Figure 7.

Single-crystalline V2O5·xH2O nanorings and microloops, and yolk-shell V2O5 microspheres. (a-h) SEM images of single-crystalline V2O5·xH2O nanorings and microloops [43]. (i-l) SEM images of yolk-shell V2O5 microspheres. The insets of (j) and (k) show the schematic structure of yolk-shell V2O5 microspheres. Adapted from [44] and reproduced with the permission of the Royal Society of Chemistry.

Liu et al. Nanoscale Research Letters 2012 7:149   doi:10.1186/1556-276X-7-149
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