Figure 2.

Schematic diagrams of two possible NR self-attraction models. (a) The tips of two NRs touch each other, (b) two NRs touch each other at the crossed position. Insets are top-view images of sample S4.

Lin et al. Nanoscale Research Letters 2013 8:158   doi:10.1186/1556-276X-8-158
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