Figure 6 .

Typical flower-like structures formed in growing process of whisker-like tungsten for different times. (a) Nanowire-like structure by holding for 3 h; (b) initial large-scale tungsten whisker-like structure by holding for 4.5 h; (c) large-scale flower-like tungsten whisker structures by holding for 6 h.

Ma et al. Nanoscale Research Letters 2012 7:325   doi:10.1186/1556-276X-7-325
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