Ag-TiO₂ nanofibers (three μm long, 30-150 nm thick) constituted by a single-crystalline silver wire (20-30 nm thickness) and an external layer of amorphous TiO₂ are prepared at 403 K by oxygen plasma activation of a silver substrate followed by plasma deposition of TiO₂. Thicker fibers of crystalline anatase around the silver wire were prepared when plasma deposition occurs at 523 K. The formation mechanism of these micro and nano-fibers supported on the substrate is discussed and a nobel volcano-type mechanism proposed for the formation of these composite nanofibers. The effect of plasma and the high mobility of the silver are key factors determining the formation of the fibers. Preliminary results on the formation of nanofibers of other oxides (SiO₂, ZnO) by plasma deposition are shown and their formation mechanism discussed.

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