Figure 3.

Schematic diagram of experimental setup for the deposition of charge to the sTNP tip. (a) Schematic diagram of experimental setup for the deposition of charge to the sTNP at the vertex of the Si3N4 AFM tip and (b) × 40 optical microscope image of the charging setup.

Chang et al. Nanoscale Research Letters 2013 8:519   doi:10.1186/1556-276X-8-519
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