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Appl. Sci. 2018, 8(4), 503; doi:10.3390/app8040503

Stability of Two-Dimensional Polymorphs for 10,12-Pentacosadyn-1-ol on Graphite Investigated by SPM

1
Research Center for Structural Thermodynamics, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
2
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki 567-0047, Japan
*
Author to whom correspondence should be addressed.
Received: 16 February 2018 / Revised: 21 March 2018 / Accepted: 23 March 2018 / Published: 27 March 2018
(This article belongs to the Special Issue Quantum Materials)
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Abstract

For monomolecular layers of 10,12-pentacosadiyn-1-ol on graphite, it is known that two different two-dimensional polymorphic forms—herringbone (H) and parallel (P) arrangements—are observable at room temperature. Here, we study the thermodynamic stability of these polymorphs by scanning tunneling microscopy (STM) and atomic force microscopy. When the monomolecular films, where H and P domains coexist, are annealed at above 40 °C, the area of P arrangement irreversibly increases, demonstrating that P arrangement is thermodynamically stable while H arrangement is quasi-stable. Consistently, invasion of P domains into H domains is observed during morphological changes induced by STM scanning at room temperature. Furthermore, we estimate that the melting point of the monomolecular film of P arrangement is about 80 °C, which is 20 °C higher than that of the bulk crystal. View Full-Text
Keywords: adsorption; polymorphs; stabilization; STM; AFM adsorption; polymorphs; stabilization; STM; AFM
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Takajo, D.; Sudoh, K. Stability of Two-Dimensional Polymorphs for 10,12-Pentacosadyn-1-ol on Graphite Investigated by SPM. Appl. Sci. 2018, 8, 503.

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