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TEM images of the products from the TOP/Ni(acac)2 ratio and reaction time-dependent study under the same conditions at 215 °C: (A) 0.5, 10 min; (B) 0.5, 30 min; (C) 0.5, 120 min; (D) 2.5, 10 min; (E) 2.5, 30 min; (F) 2.5, 120 min; (G) 5.5, 10 min; (H) 5.5, 30 min; (I) 5.5, 120 min; (J) 11.0, 10 min; (K) 11.0, 30 min; and (L) 11.0, 120 min.
