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Adsorption of CO, CO2, NO and NO2 on Carbon Boron Nitride Hetero Junction: DFT Study

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DOI: 10.4236/jsemat.2015.54019    3,906 Downloads   4,513 Views   Citations

ABSTRACT

The adsorption of CO, CO2, NO and CO2 gas molecules on different diameters and chiralities of carbon nanotube-boron nitride nanotube (CNT-BNNT) heterojunctions is investigated, applying the density functional theory and using basis set 6 - 31 g (d,p). The energetic, electronic properties and surface reactivity have been discussed. We found that the best CNT-BNNT heterojunctions for adsorbing the CO, NO, CO2 and NO2 gas molecules is (5,0) CNT-BNNT heterojunction through forming C-N bonds with adsorption energy of -0.26, -0.41 eV, -0.33 and -0.63 eV, respectively. Also, the adsorption of CO, NO, CO2 and NO2 gas molecules on (5,5) and (6,6) CNT-BNNT heterojunctions does not affect the electronic character of the CNT-BNNT heterojunctions, however the adsorption of NO and NO2 gas molecules on (5,0) and (9,0)CNT-BNNT heterojunctions in case of forming C-B bonds increases the band gaps to 1.21 eV and 1.52 eV, respectively. In addition, it is reported that the values of dipole moment for armchair (5,5) and (6,6) CNT-BNNT heterojunctions are not affected by gas adsorption. Also, for the zig-zag (5,0) and (9,0) CNT-BNNT heterojunctions, the values of dipole moment increase through forming C-N bonds and decrease through forming C-B bonds. In addition, it is reported that the highest dipole moment is obtained for (9,0) CNT-BNNT heterojunctions. Therefore, the zig-zag CNT-BNNT heterojunctions can be selected as good candidate for gas sensors.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

El-Barbary, A. , Eid, K. , Kamel, M. , Taha, H. and Ismail, G. (2015) Adsorption of CO, CO2, NO and NO2 on Carbon Boron Nitride Hetero Junction: DFT Study. Journal of Surface Engineered Materials and Advanced Technology, 5, 169-176. doi: 10.4236/jsemat.2015.54019.

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