Review on Pure and Metal Doped Zno Nanoparticles Synthesized by Sol Gel Method: Assessment of crystallite Size and energy band Gap

Pure and metal doped ZnO nanoparticles were produced by different synthesis routes like Physical, Chemicaland Biological (Green route). There are many different synthesis methods like Co-precipitation, Sol gel,Solvothermal, Hydrothermal etc. in Chemical route. In this review, Sol gel synthesis method will be infocus. ZnO is N- type semiconductor having a wide energy band gap of nearly 3.37 eV at 300K. Variationof crystallite size and energy band gap of pure and metal doped ZnO via Sol gel synthesis method withdifferent dopant metals in different solvents were surveyed and summarised in this review. Crystallite sizeand energy band gap may be also controlled by varying heat time and temperature. This study will improveour understanding of developments in doped ZnO and will assist in the creation of new ZnO basednanomaterials with improved structural, optical and photocatalytic properties.