Figure 4.
Temperature vs. time curves of (a) FA-PEI- Fe3O4 and (b) FA-PEI- Fe3O4@Cu2–xS at different concentrations. The temperature vs. time curves of (c) FA-PEI- Fe3O4 and (d) FA-PEI- Fe3O4@Cu2–xS for three on/off cycles.
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