Pore structure and adsorption properties of single-walled carbon nanohorn bud-like aggregates treated in different atmospheres

Pore structure changes of single-walled carbon nanohorns (SWNHs) after oxidation with O-2 and CO2 at different temperatures were studied. Low-temperature N-2 adsorption isotherms were analyzed to evaluate the parameters of both types of porosities present: interparticle pores and intraparticle cavities. Bud-SWNHs, produced by laser ablation of carbon in He atmosphere, have completely closed intraparticles. Oxidation in O-2 at 693 K opens 77% of the closed nanohorns. (C) 2002 Elsevier Science B.V. All rights reserved.