Some metal and metal oxide core–shell nanoparticles used in drug delivery.

Core	Shell	Reference
Fe	Au	70
Ag	Poly(N-isopropylacrylamide-co-acrylic acid)	80
Silver	ZnO	47
Gold	ZnO	47
Au@Ag nanorod	ZIF-8	81
ZnO–DOX	ZIF-8	82
Ag	TiO2	83
SiO2	Au	84
Au	PEG	85
Fe	N-Isopoly-acrylamide	71
Au	PEG-amino acid	86
Ag@SiO2	mTiO2	87
Ag	SiO2	88
Fe3O4	PMAA	89
Fe3O4	Au	90
Fe3O4	Chitosan	91
CaCO3@Fe3O4	PMMA	92
MnO	ssDNA	48
Au-oleic acid	N-Isoproprylacrylamide	93