Representative iron oxide nanozymes obtained through advanced hydrothermal/solvothermal procedures.

Variable/technique	Starting materials	Solvent	Particle size (nm)	Morphology	Ref.
Deep eutectic-solvothermal	Iron(iii) nitrate nonahydrate	1 : 2 : 10 choline chloride : urea : water	5–9	Oblate spheroid	51 and 60
Size-controlled facile solvothermal method	FeCl3·6H2O NaAc polyvinyl pyrrolidone (PVP)	Ethylene glycol (EG) diethylene glycol (DEG)	23	Spherical	33
Ligands and solvent composition	FeCl3·6H2O sodium carboxylate	2 : 1 water : ethanol	25	Cubic	59
Oxidation-precipitation solvothermal process	FeCl2·4H2O	Deionized water	33	Spherical	62
Microwave solvothermal treatment	FeCl3·6H2O sodium citrate	Ethylene glycol (EG)		Irregular	63
Magnetothermally-responsive nanocarriers	FeCl2·4H2O	Ethylene glycol (EG) urea	50 nm diameter, 250 nm length	Tubular shape	61