Multicomponent self-assembly of C\(_{60}\)/C\(_{70}\)-decanethiol systems

Li, Bosheng ORCID: 0000-0002-8510-4006 (2025). Multicomponent self-assembly of C\(_{60}\)/C\(_{70}\)-decanethiol systems. University of Birmingham. Ph.D.

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Abstract

This study investigates the self-assembly of C\(_{70}\) fullerene and decanethiol (DT) molecules on Au(111) substrates, focusing on the influence of different factors (molecular symmetry, intermolecular interactions, deposition methods, etc) in forming ordered nanostructures. Utilizing the low-temperature scanning tunnelling microscopy (LT-STM) in an ultra-high vacuum environment, I characterize the bicomponent C\(_{70}\)/DT system at room temperature (RT) and low temperature (LT) conditions (290 K and 77 K). Two primary self-assembled structures, dimer row and porous framework, are observed, with their formation driven by van der Waals forces and sulfur-gold bonding. Intramolecular LT-STM data reveals the molecular orientations of C\(_{70}\), enabling the construction of structural models for C\(_{70}\)/DT system, though the uncertainties necessitate further refinement. Additionally, mixed C\(_{60}\)-C\(_{70}\)/DT system demonstrate that both fullerenes adapt their orientations to form guided supramolecular frameworks, highlighting the role of molecular geometry and deposition methods in controlling molecular assembly. These findings advance the understanding of C\(_{70}\)-based self-assembly mechanisms and their potential applications in molecular electronics, sensors, and surface engineering.

Type of Work:

Thesis (Doctorates > Ph.D.)

Award Type:

Doctorates > Ph.D.

Supervisor(s):