Figure 4.

SEM images of single nanotips formed at a repetition rate of 12 MHz and dwell times(a)2 ms and flower-like nanotips at dwell times of(b)5 ms and(c)10 ms.

Samarasekera et al. Nanoscale Research Letters 2012 7:404   doi:10.1186/1556-276X-7-404
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