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Field emission of ZnO nano-structures produced by laser ablation

McLoughlin, Conor (2010) Field emission of ZnO nano-structures produced by laser ablation. PhD thesis, Dublin City University.

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Abstract

The thesis describes the development of, and results from, two new laboratory facilities designed to investigate the properties of laser produced plasmas, with in-situ time of flight mass spectrometry, for deposition of ZnO materials for applications as field electron emission sources. The results from the work are concerned with the study of the important physical processes present in a laser ablation zinc oxide plasma plume expanding into vacuum and various ambient gas pressures. The thesis also demonstrated the advantages of combining a linear ToF detector and a mass resolved ReToF spectrometer for clarification of ionisation processes in the pulsed laser ablation regime of solid targets. The outstanding results show that during the ablation process, ZnO atomises into Zn and O. In the vacuum regime we have shown that at long distances from the target multiple charged states of Zn and O are present. While under the same conditions in an ambient gas the multiple charged states are not present, however the ambient gas undergoes an ionisation process. Deposited materials are tested for applications as field electron emission sources, for analysis of field enhancement factors from nano-material ZnO.

Item Type:Thesis (PhD)
Date of Award:March 2010
Refereed:No
Supervisor(s):Mosnier, Jean-Paul
Uncontrolled Keywords:nanostructures;
Subjects:Physical Sciences > Laser plasmas
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
ID Code:15111
Deposited On:31 Mar 2010 15:54 by Jean-Paul Mosnier. Last Modified 31 Mar 2010 15:54

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