Figure 4.

a Schematic of a cross-section of a Ni plaque, containing perforated Ni foil (thickness 0.1 mm) and sintered Ni particles (1–3 μm) and b, c SEM images of the surface of a Ni plaque at different magnifications

Li et al. Nanoscale Research Letters 2010 5:512-517   doi:10.1007/s11671-009-9518-0