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Schlagwörter:
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Zusammenfassung:
Ni-catalyzed single-crystal TiO2 nanowire growth was observed to occur well below the bulk Ni melting
point when a small amount of P was present. TEM, SAED, EDXS, and EELS analyses as well as consideration
of the Ni/P phase diagram point to a previously unreported mechanism of nanowire growth catalyzed by a
liquid Ni/P eutectic shell surrounding a solid Ni core. High-resolution elemental analysis supports the conclusion
that the active catalyst is the outer liquid Ni/P layer with P present at a 3-8% level surrounding a solid Ni
core. Growth proceeds by precursor adsorption onto the liquid layer followed by diffusion to the growing
surface of the nanowire. This catalyst system produces rutile TiO2 nanowires efficiently. We believe that the
technique is generalizable to other metal/dopant systems which could lead to the synthesis of other hard-tosynthesize
nanowires.
