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Étude théorique des nanotubes de TiO2 et de leurs interactions avec les gaz

Étude théorique des nanotubes de TiO2 et de leurs interactions avec les gaz

Gustavo Olinto da Silva

68,72 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2024
Materia
Química física
ISBN:
9786208286903
68,72 €
IVA incluido
Disponible

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L’étude théorique des nanotubes de dioxyde de titane a utilisé une méthodologie de création de modèles de nanotubes à partir des cellules unitaires de cristaux de TiO2 (rutile et anatase) dans des plans spécifiques, en l’occurrence l’anatase dans le plan (101) et le rutile dans le plan (110). Les structures générées ont été soumises à des calculs de mécanique quantique en utilisant des méthodes semi-empiriques (PM7) et des méthodes ab-initio DFT et HF dans les bases 6-31G et 6-311G. Des modèles ont été créés et il a été constaté que les structures les plus stables étaient celles ayant les plus grands diamètres. Une comparaison entre des modèles ayant le même nombre d’atomes a montré que les nanotubes d’anatase étaient plus stables que les nanotubes de rutile. Lors de l’évaluation du gap à l’aide de méthodes semi-empiriques et HF, les nanotubes d’anatase ont été classés comme isolants en raison de la plage de gap comprise entre 6,00 eV et 10,00 eV, tandis que les valeurs DFT ont montré des valeurs comprises entre 2,00 eV et 2,50 eV. La méthodologie développée a montré un fort potentiel d’application dans la simulation des nanotubes de TiO2.

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