Table 1.

Comparison between preselected manufacturing processes ([23,24,25,26]).

Manufacturing Method	Synthesis	Reaction Temp. (°C)	Reaction time	Solvent	Surface-Capping Agents	Size Distribution	Shape Control	Yield
Co-precipitation	Very simple	20–90	Minutes	Water	During/after reaction	Relatively narrow	Not good	High
Microemulsion	Complicated	20–50	Hours	Organic agents	During reaction	Relatively narrow	Good	Low
Thermal decomposition	Complicated	100–320	Hours-days	Organic agents	During reaction	Very narrow	Very good	High
Hydrothermal	Simple	200–250	Hours-days	Water-ethanol	During reaction	Very narrow	Very good	Medium