Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/47509
Title: MOLECULAR MODIFICATION OF GRAPHENE
Authors: WONG SWEE LIANG
Keywords: graphene, organic molecules, silicon carbide, scanning tunnelling microscopy, photoemission spectroscopy
Issue Date: 15-Jul-2013
Source: WONG SWEE LIANG (2013-07-15). MOLECULAR MODIFICATION OF GRAPHENE. ScholarBank@NUS Repository.
Abstract: In this thesis, we investigate the modification of epitaxial graphene through the application of organic molecules. Using C60F48 as a fluorine source, fluorine intercalation is demonstrated and two states, namely semi-intercalated graphene and quasi-freestanding graphene are formed at different annealing temperatures. Low temperature scanning tunnelling microscopy and spectroscopy measurements reveal that the semi-intercalated graphene is periodically bonded to the substrate and displays a band gap of 280meV. The quasi-freestanding graphene is charge neutral and has a passivated Si-F interface. Photoemission spectroscopy (PES) confirms the electronic and structural observations. Synchrotron radiation was also used to induce fluorine dissociation from C60F36 molecules and selectively fluorinate graphene at specific positions. We investigated the efficiency of the method. Lastly, a bimolecular network made of 6T and F4-TCNQ molecules is formed to generate a periodic potential on graphene. Angular resolved PES is used to study its influence on the electronic band structure of graphene.
URI: http://scholarbank.nus.edu.sg/handle/10635/47509
Appears in Collections:Ph.D Theses (Open)

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