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Indexed by:Journal Papers

Date of Publication:2021-07-21

Journal:DIAMOND AND RELATED MATERIALS

Volume:91

Page Number:255-260

ISSN No.:0925-9635

Key Words:Carbon dots; Solid state fluorescent; Tribological properties; Gaseous detonation

Abstract:Currently, the investigation on preparation, photoluminescence (PL) mechanism and application of solid state fluorescent CDs (SSFCDs) is still in the preliminary stage. It is particularly urgent to research on this issue. Herein, a one-pot gaseous detonation method is employed to directly synthesize SSFCDs within milliseconds using citric acid (CA) and urea as precursors for the fast time. The SSFCDs exhibit dependent emission with the excitation/emission maximum of 370/452 nm. On the basis of studying the structural and optical characteristics of the SSFCDs and thermal annealing SSFCDs (A-CDs) as well as the properties of gaseous detonation, we speculate the PL mechanism and formation mechanism of SSFCDs. More importantly, the prepared SSFCDs without any purification as additives for poly(ethylene glycol) (PEG) obtain a super-low mean friction coefficient of 0.024 and wear scar diameter of 0.57 mm under 600 N at optimal concentration of 0.5 wt%, reducing by 60.7% and 19.7% respectively in comparison with that of pure PEG. The SSFCDs-based additives reported here display excellent friction-reducing and antiwear performance for PEG.