films self-assemble to orient molecular dipole moments. This has been called the spontelectric effect. Such growth of spontaneously polarized layers of molecular solids has implications for our understanding of how intermolecular interactions dictate the structure of molecular materials used in a range of applications, for example, molecular semiconductors, sensors, and catalysts. Here we present the first in situ structural characterization of a representative spontelectric solid, nitrous oxide. Infrared spectroscopy, temperature-programmed desorption, and neutron reflectivity measurements demonstrate that polarized films of nitrous oxide undergo a structural phase transformation upon heating above 48 K. A mean-field model can be used to describe quantitatively the magnitude of the spontaneously generated field as a function of film-growth temperature, and this model also recreates the phase change. This reinforces the spontelectric model as a means of describing long-range dipole–dipole interactions and points to a new type of ordering in molecular thin films
| Type: | Article |
|---|---|
| Title: | Dipole-Oriented Molecular Solids Can Undergo a Phase Change and Still Maintain Electrical Polarization |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acs.jpcc.6b07296 |
| Publisher version: | https://doi.org/10.1021/acs.jpcc.6b07296 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10054152 |
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