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Room temperature UV–vis absorbance spectra of PEG–Fe3O4 with different concentrations (A); Temperature elevation of PEG–Fe3O4 as a function of time upon exposure to NIR light at 2 W·cm−2 (B); Statistical analysis of above enhanced temperature based on three independent experiments (C); Photothermal effect of PEG–Fe3O4 on viability of C6 cells with different experimental conditions (D).
