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Title: Networks and Structures of Adsorbed Molecules Stabilised by Hydrogen Bonding
Author: Staniec, Paul Andrew
ISNI:       0000 0001 3477 3130
Awarding Body: University of Nottingham
Current Institution: University of Nottingham
Date of Award: 2007
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Abstract:
In this thesis, the structures formed by molecular adsorbates on the Ag/Si(lll).. J3x-.J3 R30° (Ag/Si), Au(1l1) and rutile Ti02(1l0) substrates are investigated by means of scanning tunneling microscopy (STM) and photoelectron spectroscopy (PES) in ultra-high vacuum (UHV) conditions. The majority of the work discussed involves self-assembled arrangements mediated by intermolecular hydrogen bonds. Two synchrotron investigations into the adsorption of perylene-3,4,9,1Otetracarboxylic- diimide (PTCDI) and melamine on the Ag/Si surface are presented. The formation of PTCDI and melamine unimolecular and bimolecular arrangements on the Au(1l1) surface have been investigated by STM. Both key differences and similarities have been observed with respect to a previous study on the Ag/Si surface (1. Theobald et al., Nature (2003) 424 pl029). While several intermixed structures are discussed, this study focuses on a bimolecular network which forms sizable arrays of parallelogram-shaped pores. These parallelogram arrays are shown to stabilise C60 fullerene dimers and pairs of I-decanethiol molecules. Additional size-selective stabilisation of larger fullerene clusters at network defects is also presented. Furthermore, the fullerene occupancy ofthe parallelogram networks is observed to be non-random, with an enhanced probability of occupation for nearest neighbour sites along the row direction, demonstrating that the parallelogram networks impose a hierarchy of organisation. Following this, the absorption of cyanuric acid and its intermixing with melamine on Au(111) is studied by STM. Two distinct bimolecular phases are observed, a honeycomb network and a larger chiral superstructure. The former is comparable to arrangements observed in the bulk and on the Ag/Si surface. However, the larger superstructure is, thus far, unique to the Au(lll) surface. The adsorption geometry of dye-molecules to specific substrates is a key feature in understanding of dye-sensitised solar cells. To that end, the adsorption of a dye molecule on model solar surfaces, Ti02(l1O) and Auffi02(11O), has been investigated by PES.
Supervisor: Not available Sponsor: Not available
Qualification Name: University of Nottingham, 2007 Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.489700  DOI: Not available
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