Figure 3

(a) Schematic of removing Cu matrix using 20 vol.% H₂SO₄ solution. (b) TEM image of Cr carbide nanostructure grown on MWCNTs observed after removing Cu matrix using 20 vol.% H₂SO₄ solution. (c) Possible schematic of carbide growth on MWCNTs by reaction of diffused Cr atoms and amorphous carbons on MWCNT.