The top panels contain the transmission electron micrographs of the studied samples Au-TPP, , , and, . The corresponding size distribution histograms are placed underneath each micrograph. The solid line in the histogram represents the fitting curve assuming that the size distribution is well reproduced by a log-normal function. The calculated mean particle diameter (Dm) and the standard deviation are included in the histograms. It must be noted that the size distribution of the sample is noticeably broader than the rest. Therefore, this histogram is best fitted with a bimodal log-normal function.
SQUID measurements from all the studied samples, top panels correspond to Au-TPP (a) (b), (c), and (d) are presented in the bottom panels. Spectra were measured at and .
EPR spectra from all studied samples, Au-TPP panel (a), panel (b), panel (c), and panel(d). Data were collected at and . A fiducial line represents the free electron g-factor.
Average size and chemical composition (weight percentage, wt %) data for the selected samples. The Fe content in all the studied samples has been found to be below the ICP sensitivity which in this case is 0.03 wt %.
Magnetic saturation for the studied samples. The values in were obtained from the experimental hysteresis curves at 300 K along with the gold concentration determined from the ICP results. The magnetization per NP has been calculated by estimating the number of gold atoms in the NP core, as previously described (Refs. 38 and 39).
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