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Author(s): |
Gustavo Alexandre Viana
Total Authors: 1
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Document type: | Master's Dissertation |
Press: | Campinas, SP. |
Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Física Gleb Wataghin |
Defense date: | 2005-03-14 |
Examining board members: |
Francisco das Chagas Marques;
Sergio Gama;
Rodrigo Gribel Lacerda
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Advisor: | Francisco das Chagas Marques |
Abstract | |
In this present work, measures of Electron Paramagnetic Resonance (EPR) on amorphous carbon nitride films (a-C1-x Nx(:H)), deposited by two different techniques known as Glow Discharge (GD) and Dual Ion Beam Assisted Deposition (DIBAD), will be presenting. The parameters like Paramagnetic Centers Concentration (PCC), g value and linewidth, ordinary within the EPR spectroscopy, are analyzed as the nitrogen is incorporated promoting some structural changes into the our a-C1-x Nx(:H) samples, and besides to results reporting by others groups working in subjects close to that here developed. Differently of the behavior showed by others amorphous carbon films (a-C) deposited by several different ways, where the paramagnetic centers get rise, ~10 20cm -3 , as the optical gap drops, ~ 1.0 eV, due the presence of the largest clusters of graphite sheets, our a-C samples, mainly the ones deposited by DIBAD, presenting in a straight disagree according to this trend, as it will be later explored, with a PCC around 10 18 cm -3 and a 0 eV for the optical gap. We have attributed to this behavior, a transition between localized and itinerant centers, respectably for large and small gap, whose are the responsible for the EPR signal observed (AU) |