Microplasma-enhanced synthesis of colloidal graphene quantum dots at ambient conditions

Jhih-Siang Yang , David Pai (1) , Wei-Hung Chiang

1 PPrime [Poitiers] - Institut Pprime [UPR 3346]

Here we report a bottom-up method to synthesize colloidal graphene quantum dots (GQDs) using microplasmas at ambient conditions. As-produced colloidal GQDs show 4.9 nm averaged diameter and exhibit room-temperature photoluminescence that peaks at 448 nm with a quantum efficiency of 1.5%. Solvated electrons (eaq−) generated by the microplasma interacting with the precursor solution were found to be critical for the GQD formation. Our study provides a simple method to synthesize colloidal GQDs and the insight to understand the fundamental factors involved in nano-sized graphene synthesis by microplasma-assisted liquid phase chemistry.

Mots clés: Graphene quantum dot; Microplasma; Synthesis; Colloidal; Atmospheric-pressure

Domaines: Mécanique des fluides [physics.class-ph]; Matériaux et structures en mécanique [physics.class-ph]; Physique Quantique [quant-ph]; Acoustique [physics.class-ph]; Biomécanique [physics.med-ph]; Matériaux; Polymères; Acoustique [physics.class-ph]; Automatique / Robotique; Electromagnétisme; Milieux fluides et réactifs; Energie électrique; Thermique [physics.class-ph]; Vibrations [physics.class-ph]; Physique mathématique [math-ph]

Jhih-Siang Yang, David Pai, Wei-Hung Chiang. Microplasma-enhanced synthesis of colloidal graphene quantum dots at ambient conditions. Carbon, 2019, 153, pp.315-319. ⟨10.1016/j.carbon.2019.07.024⟩. ⟨hal-02297780⟩