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Possible Origin of D- and G-band Features in Raman Spectra of Tribofilms

https://doi.org/10.1007/s11249-023-01728-1

Li, Yu-Sheng; Jang, Seokhoon; Khan, Arman Mohammad; Martin, Tobias V.; Ogrinc, Andrew L.; Wang, Q. Jane; Martini, Ashlie; Chung, Yip-Wah; Kim, Seong H. (June 2023, Tribology Letters)

In the Raman analysis of tribofilms produced from organic precursors, the D- and G-band features are often observed, which resemble the characteristic bands of diamond-like carbon (DLC), amorphous carbon (a-C), or graphitic materials. This study reports experimental evidence that the D- and G-bands features in the Raman spectra of tribofilms could be generated by photochemical degradation of triboproducts due to the focused irradiation of laser beam during the Raman analysis, indicating that they are not unique to the genuine structure of the tribofilm produced via friction. This finding suggests that other complementary and non-destructive characterization is required to determine whether DLC, a-C, or graphitic species are produced tribochemically by frictional shear.
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Achieving macroscale liquid superlubricity using glycerol aqueous solutions

https://doi.org/10.1016/j.triboint.2021.107006

Ma, Qiang; He, Tao; Khan, Arman Mohammad; Wang, Q.; Chung, Yip-Wah (August 2021, Tribology International)

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Relating Tribological Performance and Tribofilm Formation to the Adsorption Strength of Surface-Active Precursors

https://doi.org/10.1007/s11249-019-1249-5

Khan, Arman Mohammad; Wu, Hongxing; Ma, Qiang; Chung, Yip-Wah; Wang, Q. Jane (March 2020, Tribology Letters)

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Formation and Nature of Carbon-Containing Tribofilms

https://doi.org/10.1021/acsami.8b22496

Wu, Hongxing; Khan, Arman Mohammad; Johnson, Blake; Sasikumar, Kiran; Chung, Yip-Wah; Wang, Q. Jane (May 2019, ACS Applied Materials & Interfaces)

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Acid Treatment of Diamond-Like Carbon Surfaces for Enhanced Adsorption of Friction Modifiers and Friction Performance

https://doi.org/10.1007/s11249-018-1081-3

Khan, Arman Mohammad; He, Xingliang; Wu, Hongxing; Desanker, Michael; Erdemir, Ali; Chung, Yip-Wah; Wang, Q. Jane (December 2018, Tribology Letters)

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