Robust Superlubric Interface across Nano- and Micro-Scales Enabled by Fluoroalkylsilane Self-Assembled Monolayers and Atomically Thin Graphene

Abstract

Robust superlubrication across nano-and microscales is highly desirable at the interface with asperities of different sizes in durable micro/nanoelectromechanical systems under a harsh environment. A novel method to fabricate superlubric interfaces across nano-and microscales is developed by combining a batch of surface modification with atomically thin graphene. The robust superlubric interface across nano-and microscales between hydrophobic 1H,1H,2H,2H-perfluorodecyltrichlorosilane (FDTS) self-assembly monolayers (SAMs) and graphene was achieved under high relative humidity, sliding speed, and contact pressure. The superlubric mechanisms at the interface of FDTS/graphene could be attributed to the following at different scales: the hydrophobicity of FDTS SAMs and graphene preventing the capillary interaction of the interfacial friction under high relative humidity; the high elastic modulus of graphene leading to small interfacial contact area; the compressing and orientating of FDTS SAMs decreasing interfacial shear strength under high contact pressure; the surface modification of FDTS molecules reducing the interfacial potential barriers when sliding on the atomically thin graphene. The robust superlubric interface across nano-and microscales reducing the friction at the complicated interfaces with asperities at different scales and improving the performance and durability have great potentials in the field of micro/nano mechanical systems.

Carbon Nanocoils/Carbon Foam as the Dynamically Frequency‐Tunable Microwave Absorbers with an Ultrawide Tuning Range and Absorption Bandwidth

“…The real part (ε′) (Equation S3, Supporting Information) and imaginary part (ε′′) (Equation S4, Supporting Information) of complex permittivity correspond to the storage and dissipation of electrical energy, respectively. [40][41][42][43] The lowest permittivity of CF and CNCs/CF at 600 °C annealing is due to the formation of carbon skeletons with poor conductivity at a lower carbonization temperature (Figures S8 and S9, Supporting Information). As the carbonization temperature increases, higher conductivity and permittivity are obtained.…”

Achieving Ultralow Friction Under High Pressure Through Operando Formation of Pbs Qds/Graphene Heterojunction with 0d/1d Nanostructure

“…Applying lubrication is one of the most efficient ways to address friction and wear issues. Solid lubricants, e.g., two-dimensional (2D) graphene, molybdenum disulfide (MoS 2 ), and tungsten disulfide possess the ability to diminish friction by generating self-lubricating films via chemical reactions or physical adsorptions at the sliding interfaces where friction occurs [4][5][6]. There is a very low friction between MoS 2 layers due to its unique layered structure, and weak interlaminar interaction.…”