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Citation link: http://nbn-resolving.de/urn:nbn:de:gbv:46-00101981-17
00101981-1.pdf
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Computational Studies on Functionalized ZnO Surfaces and Nanostructures


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Other Titles: Computer-Simulation von funktionalisierten ZnO Oberflächen und Nanostrukturen
Authors: Moreira, Ney Henrique 
Supervisor: Frauenheim, Thomas 
1. Expert: Frauenheim, Thomas 
2. Expert: Mädler, Lutz 
Abstract: 
In this work, we have used computer simulations to investigate the effect of organic functionalization on ZnO surfaces and nanostructures. Density Functional Theory has been employed to study the interactions of ZnO surfaces with different organic groups, identifying stabilization mechanisms involved in each case and the most promising anchoring groups for ZnO functionalization. Additionally, a semi-empirical model for ZnO large scale simulations has been developed and validated by comparison against DFT calculations. The was successful in simulating Zn-containing bulk solids and molecular complexes, ZnO surfaces and nanostructures, and the adsorption of organic acids on (1010)-ZnO surfaces. We have also employed this model to characterize native defects in ZnO nanowires. Finally, we have demonstrated that the interaction of surface oxygen vacancies with organic acids may explain the suppression of photoluminescence anomalies observed for polymer coated ZnO nanowires.
Keywords: ZnO, Functionalization, Nanostructures, Surface Chemistry, DFT, SCC-DFTB
Issue Date: 11-Apr-2011
Type: Dissertation
URN: urn:nbn:de:gbv:46-00101981-17
Institution: Universität Bremen 
Faculty: FB1 Physik/Elektrotechnik 
Appears in Collections:Dissertationen

  

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