Table 1.

Comparison between different synthetic pathways of MNPs.

Synthesis Method	Condition	Size Distribution	Shape Control
Co-precipitation	Simple	Relatively narrow	Poor
Sol gel	Simple	Narrow	Good
Microemulsion	Complicated	Narrow	Good
Hydrothermal	Complicated and inert atmosphere	Very narrow	Very good
Thermal decomposition	Complicated and inert atmosphere	Very narrow	Very good