Molecular design of O3 and NO2 sensor devices based on a novel heterostructured N-doped TiO2/ZnO nanocomposite: a van der Waals corrected DFT study
Abstract
Abstract
We have presented a density functional theory study of the adsorption properties of NO
2
and O
3
molecules on heterostructured TiO
2
/ZnO nanocomposites. The most stable adsorption configurations, adsorption energies and charge transfers were calculated. The electronic properties of the complex TiO
2
/ZnO heterostructures were described using the density of states and molecular orbital analyses. For NO
2
adsorption, it was found that the oxygen atoms preferentially move towards the fivefold coordinated titanium atoms, whereas the nitrogen atom binds to the zinc atom. In the case of O
3
adsorption, the side oxygen atoms bind to the fivefold coordinated titanium sites, and the central oxygen atom does not contribute to the adsorption any longer. Thus, the interaction of NO
2
and O
3
molecules with TiO
2
side of nanocomposite is strongly favored. On the N-doped TiO
2
/ZnO nanocomposites, the adsorption process is more energetically favorable than that on the pristine ones. The N-doped nanocomposites are far more sensitive to gas detection than the undoped ones. In TiO
2
/ZnO nanocomposites, the interactions of gas molecule and TiO
2
are stronger than those between gas molecule and bare TiO
2
nanoparticles, which reveals that ZnO is conducive to the interaction of NO
2
and O
3
molecules with TiO
2
nanoparticles. Our theoretical results suggest multicomponent TiO
2
/ZnO nanocomposite as a potential material for gas sensing application.
Graphical Abstract
Keywords
- Interaction,
- Density functional theory,
- PDOS,
- NO2,
- O3,
- TiO2/ZnO nanocomposite
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