using nanochannel Al₂O₃ as a template and a chemical vapor deposition process is reported. The outer diameters of the silicon nanotubes (SiNTs) are around 60 nm with walls approximately 10 nm thick consisting of crystalline and amorphous silicon. (D. Yang et al., September 3, Adv. Mater. 2002, 14, 1219-1221)