两种Fe_2O_3@rGO纳米复合物的制备及其对TKX-50热分解的影响

使用水热和溶剂热两种方法制备了还原石墨烯(rGO)负载Fe_2O_3纳米颗粒的复合物(h-Fe_2O_3@rGO和s-Fe_2O_3@rGO),并使用溶剂热法制备了未负载的rGO与Fe_2O_3纳米颗粒,通过X射线粉末衍射(XRD)、拉曼光谱(Raman)、扫描电子显微镜(SEM)等方法对制备的Fe_2O_3纳米颗粒、rGO、h-Fe_2O_3@rGO和s-Fe_2O_3@rGO进行了表征。结果表明,rGO作为基底进行负载可以有效解决Fe_2O_3纳米颗粒的团聚问题,极大地提高了其分散性。相对于水热法制备的h-Fe_2O_3@rGO,使用二甲基甲酰胺(DMF)的溶剂热法可以避免rGO基底的堆叠,进一步提高所负载的Fe_2O_3纳米颗粒分散性。用差式扫描量热法(DSC)研究了制得的h-Fe_2O_3@rGO、sFe_2O_3@rGO和Fe_2O_3纳米颗粒对1,1'-二羟基-5,5'-联四唑二羟铵盐(TKX-50)热分解性能的催化效果。结果表明Fe_2O_3纳米颗粒、rGO、h-Fe_2O_3@rGO和s-Fe_2O_3@rGO纳米复合物对TKX-50的热分解具有良好的催化活性,TKX-50的低温分解峰峰温分别降低了33.9,10.9,25.5℃和40.7℃;表观分解热分别增加至1747,1924,2096 J·g~(-1)和2983 J·g~(-1)。相对于h-Fe_2O_3@rGO和Fe_2O_3纳米颗粒,溶剂热法制备的s-Fe_2O_3@rGO纳米复合物具有更好的催化效果。

Preparation of Fe2O3@rGO Nanocomposites and Their Effect on the Thermal Decomposition of TKX-50

Nanocomposite of Fe2O3 loaded on reduced graphene oxide (rGO) was prepared using hydrothermal (h-Fe2O3@rGO) and solvothermal (s-Fe2O3@rGO) method.Moreover,rGO and Fe2O3 nanoparticles (NPs) were prepared using solvothermal method.X-ray diffraction (XRD),Raman spectra and scanning electron microscope (SEM) was used to characterize the prepared Fe2O3 NPs,rGO,h-Fe2O3@rGO and s-Fe2O3@rGO.Differential scanning calorimeter (DSC) method was used to investigate the catalytic effects of h-Fe2O3@rGO,s-Fe2O3@rGO,rGO and Fe2O3 NPs on the thermal decomposition of TKX-50.As a result,s-Fe2O3@rGO prepared by solvothermal method avoids stack of rGO and has more uniform dispersion of loaded Fe2O3 NPs.h-Fe2O3@rGO,s-Fe2O3@rGO and Fe2O3 NPs can reduce the low decomposition peak temperature by 33.9,10.9,25.5 ℃ and 40.7 ℃,respectively.The apparent decomposition heat of TKX-50 increases to 1747,1924,2096 J·g-1 and 2983 J·g-1 due to the addition of h-Fe2O3@rGO and s-Fe2O3@rGO.s-Fe2O3@rGO has better catalytic effect on thermal decomposition of TKX-50 than h-Fe2O3@rGO and Fe2O3 NPs.