By a News Reporter-Staff News Editor at Life Science Weekly -- Data detailed on Chalcogens have been presented. According to news reporting from Andhra Pradesh, India, by NewsRx journalists, research stated, "We study the adsorption of molecular oxygen, both singlet and triplet forms on single-walled arm chair and zig-zag carbon nanotubes (CNTs) using density functional calculations. It is found that singlet oxygen has more potential of chemisorption than the ground state oxygen on the walls of the pristine CNTs and that the adsorption behaviour is different for semiconducting and metallic nanotubes."
The news correspondents obtained a quote from the research from the Birla Institute of Technology and Science, "Molecular oxygen in its singlet state is found to adsorb strongly on semiconducting pristine nanosurfaces with appreciable binding energies and is found at bonding distances, similar to 1.47 angstrom from the side walls. Ground state oxygen is found to be only weakly physisorbed with distances in the range of 3.3-3.5 angstrom from the tube confirming the previous investigations. The effect of substitutional doping on the adsorption behaviour is studied and the adsorption is found to be enhanced with ground state oxygen coming closer at distances of similar to 1.5 angstrom, with appreciable charge transfer, on semiconducting nanotubes doped with boron, in contrast to the weak physisorption of triplet oxygen on the intrinsic tubes. This is an interesting finding, and as substitutional doping offers a permanent solution for possible use as sensor, CNTs doped with boron can find application as a potential molecular oxygen sensor. On doping the metallic nanotubes with boron, the adsorption of singlet oxygen is found to be enhanced with appreciable charge transfer compared to adsorption on the pristine form. We also find that singlet oxygen molecule dissociate near the semiconducting nanotube walls and chemically adsorb onto the surface to form a four membered dioxetane like ring."
According to the news reporters, the research concluded: "All the cases of relevant adsorption are accompanied by significant amount of charge transfer from the nanotube to the molecule."
For more information on this research see: New insights in the adsorption of oxygen molecules on single walled carbon nanotubes. Computational Materials Science, 2013;79():656-662. Computational Materials Science can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Computational Materials Science - www.elsevier.com/wps/product/cws_home/523412)
Our news journalists report that additional information may be obtained by contacting T. Vikramaditya, Birla Inst Technol & Sci, Dept. of Chem, Hyderabad 500078, Andhra Pradesh, India (see also Chalcogens).
Keywords for this news article include: Asia, India, Chalcogens, Fullerenes, Andhra Pradesh, Nanotechnology, Emerging Technologies, Single Walled Carbon Nanotubes
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