▎ 摘　　要

The in-situ growth method were used to produce the [Fe(Htrz)(2)(trz)](BF4)-GO nanocomposites due to the abundant oxygen functional groups on the surface of the GO templates. The [Fe (Htrz)(2) (trz)] (BF4)-GO nanocomposites have been characterized by PXRD, FTIR, SEM, TEM, Raman spectra. The peaks of FTIR and PXRD patterns of the nanocomposites are nearly the superposition of the spectra of individual GO and [Fe(Htrz)(2)(trz)](BF4), demonstrating the successful formation of spin crossover-graphene oxide nanocomposites. SEM and TEM analysis intuitively shows the cubic [Fe(Htrz)(2)(trz)](BF4) nanoparticles uniformly anchored on the surface of GO. Additionally, with the assembly time increasing, the quantity and size of [Fe(Htrz)(2)(trz)](BF4) on the surface of the GO increase gradually. Raman spectra indicates that the intensity ratio of the D to G band (I-D/I-G) increases after the [Fe (Htrz)(2)(trz)](BF4) loaded onto the surface of GO, which reveals that the defects in GO materials structures increase, and the interaction between [Fe(Htrz)(2)(trz)](BF4) nanoparticles and GO strengthens. Magnetic measurement manifests the transition temperatures of SCO-GO nanocomposites with different assembly time (1, 6, 12 h) are 381.1, 381.5 and 382.4 K in warming, 345.9, 345.0 and 344.8 K in cooling with the hysteresis width of 35.2, 36.5 and 37.6 K, respectively. This is attributed to the variation in the capacity and size of [Fe(Htrz)(2)(trz)] (BF4) in SCO-GO nanocomposites with different assembly time. The result of DSC analysis is consistent with the magnetic result, confirming that the spin transition temperatures of SCO-GO nanocomposites move to high temperature.