File Name : fig. s1.tif

Caption : fig. s1 (a) ultra-long sno2(zno:sn)m nanowire with a tapered tip. (b) tem image of part of the superlattice nanowire with periodicity around 20 nm. (c) sn/zn-o block width distribution along the nanowire.

File Name : fig. s2.tif

Caption : fig. s2 work function of sno2(zno:sn)m and zno nanowires at different position.