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Sangita Kumari,Rashi Gusain,Niranjan Kumar,Om P. Khatri 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.42 No.-
Lamellar-structured nanomaterials are gaining large interest for tribological applications owing to theirremarkable mechanical and low shearing properties. Herein, polyethylene glycol (PEG)-mediatedhierarchical microspheres of MoS2 nanosheets are synthesized by a facile and single-step hydrothermalreduction of ammonium molybdate in the presence of thiourea. The PEG functions as a soft templatingmaterial and provides hierarchical microspheres of MoS2 nanosheets. Detailed chemical andmicrostructural features of hierarchical microspheres of MoS2 nanosheets are probed by FTIR[14TD$DIF], XPS,Raman, XRD, TGA, FESEM, and HRTEM analyses. Each nanosheet of MoS2 [15TD$DIF]microspheres is composed oflimited number (10–20) of atomic-thick lamellae[3TD$DIF] as deduced from HRTEM images. The MoS2microspheres, as[4TD$DIF] additive[5TD$DIF] provide significantly improved lubrication properties for steel tribo-pair byreducing the friction ( 21%) and the wear (42%) compared to that of fully formulated 10W40 lubricant. The elemental mapping of worn surfaces revealed the deposition of MoS2 nanosheets on the contactinterfaces. The improved lubrication properties are attributed to collective effect of deposition ofdelaminated MoS2 lamellae on the contact interfaces, low shearing and high mechanical strength ofMoS2 nanosheets.