Three types of moiré patterns, denoted as α-, β-, and γ-patterns, were observed in the molecular self-assembly of 1,3,5-tris(4-cyanophenyl)benzene (TCPB) on HOPG. Their relative stability was studied through thermally induced phase transitions monitored in situ by scanning tunneling microscopy. The incommensurate γ-pattern is thermodynamically more stable than the commensurate α- and β-patterns. The preference in the γ-pattern was explained by a static distortion wave, which was exclusively observed in this pattern. Through the lateral relaxation of TCPB lattice, the free energy of the γ-pattern can be reduced with respect to that of the α- and β-moiré patterns. This investigation provides insights into the thermodynamics of surface-confined supramolecular systems where the molecular lattice is incongruent with the substrate.
Probing the Thermodynamics of Moiré Patterns in Molecular Self-Assembly at the Liquid–Solid Interface
Rosei, Federico
2022-01-01
Abstract
Three types of moiré patterns, denoted as α-, β-, and γ-patterns, were observed in the molecular self-assembly of 1,3,5-tris(4-cyanophenyl)benzene (TCPB) on HOPG. Their relative stability was studied through thermally induced phase transitions monitored in situ by scanning tunneling microscopy. The incommensurate γ-pattern is thermodynamically more stable than the commensurate α- and β-patterns. The preference in the γ-pattern was explained by a static distortion wave, which was exclusively observed in this pattern. Through the lateral relaxation of TCPB lattice, the free energy of the γ-pattern can be reduced with respect to that of the α- and β-moiré patterns. This investigation provides insights into the thermodynamics of surface-confined supramolecular systems where the molecular lattice is incongruent with the substrate.File | Dimensione | Formato | |
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