Table 4.

Synthesis methods for silica-coated IONPs.

Synthesis Method	Advantage	Disadvantage
Stöber method	Controllable silica shell and uniform size, high crystallinity	Lack of understanding of its kinetics and mechanism
Microemulsion	Control of particle size	Poor yield, time consuming
Aeresol pyrolysis	Hermitically coated	Complex experimental condition

Adapted from [11].