Microplasma-enhanced synthesis of colloidal graphene quantum dots at ambient conditions. (November 2019)

• Record Type: Journal Article
• Authors: Yang, Jhih-Siang; Pai, David Z.; Chiang, Wei-Hung
• Is Part Of: Carbon. Volume 153(2019)
• Page Start: 315
• Page End: 319
• Publication Date: 2019-11
• Subjects: Graphene quantum dot -- Microplasma -- Synthesis -- Colloidal -- Atmospheric-pressure; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2019.07.024
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: 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.