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. 2019 Nov 15;5(11):eaax9301. doi: 10.1126/sciadv.aax9301

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).

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Fig. 3 — Molecular weight distribution of the hydrocarbon molecules generated after friction for (A) DLC-A, (B) DLC-D, and (C) DLC-E, in the range of 10 to 60 g/mol. Insets in (A) to (C) show the molecular weight distributions in the range of 200 to 1000 g/mol. The inset in (C) shows snapshots of two large hydrocarbon molecules. (D) Schematics of the generation of a hydrocarbon molecule (C_xH_y). Hydrocarbon C_xH_y is originally connected to the DLC substrate by several C─C bonds and subsequently desorbed by the dissociation of the connective C─C bonds.