“…For the horizontal direction growth, its success has been reported by many groups by using an electric field [43][44][45], a fast gas flow [46,47], and atomic steps of substrates [25,26,48,49,50,51] with other carbon sources. Furthermore, the ACCVD method has not been used for only random or VA-SWNTs, but also for horizontally-aligned SWNTs [52].…”