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Study of a brominated triphenylamine derivative on metal and semiconducting surfaces

dc.contributor.authorMarchese, Davide
dc.date.accessioned2020-10-23T14:10:05Z
dc.date.available2020-10-23T14:10:05Z
dc.date.created2020
dc.date.issued2020
dc.identifier.urihttp://knowledgecommons.lakeheadu.ca/handle/2453/4714
dc.description.abstractRoom-temperature STM experiments were conducted for tribromotrioxoazatriangulene, (TBTANGO), on three surfaces: Si(111)-√3x√3-R30o-B, Ag(111), and Au(111) on mica. We found for the silicon samples there was a trade-off between attaining sufficient boron to passivate surface while remaining contamination free. STM imaging shows TBTANGO fragments were decomposed by surface dangling bonds. Of the procedures tested to prepare an atomically clean but passive surface, flashing near 1200oC, followed by annealing for 100 minutes at 930oC was the best. The (111) face of silver was explored at room-temperature and elevated-temperature as a molecular substrate. Both instances showed that TBTANGO forms two-dimensional organometallic structures. At room-temperature, short oligomers were formed. With the silver crystal at 240oC, large organometallic SAMNs were formed. The molecules formed a honeycomb organometallic network with trapped bromine atoms within many of the pores. The honeycomb cell of TBTANGO on hot silver is commensurate with the underlying substrate within error. The cell is s1 = 19.8 Å, s2 = 19.8 Å, θ = 60.3o. The pore-to-pore separation distance calculated by gas phase density functional theory was ~22.1 Å. The deposition of TBTANGO on hot silver also supported a close-packed phase believed to be an organometallic SA with 3 metal-carbon links. Thin films of Au(111) terminated facets supported the self-assembly of TBTANGO at a substrate temperature of 180oC. The unit cell was measured to be s1 = 10.5 Å, s2 = 10.5 Å, θ = 59.2o. Theoretical calculations for the self-assembled cell are s1 = 13.3 Å, s2 = 13.3 Å, θ = 60o. The discrepancy between the measured is attributed to STM drift.en_US
dc.language.isoen_USen_US
dc.subjectNanomaterial researchen_US
dc.subjectTribromotrioxoazatriangulene moleculeen_US
dc.subjectNanostructuresen_US
dc.subjectMolecular deposition and self-assemblyen_US
dc.subjectNanoarchitectonicsen_US
dc.titleStudy of a brominated triphenylamine derivative on metal and semiconducting surfacesen_US
dc.typeThesisen_US
etd.degree.nameMaster of Scienceen_US
etd.degree.levelMasteren_US
etd.degree.disciplinePhysicsen_US
etd.degree.grantorLakehead Universityen_US


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