Synthesis and characterization of MoS₂nanosheets

Abstract

Here, we report on the synthesis of MoS2 nanosheets using a simple two-step additive-free growth technique. The as-synthesized nanosheets were characterized to determine their structure and composition, as well as their optical properties. The MoS2 nanosheets were analyzed by scanning electron microscopy, transmission electron microscopy (TEM), including high-resolution scanning TEM imaging and energy-dispersive x-ray spectroscopy, x-ray photoelectron spectroscopy (XPS), Raman spectroscopy and photoluminescence (PL). The as-produced MoS2 nanosheets are vertically aligned with curved edges and are densely populated. The TEM measurements confirmed that the nanosheets have the 2H-MoS2 crystal structure in agreement with the Raman results. The XPS results revealed the presence of high purity MoS2. Moreover, a prominent PL similar to mechanically exfoliated few and mono-layer MoS2 was observed for the as-grown nanosheets. For the thin (≤50 nm) nanosheets, the PL feature was observed at the same energy as that for a direct band-gap monolayer MoS2 (1.83 eV). Thus, the as-produced high-quality, large-area, MoS2 nanosheets could be potentially useful for various optoelectronic and catalysis applications.

Functionalization of MoS2 with 1,2-dithiolanes: toward donor-acceptor nanohybrids for energy conversion

“…5. Before functionalization, the S 2p signal shows a superposition of the conventional semiconducting MoS 2 signal, the split peak pair at 163.4 and 162.2 eV, with a second pair of peaks at 163.1 and 161.9 eV, typically associated with "vacancy" or damaged material, 55 which we associate here with the unsaturated sulfur edges. After functionalization, these additional peaks are removed as the edges all become fully sulfur saturated.…”

A study on the interaction between molybdenum disulfide and rhodamine B by spectroscopic methods

“…Therefore, individual layers can be isolated using different techniques. There are various methods to prepare single-and multi-layered MoS 2 such as mechanical exfoliation, lithium intercalation and exfoliation, liquid phase exfoliation, and chemical vapor deposition [16][17][18][19]. For the liquid phase exfoliation method, layered compounds can be directly exfoliated by sonication in suitable selected solvents like N-methyl-2-pyrrolidone (NMP) and Dimethylformamide (DMF).…”

Highly Crystalline MoS2 Thin Films Fabricated by Sulfurization

“…In Figure b, two characteristic emission peaks of Mo 3d 3/2 at 232.3 eV and Mo 3d 5/2 at 229.1 eV were observed and corresponded to binding energy of Mo 4+ state in MoS 2 . Moreover, the peak at 226.4 eV is the binding energy of a S 2s state in MoS 2 . The peaks at 232.6 and 235.7 eV indicate the presence of limited contribution of MoO 3 .…”

“…Moreover, the peak at 226.4 eV is the binding energy of a S 2s state in MoS 2 . [21] The peaks at 232.6 and 235.7 eV indicate the presence of limited contribution of MoO 3 . In Figure 3c, we observe S 2p 3/2 peak at 162.2 eV and S 2p 1/2 peak at 163.2 eV characteristics for MoS 2 and weak peaks centered at 166.2 and 168.5 eV assigned to SO 3 .…”