Toward edges-rich MoS₂ layers via chemical liquid exfoliation triggering distinctive magnetism

Abstract

The magnetic function of layered molybdenum disulfide (MoS 2) has been investigated via simulation, but few reliable experimental results have been explored. Herein, we developed edges-rich structural MoS 2 nanosheets via liquid phase exfoliation approach, triggering exceptional ferromagnetism. The magnetic measurements revealed the clear ferromagnetic property of layered MoS 2 , compared to the pristine MoS 2 in bulk exhibiting diamagnetism. The existence of ferromagnetism mostly was attributed to the presence of grain boundaries with abundant irregular edges confirmed by the transmission electron microscopy, magnetic force microscopy and X-ray photoelectron spectroscopy, which experimentally provided reliable evidences on irregular edges-rich states engineering ferromagnetism to clarify theoretical calculation. IMPACT STATEMENT • Edges-rich MoS 2 layers are achieved via chemical liquid approach. • The abundant edges MoS 2 nanosheets demonstrate highly superior magnetic property, which provides reliable evidences to identify irregular edge states engineering ferromagnetism experimentally.

Tailoring Magnetically Active Defect Sites in MoS2 Nanosheets for Spintronics Applications

“…Even though the electronic and optical properties of MoS 2 have been explored in detail, understanding the magnetic properties of MoS 2 specifically in the nanoscale range is still very limited. While pristine bulk MoS 2 is diamagnetic in nature, recent theoretical and experimental works show ferromagnetism in MoS 2 nanostructures. − According to first-principle calculations, armchair edges are nonmagnetic and zigzag edges are magnetic in nature . The origin of ferromagnetism in MoS 2 is attributed to both zigzag edges and defects such as sulfur vacancy (V S ) present in the system.…”

Multi-orbital physics of edge-magnetism in a Hubbard model of transition-metal dichalcogenide nanoribbons: Comparing Mean Field Theory and Determinant Quantum Monte Carlo

“…Contrasting with exfoliated nanosheets, for which clear signs of ferromagnetism are observed, pristine TMDs, such as MoS 2 in its three-dimensional form, are diamagnetic [41]. Moreover, mono-/bi-layer MoS 2 nanosheets show enhanced room temperature ferromagnetism attributed to an increased density of zigzag edges and/or defects [43], while bulk monolayers are only spinvalley polarized upon doping [44].…”

“…Similarly to graphene, TMDs can also be synthesized in the form of nanoribbons, as recently demonstrated through a variety of methods [30][31][32][33][34][35]. However, contrary to graphene, there is ample experimental evidence of edge-magnetic ordering on few-layer TMD nanostructures [36][37][38][39][40][41][42][43]. In ultrathin MoS 2 and WS 2 nanosheets, ferromagnetic order sets in even at room temperature [36][37][38][39][40].…”

Strain-Modulated Magnetism in MoS2

“…Except for graphene, MoS 2 [ 17 , 18 , 19 , 20 , 21 ] has also attracted extensive attention. Interestingly, many experimental studies show that the defective MoS 2 nanostructures [ 18 , 19 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ] also exhibit FM.…”