ICP-OES measurement of metal ions leached out of the layered PMC and non-layered PMC.

Metal nanoparticles	Layered		Non-layered
	w/o SNAP (μg g−1)	SNAP (μg g−1)	w/o SNAP (μg g−1)	SNAP (μg g−1)
Ag	<0.12	<0.12	<0.30	0.79
Fe	<4.74	<4.74	<0.96	<0.95
Cu	0.18	0.11	<0.25	16.7
Zn	<0.42	<0.42	0.69	21.0
Ni	<0.44	<0.44	1.36	12.0