Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session K11: One-Dimensional Materials
3:00 PM–5:00 PM,
Tuesday, March 5, 2024
Room: M100B
Sponsoring
Unit:
DCMP
Chair: Timothy Kidd
Abstract: K11.00010 : Two-dimensional self-assembled networks of aldehyde functionalized molecules*
4:48 PM–5:00 PM
Presenter:
Mark C Gallagher
(Lakehead University)
Authors:
Mark C Gallagher
(Lakehead University)
Hamzeh Nakhaei Niya
(Lakehead University)
Francis Agada
(Lakehead University)
Maryam Ebrahimi
(Lakehead University)
We have studied the self-assembly of a tetra-aldehyde substituted aromatic molecule (PTTA), on HOPG and the (111) surfaces of Au and Ag using scanning tunneling microscopy in both ultrahigh vacuum and at the solid-liquid interface.
Room temperature deposition of PTTA in UHV on Au(111) leads to a close-packed self-assembled network. The 2D layer is characterized by a one-molecule oblique unit cell defined by lattice vectors of 8 Å and 12 Å. A very similar structure is observed at the solid-liquid interface for a drop casted solution of PTTA in phenyloctane, a non-polar solvent, on HOPG. The similar unit cell on the two surfaces suggests that the PTTA network structure is determined primarily by molecule–molecule interactions. Changes in the structure as a function of annealing temperature, and results on the Ag(111) surface will also be discussed.
*Funded in part by the NSERC Discovery Grant Program. ME also acknowledges support from the New Frontiers in Research Fund-Exploration and the Canada Research Chair programs
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