Morphological, Structural, and Optical Properties of Doped/Codoped ZnO Nanocrystals Film Prepared by Spin Coating Technique and Their Gas Sensing Application

Table 3

Optical band gap and refractive index.

Sample ZnO	Technique used	Band gap (eV)	Refractive index
Sb-doped ZnO	Sol-gel	3.22	1.9962
Al- and Sb-codoped	Sol-gel	3.10	2.0199