Chemical conversion synthesis of magnetic Fe1−xCox alloy nanosheets with controlled composition

Abstract

Chemical conversion provides a versatile platform for the synthesis of advanced nanomaterials with targeted phase, composition, and architecture. Here, we report a trioctylphosphine (TOP)-driven chemical conversion route to transform lamellar Fe_1−xCo_xS_1.2–DETA (x = 0.1, 0.3, 0.5, 0.7, DETA = diethylenetriamine) inorganic–organic hybrid solid solutions into two-dimensional (2D) single-crystal Fe_1−xCo_x alloy with controllable composition and dimensionality. Synergetic transformation coupled with DETA removal and sulfur extraction of lamellar Fe_0.9Co_0.1S_1.2–DETA hybrids was examined in detail. The highest magnetization of 175 emu g⁻¹ was recorded for the prepared Fe_0.7Co_0.3. Our results not only provide a new lamellar inorganic–organic hybrid solid solution but also extend the chemical conversion strategy to the synthesis of previously unavailable magnetic alloy nanosheets.