石墨烯量子点自组装制备硅基亚稳态分子间复合物及其放热性能研究

Effect of graphene quantum dots on the heat release of self-assembled Si/Fe2O3 metastable intermolecular composites

亚稳态分子间复合物因其具有较高的能量密度在军事与民用领域受到广泛应用.本文作者利用石墨烯量子点(graphene quantum dots,GQDs)作为自组装媒介制备Si/GQDs/Fe2O3纳米复合物,并研究了所制备复合物的形貌与放热性能,同时讨论了不同分散剂对所制备的复合物形貌与放热量的影响.结果显示,以水/异丙醇混合物作为分散剂并通过GQDs自组装制备的亚稳态分子间复合物放热量达到 1 817.5 J/g.对比发现Si与Fe2O3纳米颗粒在水/异丙醇混合物中良好的分散性与二者表面通过GQDs构建的紧密接触是实现放热量提高的主要原因.

Metastable intermolecular composites (MICs) with high energy release hold great promises in both military and civilian applications.Herein,graphene quantum dots (GQDs) were employed as the media for assembling Si/GQDs/Fe2O3 MICs and the heat performance of the as-obtained MICs was studied.Additionally,the effects of dispersant on the morphology and heat release of MICs were also discussed.The results demonstrated the optimized heat release of 1 817.5 J/g,owing to the better dispersity of Si and Fe2O3 in water/IPA mixture and the intimate surface contact bridged by GQDs.