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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. 1 — (A) Operando QMS detection results for the fragment ions of methane (CH₃⁺; m/z = 15), ethylene (C₂H₃⁺; m/z = 27), ethane (C₂H₅⁺; m/z = 29), propane (C₃H₇⁺; m/z = 43), and butane (C₄H₉⁺; m/z = 57) during the friction experiment of DLC. The experiment is conducted from 1 to 6 min. Blue dashed lines indicate the background intensities of each fragment ion in the experiment chamber. (B) Molecular weight distribution of hydrocarbon molecules emitted after friction test.