title: Acid-free and oxone oxidant-assisted solvothermal synthesis of graphene quantum dots using various natural carbon materials as resources.
abstract: To prepare carbon-based fluorescent materials such as graphene quantum dots (GQDs), new and effective methods are needed to convert one-dimensional (1D) or two-dimensional (2D) carbon materials to 0D GQDs. Here, we report a novel acid-free and oxone oxidant-assisted solvothermal synthesis of GQDs using various natural carbon resources including graphite (G), multiwall carbon nanotubes (M), carbon fibers (CF), and charcoal (C). This acid-free method, not requiring the neutralization process of strong acids, exhibits a simple and eco-friendly purification process and also represents a recycling production process, together with mass production and high yield. Newly synthesized GQDs exhibited a strong blue photoluminescence (PL) under 365 nm UV light illumination. The PL emission peaks of all the recycled GQDs did not change.
authors.affiliation: Center for Smart Molecular Memory, Department of Chemistry and Department of Energy Science, Sungkyunkwan University, 2066 Seoburo, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea. hyoyoung@skku.edu.
authors.forename: Yonghun
authors.initials: Y
authors.lastname: Shin
authors.forename: Jintaek
authors.initials: J
authors.lastname: Park
authors.forename: Daesun
authors.initials: D
authors.lastname: Hyun
authors.forename: Junghee
authors.initials: J
authors.lastname: Yang
authors.forename: Jae-Hyeok
authors.initials: JH
authors.lastname: Lee
authors.forename: Jae-Ho
authors.initials: JH
authors.lastname: Kim
authors.forename: Hyoyoung
authors.initials: H
authors.lastname: Lee