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The Nitrogen adsorption¨Cdesorption isotherm of the ordered MCNAs exhibits type IV characteristics (Fig. 3), which is indicative of the presence of relatively large pores in the sample. The BET surface area and total pore volume of the ordered MCNAs are 960 m2 g−1 and 1.598 cm3 g−1, respectively. The mesopore size distribution shown in Fig. 3 (inset) indicates that the mesopore sizes of the ordered MCNAs are dominantly distributed between 3.0 nm and 5.0 nm with a peak value at ~ 3.9 nm. The average pore diameter determined by BJH method is 8.8 nm.


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Nevertheless, the characterization of the mesoporous structure of carbon nanofiber arrays is still not convincing. The author described that the mesopores of ordered MCNAs are mainly centered at ~3.9 nm (page 5, line 56). However, the nitrogen adsorption curve (Figure 3) indicates the presence of mesopores with broad size distribution (a sharp capillary condensation step does not appear). TEM images (Figure 2C) does not give clear evidence for the uniform mesopores, either. In my opinion, sharp pore size distribution presented in inset of Figure 3 might be calculated from a desorption curve. The author should surely confirm whether the pore size distribution was derived by using the adsorption isotherm.

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