Molecular Orientation and Structural Transformations in Phthalic Anhydride Thin Films on MgO(100)/Ag(100)

Beitrag in einer Fachzeitschrift

Details zur Publikation

Autor(en): Mohr S, Xu T, Döpper T, Laurin M, Görling A, Libuda J
Zeitschrift: Langmuir
Verlag: American Chemical Society
Jahr der Veröffentlichung: 2015
Band: 31
Heftnummer: 28
Seitenbereich: 7806-7814
ISSN: 0743-7463
eISSN: 1520-5827
Sprache: Englisch


Structural control of organic thin films on dielectric substrates is the key to tailoring the. physical properties of hybrid Materials, for example, for application in solar energy conversion, molecular electronics, or catalysis. In, this work, we investigate the molecular orientation of phthalic: anhydride (PAA) films on atomically well-defined mgO(100) on Ag(100) using temperature-programmed infrared reflection absorption spectroscopy (TP-IRAS) in combination with density-functional theory (DFT). A robust procedure is presented to determine the orientation of the FAA Molecules, which relies on the intensity ratios of vibrational bands only We show that even at deposition temperatures of 110 K, the PAA multilayer grows with a-Specific molecular, orientation; that is the PAA Molecular plane is preferentially aligned parallel with the MgO surface,. No change of molecular orientation occurs up to a temperature of 145 K Between 145 and 160 K, the film restructures adopting a nearly flat lying molecular Orientation. Between 170 and 205 K, the film undergoes a second structural transition to a crystalline phase. This transition is associated with a pronounced molecular reorientation. The molecules adopt a tilted orientation and, simultaneously, rotate around their C-2 axes The reorientation behavior Suggests that the molecular orientation in the crystalline phase is controlled by the interaction with the MgO(100) substrate. At higher temperature, no further restructuring is observed until the PAA. multilayer desorbs at temperatures above 230 K.

FAU-Autoren / FAU-Herausgeber

Döpper, Tibor
Lehrstuhl für Theoretische Chemie
Görling, Andreas Prof. Dr.
Lehrstuhl für Theoretische Chemie
Laurin, Mathias Dr.
Lehrstuhl für Physikalische Chemie II
Libuda, Jörg Prof. Dr.
Professur für Physikalische Chemie
Mohr, Susanne
Lehrstuhl für Physikalische Chemie II
Xu, Tao
Lehrstuhl für Physikalische Chemie II

Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Mohr, S., Xu, T., Döpper, T., Laurin, M., Görling, A., & Libuda, J. (2015). Molecular Orientation and Structural Transformations in Phthalic Anhydride Thin Films on MgO(100)/Ag(100). Langmuir, 31(28), 7806-7814.

Mohr, Susanne, et al. "Molecular Orientation and Structural Transformations in Phthalic Anhydride Thin Films on MgO(100)/Ag(100)." Langmuir 31.28 (2015): 7806-7814.


Zuletzt aktualisiert 2018-10-08 um 05:09