The successful synthesis of monoclinic Nb2O5 nanotube arrays (see figure) from pseudo-hexagonal Nb2O5 nanorod arrays is reported; the synthesis is based on phase transformation accompanied by void formation, where voids can be intriguingly generated during phase transformation. A key parameter for achieving nanotube growth is the energy difference between the pseudo-hexagonal and monoclinic Nb2O5 nanostructures, which determines the phase transformation.
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Yan et al. (2008) studied this question.
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