RT Journal Article
SR Electronic
T1 Atomic-scale insights into the interfacial instability of superlubricity in hydrogenated amorphous carbon films
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaay1272
DO 10.1126/sciadv.aay1272
VO 6
IS 13
A1 Chen, Xinchun
A1 Yin, Xuan
A1 Qi, Wei
A1 Zhang, Chenhui
A1 Choi, Junho
A1 Wu, Sudong
A1 Wang, Rong
A1 Luo, Jianbin
YR 2020
UL http://advances.sciencemag.org/content/6/13/eaay1272.abstract
AB The origin of instability or even disappearance of the superlubricity state in hydrogenated amorphous carbon (a-C:H) film in the presence of oxygen or water molecules is still controversial. Here, we address this puzzle regarding the tribochemical activities of sliding interfaces at the nanoscale. The results reveal that gaseous oxygen molecules disable the antifriction capacity of a-C:H by surface dehydrogenation of tribo-affected hydrocarbon bonds. In comparison, oxygen incorporation into the hydrocarbon matrix induces the formation of a low-density surface shear band, owing to which the friction state depends on the oxygen content. High friction of a-C:H film in humid environment originates from the “tumor-like” heterogeneous structures as formed in the highly oxidized tribolayer. Notably, an appropriate doping of silicon can completely shield the moisture effect by forming a silica-like tribolayer. These outcomes shed substantial lights upon the roadmap for achieving robust superlubricity of carbon films in a wide range of environments.