College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China.
Small. 2023 Jun;19(23):e2207325. doi: 10.1002/smll.202207325. Epub 2023 Mar 15.
2D Fe-chalcogenides have drawn significant attention due to their unique structural phases and distinct properties in exploring magnetism and superconductivity. However, it remains a significant challenge to synthesize 2D Fe-chalcogenides with specific phases in a controllable manner since Fe-chalcogenides have multiple phases. Herein, a molecular sieve-assisted strategy is reported for synthesizing ultrathin 2D iron sulfide on substrates via the chemical vapor deposition method. Using a molecular sieve and tuning growth temperatures to control the partial pressures of precursor concentrations, hexagonal FeS, tetragonal FeS, and non-stoichiometric Fe S nanoflakes can be precisely synthesized. The 2D h-FeS, t-FeS, and Fe S have high conductivities of 5.4 × 10 S m , 5.8 × 10 S m , and 1.9 × 10 S m . 2D tetragonal FeS shows a superconducting transition at 4 K. The spin reorientation at ≈30 K on the non-stoichiometric Fe S nanoflakes with ferrimagnetism up to room temperature has also been observed. The controllable synthesis of various phases of 2D iron sulfide may provide a route for synthesizing other 2D compounds with various phases.
2D 铁-硫属元素因其独特的结构相和在探索磁性和超导性方面的独特性质而引起了极大的关注。然而，由于铁-硫属元素有多种相，因此以可控的方式合成具有特定相的 2D 铁-硫属元素仍然是一个重大挑战。在此，我们通过化学气相沉积法报道了一种在基底上合成超薄二维硫化亚铁的分子筛辅助策略。通过使用分子筛并调节生长温度来控制前体浓度的分压，可以精确合成六方相 FeS、四方相 FeS 和非化学计量比的 FeS 纳米薄片。2D h-FeS、t-FeS 和 FeS 的电导率分别高达 5.4×10 S m、5.8×10 S m 和 1.9×10 S m。2D 四方相 FeS 在 4 K 时表现出超导转变。具有室温铁磁性的非化学计量比 FeS 纳米薄片在 ≈30 K 时也观察到了自旋重取向。2D 铁硫化物各相的可控合成可能为合成具有各种相的其他 2D 化合物提供了一条途径。
