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Comparative Study on Gas Adsorption in Defected Carbon and Boron Nitride Nanotube

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Investigations on gas adsorption in nanostructures are important for potential applications such as fuel cell, gas sensor, hydrogen storage etc. Of all nanomaterials, carbon (CNTs) and boron nitride nanotubes (BNNTs) are analyzed widely, since they are porous, having large surface area and high thermal stability. It is interesting to note that while CNTs exhibit both semiconducting and metallic behaviour, BNNTs show only semiconducting nature. Factors like topological defects, doping and functionalization are observed to enhance the effect of adsorption in these nanotubes. We have considered physisorption of H2, N2 and O2 in armchair (5,5) nanotubes of both carbon and boron nitride and estimated the binding energies through simulation. To study the role of defects, we have introduced a combination of an octagon and a pair of pentagon (5-8-5) called divacancy defect in the hexagonal structure and calculated adsorption binding energy (Eads) of gas molecules at the defected site. We could observe 59.72% increment in Eads in defected CNTs and 122.7% enhancement in defected BNNTs compared to defect-free tubes for hydrogen. With nitrogen molecule as adsorbate, we found 58.49% and 84.13% increase in Eads in defected CNTs and BNNTs respectively. The results lead to the conclusion that defects plays a vital role on physisorption in both carbon and boron nitride nanotubes.

Keywords: Carbon nanotubes; binding energy; boron nitride nanotubes; defect; gas adsorption

Document Type: Research Article


Publication date: April 1, 2010

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  • Current Nanoscience publishes authoritative reviews and original research reports, written by experts in the field on all the most recent advances in nanoscience and nanotechnology. All aspects of the field are represented including nano- structures, synthesis, properties, assembly and devices. Applications of nanoscience in biotechnology, medicine, pharmaceuticals, physics, material science and electronics are also covered. The journal is essential to all involved in nanoscience and its applied areas.

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