Laser-induced graphene (LIG) films, with their simple fabrication and low cost, have attracted extensive research interest for applications in energy storage and flexible electronics. Despite the loose structure of LIG films, they exhibit exceptional wear resistance, which makes them promising candidates for tribological applications. In this study, we developed laser-induced nanoparticles@graphene (NP@LIG) films by direct laser writing of polyimide solutions containing dispersed nanoparticles (nanodiamonds and SiO 2). Transmission electron microscopy (TEM) characterization revealed that the incorporated nanoparticles induced the formation of graphene nanoscrolls within the composite films. Friction tests showed that nanoparticle concentrations of 0.2–2.5 mg/ml nanodiamonds or 0.3 mg/ml SiO 2 lowered the friction coefficient from 0.1 for pure LIG to about 0.05, while higher concentrations increased friction and degraded film wear life. The optimized NP@LIG films maintained a low friction coefficient for over 5000 cycles. The low friction mechanism was attributed to the nanoparticles promoting the formation of graphene nanoscrolls in the transfer film during friction, reducing the real contact area and minimizing exposed interfacial dangling bonds. This simple and efficient fabrication method, along with the approach to reducing the friction coefficient, demonstrates great potential for large-scale applications in lubrication and protective coatings.
周老师: 13321314106
王老师: 17793132604
邮箱号码: lub@licp.cas.cn