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Title: BCN: A Graphene Analogue with Remarkable Adsorptive Properties
Authors: Raidongia, Kalyan
Nag, Angshuman
Hembram, K P S S
Waghmare, Umesh V
Datta, Ranjan
Rao, C N R
Keywords: adsorption
materials science
Bxcynz Nanotubes
Issue Date: 2010
Publisher: Wiley-VCH Verlag GmbH
Citation: Chemistry-A European Journal 16(1), 149-157 (2010)
Abstract: A new analogue of graphene containing boron, carbon and nitrogen (BCN) has been obtained by the reaction of high-surface-area activated charcoal with a mixture of boric acid and urea at 900 degrees C. X-ray photoelectron spectroscopy and electron energy-loss spectroscopy reveal the composition to be close to BCN. The X-ray diffraction pattern, high-resolution electron microscopy images and Raman spectrum indicate the presence of graphite-type layers with low sheet-to-sheet registry. Atomic force microscopy reveals the sample to consist of two to three layers of BCN, as in a few-layer graphene. BCN exhibits more electrical resistivity than graphene, but weaker magnetic features. BCN exhibits a surface area of 2911 m(2)g(-1), which is the highest value known for a BxCyNz composition. It exhibits high propensity for adsorbing CO2 (approximate to 100 wt %) at 195 K and a hydrogen uptake of 2.6 wt % at 77 K. A first-principles pseudopotential-based DFT study shows the stable structure to consist of BN3 and NB3 motifs. The calculations also suggest the strongest CO2 adsorption to occur with a binding energy of 3.7 kJ mol(-1) compared with 2.0 kJ mol(-1) on graphene.
Description: Restricted Access
Other Identifiers: 0947-6539
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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