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SEM images of the obtained composite film from the TiCl4/PS/CHCl3 solution with different concentrations of TiCl4: (a) 0.3% v/v; and (b) 0.4% v/v (PS, 1 wt %, relative humidity, 30%). Insets in (a) and (b) are the magnified mushroom-like particles, respectively. Scale bar = 0.5 μm [93].
