Abstract
Single-wall carbon nanohorns (SWNHs) with dahlia flowerlike structures were treated with H2SO4 and H2O2/H2SO4 mixture. The SWNH samples before and after acid treatment were characterized using a transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman spectroscopy, temperature-programmed desorption (TPD), and N2 adsorption at 77 K. According to TEM and SEM observation, the SWNH bundles were coalesced after H2SO4 and H2O2/H2SO4 treatments, growing up to the bundle size of several micrometers. The Raman spectra provided evidence that the H2O2/H2SO4 treatment leads to intercalation of the H2SO4 molecule into interstitial spaces of individual SWNHs as well as defect formation by oxidation reaction. The H2O2/H2SO4 treatment also altered markedly the N2 adsorption isotherms of SWNH from type II to type I, accompanied with an enhanced N2 adsorption uptake at low relative pressure due to the development of microporosity. Heat treatment at 873 K on H2O2/H2SO4-treated SWNHs additionally inc...
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