Our MWCNTs are manufactured by catalytic chemical vapor deposition (CVD) method and functionalized using concentrated acid chemistry. Carboxyl, hydroxyl and amine functionalized MWCNTs are available with both regular and short-length MWCNTs. We also develop kinds of special MWCNTs including N-doped, helical, large-inner thin-walled, aligned, Ni coated, as well as carbon nanofibers