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# Structural analysis of self‐assembled monolayers on Au(111) and point defects on HOPG

Gao, Jianzhi (2013)
Ph.D. thesis, University of Birmingham.

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## Abstract

In this thesis, I report findings from two projects conducted from Oct. 2009 to Dec. 2012. The first project involves the structural analysis of short-chain alkanethiol self-assembled monolayers (SAMs) on Au(111). Methanethiol, ethanethiol, propanethiol, and methyl-propanethiol monolayers are prepared on the Au(111) surface using vapour deposition. The SAMs are imaged using scanning tunnelling microscopy (STM) and structural transformations are followed as a function of surface coverage. The second project involves the creation and detection of various types of point defects on the surface of graphite with a view to obtain controlled doping in graphene and graphene-related materials. Nitrogen and oxygen are deposited onto HOPG using two different methods. Charged N and N$$_2$$ were used from an ion source and shallowly implanted into HOPG. Several types of N were found, including interstitial and substitutional N. Oxygen was deposited as atomic O from a thermal cracking source. We found oxygen bonded to surface carbon atoms in both a top and bridging configurations. We have also investigated the deposition of small PtO particles on HOPG.

Type of Work: Ph.D. thesis. Guo, Quanmin Colleges (2008 onwards) > College of Engineering & Physical Sciences School of Physics and Astronomy Q Science (General)QC Physics University of Birmingham 4681
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