We report here the first successful synthesis of pure Ni nanotubes by employing the electroless Ni deposition in conjunction with removable amorphous SiO_x (a-SiO_x) nanowire templates technique. After the 3-aminopropyltrimethoxysilane (APTMS) function-alization, activation, and hydrazine-modified electroless Ni plating processes, a uniform a-SiO_x/pure Ni core-shell nanowire structure is produced. By etching away the inner a-SiO_x, nanowire templates, hollow Ni nanotubes are readily obtained. The observed results present the exciting prospect that with appropriate controls, the hydrazine-modified electroless deposition combined with the APTMS-functionalized a-SiO_x nanowire templates technique can be successfully implemented in forming a variety of high-purity, hollow, metal nanotubes.
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