磁电阻
二次方程
理论(学习稳定性)
材料科学
纳米技术
凝聚态物理
化学物理
化学工程
数学
铁磁性
计算机科学
工程类
物理
几何学
量子力学
磁场
机器学习
作者
Peng Wang,Yao Wen,Xiaoxu Zhao,Baoxing Zhai,Ruofan Du,Mo Cheng,Zheng Liu,Jun He,Jianping Shi
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-04-25
卷期号:16 (5): 8301-8308
被引量:14
标识
DOI:10.1021/acsnano.2c02267
摘要
Two-dimensional (2D) iron chalcogenides (FeX, X = S, Se, Te) are emerging as an appealing class of materials for a wide range of research topics, including electronics, spintronics, and catalysis. However, the controlled syntheses and intrinsic property explorations of such fascinating materials still remain daunting challenges, especially for 2D nonlayered Fe7S8 with mixed-valence states and high conductivity. Herein, we design a general and temperature-mediated chemical vapor deposition (CVD) approach to synthesize ultrathin and large-domain Fe7S8 nanosheets on mica substrates, with the thickness down to ∼4.4 nm (2 unit-cell). Significantly, we uncover a quadratic-dependent unsaturated magnetoresistance (MR) with out-of-plane anisotropy in 2D Fe7S8, thanks to its ultrahigh crystalline quality and high conductivity (∼2.7 × 105 S m-1 at room temperature and ∼1.7 × 106 S m-1 at 2 K). More interestingly, the CVD-synthesized 2D Fe7S8 nanosheets maintain robust environmental stability for more than 8 months. These results hereby lay solid foundations for synthesizing 2D nonlayered iron chalcogenides with mixed-valence states and exploring fascinating quantum phenomena.
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