Figure 3.

Composition characterizations of Nb2O5 nanotube products: XRD (a) and EDX (b) patterns of single-crystalline nanoporous Nb2O5 nanotubes. All the peaks in Figure 3a totally overlap with those of pure Nb2O5 (compare reference lines, JCPDS no. 30-0873) and no evidence of any impurity was detected.

Liu et al. Nanoscale Research Letters 2011 6:138   doi:10.1186/1556-276X-6-138
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