SEM images of various nanostructures obtained from sample I. (A) SEM image of the irregular nanoarchitectures accompanied by several shuttle-like nanostructures. (B) High-resolution SEM image of the shuttle-like nanostructures. (C) SEM image of a hollow nanosphere. (D) SEM image of a nanotube. The aging time is 15 min.
Guo et al. Nanoscale Research Letters 2011 6:529 doi:10.1186/1556-276X-6-529