Table 3.

Features of the three spray pyrolysis methods and how they can be used to make different nanostructures.

SP Techniques	Advantages	Disadvantages	Nano-Structures	Ref.
Spray Pyrolysis	•Continuous Process •Robust scalability •One-spot synthesis •High Efficiency •Low cost	•Low tap density •Low crystallinity	•Hollow, porous, plicated, dense spheres •Nanoplates •Core-shell	[[109], [110], [111]]
Spray Pyrolysis Deposition	•Low Production Cost •Low investment •High Efficiency •No vacuum	•Low crystallinity •Low accuracy	•Nanorods, nanowires, nanotubes •Thin films •Nanocomposite	[[112], [113], [114]]
Flame Spray Pyrolysis	•Uniform Composition •Continuous process •High temperature •High crystallinity	•Low controllability •Low consistency	•Ultra-fine nanoparticles •Nanocomposites	[112,113]