Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614398
Title: Fluorinated benzylphosphonic acid derivatives for work function modification
Author: Abraham, Ffion
ISNI:       0000 0004 5366 2948
Awarding Body: Durham University
Current Institution: Durham University
Date of Award: 2014
Availability of Full Text:
Access through EThOS:
Access through Institution:
Abstract:
Methodology for the synthesis of polyfluorinated biphenyl benzylphosphonic acids was developed and various highly fluorinated phosphonic acid derivatives may be synthesised from the corresponding fluorobenzene system. Synthesis of analogous benzylphosphonic acids from corresponding benzyl bromides is also described. The use of these systems as self-assembled monolayers on AlOx was assessed by a range of surface-sensitive analytical techniques. The surface energy and work function of aluminium oxide (AlOx) may be altered upon the adsorption of monolayers formed of partially fluorinated benzylphosphonic acids. Replacement of surface hydroxyl groups by hydro- and fluorocarbon modifiers significantly lowers the surface energy of AlOx, increasing its compatibility with suitable organic layers for applications such as organic light emitting diodes (OLEDs) and organic thin film transistors (OTFTs). Fluorinated self-assembled monolayers can alter the work function of AlOx by inducing a surface dipole upon adsorption. Depending on the nature of the dipole, the work function can either be increased or decreased over a total range of 0.91 eV. In addition, the synthesis of related, highly polar, piperazine based biaryl benzylphosphonic acids, and their biphenyl counterparts, is described.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.614398  DOI: Not available
Share: