Preparation of self-assembled FOX-7 nanosheets and their performance

Abstract

Using an energetic additive (EA) with a layered network structure as a crystallization inducer, 1,1-diamino-2,2-dinitroethylene (FOX-7) nanosheets were prepared by a solvent–non-solvent method. Their morphology, phase, structure and thermal performance were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FT-IR), and differential scanning calorimetry (DSC). The impact sensitivity of the sample was determined. The results show that EA has a significant effect on the morphology of the prepared FOX-7. After the addition of EA, the morphology of FOX-7 changed from a blocky shape to hexagonal nanosheets, and a self-assembled FOX-7 nanosheet structure was formed. EA's inducing and restricting effects on the growth of the FOX-7 crystal eventually led to the formation of FOX-7 nanosheets. The prepared FOX-7 nanosheets using 5 wt% EA have the thinnest thickness of 50–100 nm. As the addition amount of EA increases, the decomposition temperatures of the prepared FOX-7 nanosheets decrease, and their apparent thermal decomposition enthalpy increases. The impact sensitivities of the prepared FOX-7 nanosheets increase after the addition of EA, and the FOX-7 nanosheets prepared using 5 wt% EA show the lowest impact sensitivity. This study provides a novel way to prepare explosive nanosheets by using a material with the same morphology as an additive.