Probing the Lubrication of Shear-Induced Self-Assembled Layer on Amorphous Carbon Films in Methane Atmosphere

Abstract Demand for reduction in friction and improvement in wear resistance of moving parts propels exploration in frictional origin for amorphous carbon (a-C) film lubricating properties based on the interfacial states. Methane, as an ideal energy carrier and industrial raw material, is one of active gas. Consequently, the relations between the tribological behaviors of a-C film under methane atmosphere and load or interfacial states were discussed based on experimental and theoretical methods. Experimental results illustrated that, as the load increased, tribological system exhibited various interfacial shear strength at a load of zero and pressure dependence of the shear strength for tribological systems. And then the origin was revealed with theoretical calculation and resulted from the distributions of adsorbates across the sliding interface.

Download Full-text

Probing the Lubrication of Shear-Induced Self-assembled Layer on Amorphous Carbon Films in Methane Atmosphere

Tribology Letters ◽

10.1007/s11249-021-01554-3 ◽

2022 ◽

Vol 70 (1) ◽

Author(s):

Lin Chen ◽

Jian Wu ◽

Zhibin Lu ◽

Lunlin Shang ◽

Guangan Zhang ◽

...

Keyword(s):

Amorphous Carbon ◽

Carbon Films ◽

Amorphous Carbon Films ◽

Self Assembled ◽

Self Assembled Layer

Download Full-text

Scanning Tunneling Microscopy of Amorphous Carbon Films

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100180343 ◽

1990 ◽

Vol 48 (1) ◽

pp. 318-319

Author(s):

Mircea Fotino ◽

D.C. Parks

Keyword(s):

Scanning Tunneling Microscopy ◽

Amorphous Carbon ◽

Carbon Films ◽

Atomic Scale ◽

Scanning Tunneling ◽

Tunneling Microscopy ◽

Amorphous Carbon Films ◽

Image Optimization ◽

Step Procedure ◽

Stm Images

In the last few years scanning tunneling microscopy (STM) has made it possible and easily accessible to visualize surfaces of conducting specimens at the atomic scale. Such performance allows the detailed characterization of surface morphology in an increasing spectrum of applications in a wide variety of fields. Because the basic imaging process in STM differs fundamentally from its equivalent in other well-established microscopies, good understanding of the imaging mechanism in STM enables one to grasp the correct information content in STM images. It thus appears appropriate to explore by STM the structure of amorphous carbon films because they are used in many applications, in particular in the investigation of delicate biological specimens that may be altered through the preparation procedures.All STM images in the present study were obtained with the commercial instrument Nanoscope II (Digital Instruments, Inc., Santa Barbara, California). Since the importance of the scanning tip for image optimization and artifact reduction cannot be sufficiently emphasized, as stressed by early analyses of STM image formation, great attention has been directed toward adopting the most satisfactory tip geometry. The tips used here consisted either of mechanically sheared Pt/Ir wire (90:10, 0.010" diameter) or of etched W wire (0.030" diameter). The latter were eventually preferred after a two-step procedure for etching in NaOH was found to produce routinely tips with one or more short whiskers that are essentially rigid, uniform and sharp (Fig. 1) . Under these circumstances, atomic-resolution images of cleaved highly-ordered pyro-lytic graphite (HOPG) were reproducibly and readily attained as a standard criterion for easily recognizable and satisfactory performance (Fig. 2).

Download Full-text