Optical and Structural Properties of ZnO Nanoparticles Synthesized by CO₂ Microwave Plasma at Atmospheric Pressure

Figure 4

(a)–(c) are the FE-SEM images corresponding to the sample A–C in Figure 2(c), respectively. (d) is the FE-SEM image of a commercial ZnO.

(a)

(b)

(c)

(d)