Affiliation:
1. School of Materials Science and Engineering Shanghai University Shanghai 200444 China
2. Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 10081 China
3. School of Chemical and Environmental Engineering Anhui Polytechnic University Wuhu Anhui 241000 China
Abstract
AbstractFe‐based 2D materials exhibit rich chemical compositions and structures, which may imply many unique physical properties and promising applications. However, achieving controllable preparation of ultrathin non‐layered FeS crystal on SiO2/Si substrate remains a challenge. Herein, the influence of temperature and molecular sieves is reported on the synthesis of ultrathin FeS nanosheets with a thickness as low as 2.3 nm by molecular sieves‐assisted chemical vapor deposition (CVD). The grown FeS nanosheets exhibit a non‐layered hexagonal NiAs structure and belong to the P63/mmc space group. The inverted symmetry broken structure is confirmed by the angle‐resolved second harmonic generation (SHG) test. In particular, the 2D FeS nanosheets exhibit exceptional metallic behavior, with conductivity up to 1.63 × 106 S m−1 at 300 K for an 8 nm thick sample, which is higher than that of reported 2D metallic materials. This work provides a significant contribution to the synthesis and characterization of 2D non‐layered Fe‐based materials.
Funder
National Natural Science Foundation of China
Beijing Institute of Technology