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HRTEM images of LMo-DWNTs [(a) and (b)] and HMo-DWNTs (c). Inset shows cross-sectional image.
(a) Adsorption (●)/desorption (○) isotherms of nitrogen at 77 K. Inset: nitrogen adsorption isotherms at low relative pressures in logarithmic scale. To allow for a better comparison, the adsorption data for LMo-DWNTs and DWNTs were offset vertically by 100 and STP , respectively. (b) , , and XPS spectra. (c) Raman spectra measured using excitation laser energy of 1.96 eV. (d) TG/DTA curves (heating rate in air). Red curves for DWNTs, blue curves for LMo-DWNTs, green curves, HMo-DWNTs, and black curves SWNTs.
Specific surface areas (SSA), porosity data and the percentages, , of micropore volumes reduced by Mo doping.
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