Quantum Size Effect in ZnO Nanoparticles via Mechanical Milling

Table 1

Characteristics of ZnO powders at various milling times.

Milling time (h)	FWHM (eV)	UV emission peak (nm)	BE emission peak (nm)	Particle size from (1) (nm)
5	0.46	309.0	414.0	2.32
10	0.51	308.5	430.0	2.24
15	0.52	306.5	418.0	2.18
20	0.54	307.0	417.5	2.10