Biomimetic Synthesis of Copper/Polydopamine‐Functionalized Oxygenated Carbon Nitride Composites and Their Application as Lubricants

Abstract

The wet chemical reduction method was used to modify polydopamine (PDA) functionalized oxygenated carbon nitride (O‐g‐C3N4) nanosheets to prepare in situ growth of Cu nanoparticles (Cu NPs) decorated on nanosheets. The PDA attached to the surface of O‐g‐C3N4 provided a uniformly distributed platform for copper nanoparticles. It also provided rich functional groups and provided good conditions for the dispersion of Cu/PDA/O‐g‐C3N4 in pure oil. Through TEM testing, Cu NPs with a diameter of 5–10 nm were evenly distributed on the PDA/O‐g‐C3N4 nanosheets. Through the sliding test on the steel surface, it was obvious that adding 0.2 wt % Cu/PDA/O‐g‐C3N4 to pure oil had a lowest coefficient of friction. In addition, the wear marks on the surface of Cu/PDA/O‐g‐C3N4 steel discs were studied with an optical microscope and a three‐dimensional profiler and its wear resistance was better than Cu NPs, O‐g‐C3N4 and Cu/O‐g‐C3N4.

Emerging Chemical Functionalization of g-C3N4: Covalent/Noncovalent Modifications and Applications

“…(c) Schematic of the formation of PDA-attached O-g-C 3 N 4 nanocomposites. Reproduced with permission from ref . Copyright 2020 Wiley and Sons.…”

“…Sometimes the functionalization of g-C 3 N 4 is conducted for other purposes. As an example, polydopamine (PDA)-functionalized oxygenated carbon nitride nanosheets were used to prepare copper nanoparticles decorated on nanosheets . In this work, the surface of O-g-C 3 N 4 was functionalized with PDA (Figure c) to provide (i) uniformly distributed PDA platform for copper nanoparticles, (ii) rich functional groups, and (iii) good conditions for the dispersion of O-g-C 3 N 4 in pure oil.…”

“…As an example, polydopamine (PDA)-functionalized oxygenated carbon nitride nanosheets were used to prepare copper nanoparticles decorated on nanosheets. 201 In this work, the surface of O-g-C 3 N 4 was functionalized with PDA (Figure 47c) to provide (i) uniformly distributed PDA platform for copper nanoparticles, (ii) rich functional groups, and (iii) Covalent chemical functionalization can be used to prepare stable nanocomposites, which can promote charge transfer properties. As an example, Yang et al 202 used O-g-C 3 N 4 rich in hydroxyl and carboxyl functional groups as a support to improve stability and possibly to connect with (CH 3 O) 3 SiC 6 H 4 CH 2 Cl (Figure 48a).…”

Effect of copper oxide@boron nitride nanosheet hybrid nanocomposite on tribological properties of paraffin liquid

“…However, as the elevation of the synthesis tactics for nanocomposites, many researches have demonstrated hybrid nano-material can effectively enhance the lubrication properties, due to the synergistic effect [3,4,[19][20][21][22][23][24][25]. The decoration of Fe 3 O 4 on h-BN can promote the dispersion of Fe 3 O 4 in oil.…”

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

“…It has been demonstrated that carbon nitride film deposited on roller bearings could extend the utilization of service life via magnetron sputtering because of wear resistance and film adhesion [17–19] . The g‐C 3 N 4 containing C, N and little H elements make it have better binding ability in polymers [20–22] . Additionally, g‐C 3 N 4 can be also applied to oil lubrication.…”