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| Home > Publications database > Untersuchung der Selbstassemblierung ligandenstabilisierter Magnetitnanopartikel mittels in-situ AFM-Messungen |
| Home > Publications database > Untersuchung der Selbstassemblierung ligandenstabilisierter Magnetitnanopartikel mittels in-situ AFM-Messungen |
| Bachelor Thesis | PUBDB-2025-04410 |
; ;
2021
Universität Hamburg
Hamburg
Abstract: The fact that some materials orient themselves in highly ordered structures and thusacquire special properties has been the subject of research for years. These high-orderstructures can be produced by top-down methods such as lithography or by bottom-upgrowth from individual particles to smaller agglomerates or monolayers. Self-assemblingNanoparticle structures, for example, exhibit special quantum mechanical effects due totheir size and shape. Even larger structures are characterized by special mechanical properties. They are often particularly hard and stable, as they contain hardly any defectsin the lattice structure and are packed very densely. For all these applications, it wouldbe worthwhile to better understand the process of self-assembly and to be able to use itfor one’s own purposes in order to be able to produce the optimal properties. The aim ofthis work is to investigate whether and how the particles arrange themselves in solution,without evaporation, coffee-ring effect or something like this. The bottom-up growth of aparticle monolayer is to be followed by means of in-situ AFM. For this purpose, magnetitenanoparticles were stabilized using oleyl phosphate as a ligand and dissolved in toluene.A strontium titanate crystal should serve as the substrate, which, thanks to a specialthermal and chemical treatment, has steps that should help the particles to attach. It wasthen examined how the monolayer spreads further and the criteria under which furtherparticles accumulate on the surface. It was found that the particles are usually not firmlybound to the substrate. Tip-induced shifts were observed. The particles that were solidand could be easily imaged showed a partly cubic and partly hexagonal arrangement.
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