Biswal, Arijit2026-10-072026-10-072022-05-18http://nits.ndl.gov.in/handle/123456789/156Due to some truly amazing properties of two-dimensional layered materials such as high surface volume ratio, quantum confinement of electrons in two dimensions, and advantage in band-gap designing due to the variable energy bandgap with layer thickness, they are very promising in the field of nanoelectronics. However, employing various exfoliation processes, it is also tough to accomplish monolayer or few-layer nanosheets (2-D) of such valuable material. Re-stacking of layers owing to Van der Waal's contact may reduce the stability of these kinds of two-dimensional nanosheets even after exfoliation. In this paper, we describe how to successfully exfoliate MoS2 into few-layer nanosheets using a probe sonication technique that is very persistent for months with no restacking. The yield of MoS2 nanosheets is 13.74 mg/ 10 ml DMF (the exfoliating medium). The production of 2-D MoS2 nanosheets is confirmed by SEM images. The XRD of exfoliated MoS2 sample provides information on the crystallite size and layer count. The crystallite size was calculated to be ~12 nm, and the nanosheet thickness is roughly 18-20 layers of Mos2. The increment of both UV-Visible absorbance peak (A, B, C, D) and PL intensity in the context of UV Ozone treatment gives an approximate notion of the incorporation of oxygen in the S-vacancy sites of MoS2. The I-V curve clearly illustrates the photoconductive essence of MoS2 nanosheets, whereas the increase in dark current and photocurrent of UV Ozone treated specimens confirmed that the embedded oxygen not only deactivates the S-vacancy sites of exfoliated MoS2 nanosheets but also acts as P-type dopants, generating P-type charge carriers. The results of this work show that UV Ozone treated exfoliated MoS2 thin films hold a lot of promises in the field of optoelectronics.en