Ferromagnetism in freestanding MoS2 nanosheets

Abstract

Freestanding MoS2 nanosheets with different sizes were prepared through a simple exfoliated method by tuning the ultrasonic time in the organic solvent. Magnetic measurement results reveal the clear room-temperature ferromagnetism for all the MoS2 nanosheets, in contrast to the pristine MoS2 in its bulk form which shows diamagnetism only. Furthermore, results indicate that the saturation magnetizations of the nanosheets increase as the size decreases. Combining the X-ray photoelectron spectroscopy, transmission electron microscopy, and electron spin resonance results, it is suggested that the observed magnetization is related to the presence of edge spins on the edges of the nanosheets. These MoS2 nanosheets may find applications in nanodevices and spintronics by controlling the edge structures.

FMR Evidence of Stable Ferromagnetic Correlations at Zigzag Edge States in Graphene

“…Magnetization of the ferromagnetically ordered spins of the monoatomic Co chains deposited on Pt substrate aligns in the easy axis direction [10]. Similarly shifted signal was observed also for the ultrasound exfoliated MoS 2 [12]. Presence of ferromagnetism in this material was conrmed by magnetization measurements.…”

Photoluminescence Enhancement Effect of the Layered MoS2 Film Grown by CVD

“…When the annealing temperature increases, the full width at half maximum (FWHM) of (002) peak increases, indicating that the grain size becomes smaller. The intensity of (002) peak is proportional to degree of bulk material [37]. At 800 ∘ C annealing temperature, the intensity of (002) peak is weakest, and the PL intensity is strongest, which shows the highest degree for film formation, which is consistent with the PL spectra in Figure 5(b).…”

Fabrication of blue luminescent MoS 2 quantum dots by wet grinding assisted co-solvent sonication

“…5(a), a very weak absorption peak can be observed at 467 cm -1 which is attributed to the Mo−S stretching vibration mode of MoS 2 . FTIR spectra of the exfoliated MoS 2 remain same as of bulk MoS 2 [44]. EDX analysis was also applied to determine the elemental composition of as synthesized MoS 2 QDs which confirms the presence of Mo and S as shown in Fig.…”

“…The gap between the frequencies of these two phonon modes depends upon the method of exfoliation, a close gap shows that monolayer structure is more prominent. Frequency of the E 1 2g mode decreases and A 1g mode increases, when number of layers of MoS 2 are increased [43,44].…”