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Synthetic condition of (a) NPs concentration (0.1 g PVP, t=14 h, T=200°C). (b) PVP optimization (IO NPs: 0.5 mg/mL, t: 14 h, T: 200°C). (c) reaction time (IO NPs: 0.5 mg/mL, PVP: 0.25 g, T: 200°C). (d) temperature (IO NPs concentration: 0.5 mg/mL, PVP: 0.25 g, t: 12 h). (e) hydrothermal capacity (t: 12 h, T: 200°C).
