Covalently Bonded 2D/0D g‐C₃N₄/MoS₂ Nanocomposites for Enhanced Tribological Properties in Oil

Abstract

In current work, by an ordinary one‐step hydrothermal strategy, the covalently bonded graphitic carbon nitride/molybdenum disulfide (g‐C3N4/MoS2) nanocomposites were successfully synthesized. SEM, TEM analyses evidenced the well distribution of MoS2 nanoparticles on g‐C3N4. The covalent bond (C−S bond) between two‐dimensional (2D) g‐C3N4 and zero‐dimensional (0D) MoS2 were confirmed by FTIR and XRD. Furthermore, the average friction coefficient and wear rate of g‐C3N4/MoS2 nanocomposites at 0.20 wt % concentration could separately reach up to 27.86 % and 70.87 % reduction by comparing pure oil, benefiting from synergistic lubrication of g‐C3N4 nanosheets plus spherical MoS2. In the work, novel guidance will be provided for the potential application of multi‐dimensional g‐C3N4‐based nanocomposites in lubricating field.

Photoelectrochemical Water Separation and Dye Degradation Catalyzed by g-C3N4/MoS2 Nanosheets Doped with V2+ Metal Ions Coated on TiO2 Nanorods

“…The material shows the E 2g and A 1g modes at 379 and 402 cm –1 , respectively; this might be because of first-order Raman modes of vibration modes inside the S–Mo–S layer . However, the E 1g mode that is around 281 cm –1 (Figure e,f) is Raman active in bulk 2H MS due to its location at the point in the hexagonal Brillouin zone; backscattering measurements on a surface upright to the c -axis exclude this mode . This shows that the MoS 2 layers are not vertical to the laser but are orientated irregularly with no polarized effect.…”

“…17 However, the E 1g mode that is around 281 cm −1 (Figure 2e,f) is Raman active in bulk 2H MS due to its location at the point in the hexagonal Brillouin zone; backscattering measurements on a surface upright to the c-axis exclude this mode. 25 This shows that the MoS 2 layers are not vertical to the laser but are orientated irregularly with no polarized effect.…”

“…21-1272) are indexed as (101), (211), and (002), as shown in Figure 2b. 13,25 One further peak, corresponding to the (003) planes, becomes increasingly apparent as the fraction of V 2+ in the composites increases. This extends the g-CN's van der Waals gap into the host MoS 2 crystal and increases the interplanar distance.…”

“…This has possibly led to the formation of a 2D hybridized nanoheterostructure that improved the photoelectrocatalytic activity of catalysts by moving the charge carriers generated by sunlight. 25,26 Supporting Information, Figure S1 displays the SEM microstructures of TiO 2 nanorods with various magnifications. It unequivocally demonstrates that the produced TiO 2 has a nanorod-like structure.…”

“…MoS 2 , known for its distinctive layered structure, has garnered considerable interest because of its promising potential as a catalytic material, solid lubricant, lithium battery cathode, and semiconductor. 25 As an electrocatalyst for hydrogen synthesis, MoS 2 has been the subject of substantial research. Photogenerated electron and hole (e − /h + ) pairs may be transferred and recombined more slowly if a g-C 3 N 4 heterostructure is formed.…”