Figure 3.

a 3D AFM image of the droplet formation upon casting of a colloidal system consisting of 0.1% concentration Ag nanoparticles dissolved in toluene and spin coated at 8,000 rpm; b AFM image shows two types of structures: plates and Ag spots surrounded by rings (e.g. enclosed by square) induced after the evaporation of toluene at 300°C for 30 min; c A cross-section profile showing ≈1.2 μm diameter droplet size. The inset shows a cross-section profile of the combined structure with ≈310 nm diameter size

Al-Harthi et al. Nanoscale Research Letters 2010 5:1737-1743   doi:10.1007/s11671-010-9703-1