Left-handed,coiled,4,4'-biphenylene bridged polybissilsesquioxane,tubular nanoribbons were prepared according to the published literature.After carbonization and removal of silica using HF aqueous solution,left-handed,coiled,carbonaceous,tubular nanoribbons were obtained.The lefthanded,coiled,carbonaceous,tubular nanoribbons were characterized using field-emission scanning electron microscopy,transmission electron microscopy,powder X-ray diffraction,Raman spectrophotometer,diffuse reflectance circular dichroism(DRCD),and N_2 adsorptions.Micropores were formed due to the removal of silica.The nitrogen BET surface area is 1727 m^2/g.A broad,positive DRCD signal,identified at 400-800 nm,indicates the carbonaceous,tubular nanoribbons exhibit optical activity.The helical pitch is proposed to play an important role in the position of the DRCD signal.
