Table 1.

Values of the Mössbauer hyperfine parameters for maghemite (mag), maghemite/gold (mag/Au), maghemite/gold hybrid nanoparticle system layered by lipoic acid (mag/Au–HLA) and maghemite/gold nanoparticles layered by lipoic acid and functionalized by activated cisplatin (mag/Au–LA–CDDP*) derived from the fitting procedure of the respective 300-K Mössbauer spectrum. δ is the isomer shift; ΔE_Q is the quadrupole splitting; B_hf is the hyperfine magnetic field; RA is the relative spectral area of individual spectral components.

Sample	Component	δ ± 0.01 (mm/s)	ΔEQ ± 0.01 (mm/s)	Bhf ± 0.3 (T)	RA ± 1 (%)	Assignment
mag	Sextet	0.26	0.01	48.7	13	γ-Fe2O3–T-sites
	Sextet	0.35	0.00	48.2	25	γ-Fe2O3–O-sites
	Singlet	0.31	-	-	62	Fe3+ relaxation
mag/Au	Sextet	0.27	0.00	48.7	11	γ-Fe2O3–T-sites
	Sextet	0.37	0.01	48.3	20	γ-Fe2O3–O-sites
	Sextet	0.31	0.03	44.5	9	γ-Fe2O3/Au surface
	Singlet	0.31	-	-	60	Fe3+ relaxation
mag/Au–HLA	Sextet	0.25	0.01	48.6	11	γ-Fe2O3–T-sites
	Sextet	0.37	0.01	48.2	20	γ-Fe2O3–O-sites
	Sextet	0.31	0.04	44.4	9	γ-Fe2O3/Au surface
	Singlet	0.31	-	-	60	Fe3+ relaxation
mag/Au–LA–CDDP*	Sextet	0.26	0.00	48.8	11	γ-Fe2O3–T-sites
	Sextet	0.36	0.00	48.3	20	γ-Fe2O3–O-sites
	Sextet	0.32	0.04	44.3	9	γ-Fe2O3/Au surface
	Singlet	0.31	-	-	60	Fe3+ relaxation