Gram-Scale Synthesis of Graphene Quantum Dots from Single Carbon Atoms Growth via Energetic Material Deflagration

Abstract

Graphene quantum dots (GQDs) with quantum confine and size effect is proposed to be applicable in photovoltaic, nano devices and so on, due to extraordinary electronic and optical properties. Here we report a facile approach to synthesize gram-scale GQDs from active carbon atoms, which are obtained via the deflagration reaction of Polytetrafluoroethylene (PTFE) and Si, growing from highto low-temperature zones when travelling through the deflagration flame in a short time with releasing gas as the carrier medium. The prepared GQDs were aggregated into carbon nanospheres, thus Hummer's method was utilized to exfoliate the GQDs aggregations into individual GQDs. We show that the length of GQDs is ~10 nm and the exfoliated GQDs solution presents an obvious fluorescence effect with a strong emission peak at 570 nm at 460 nm excitation. And these GQDs are demonstrated to be excellent probes for cellular imaging. Furthermore, we propose a growth mechanism based on computer simulation, which is well verified by experimental reproduction. Our study opens up a promising route for high-yield and high-quality GQDs, as well as other various quantum dots.

A novel graphene hybrid for reducing fire hazard of epoxy resin

“…Graphene oxide was prepared through the modified Hummers's method . Typically, α‐ZrP‐RGO was synthesized as follows: first, 0.2 g of GO was dispersed homogeneously in 80 mL of deionized water with ultrasonic treatment for about 1 hour.…”

“…Graphene oxide was prepared through the modified Hummers's method. 28 Typically, α-ZrP-RGO was synthesized as follows: first, the product was dried at 60°C in a vacuum oven for 24 hours. For comparison, α-ZrP and RGO were prepared under the same conditions.…”

The New Graphene Family Materials: Synthesis and Applications in Oxygen Reduction Reaction

“…Chemical acid oxidation [41,46,47], the electrochemical approach [38,48,49], the hydrothermal or solvothermal cutting method [50][51][52] and the physical method [53,54] are employed to synthesize GQDs.…”

Effect of different ionic layered compounds decorated with zinc hydroxystannate on flame retardancy and smoke performance of epoxy resin

“…By a modified Hummers's method according to reference, α‐ZrP was prepared . ZHS@α‐ZrP was prepared by coprecipitation; 2.0g α‐ZrP was dissolved in 100‐mL deionized water.…”

“…By a modified Hummers's method according to reference, α-ZrP was prepared. 17 ZHS@α-ZrP was prepared by coprecipitation; 2.0g α-ZrP was dissolved in 100-mL deionized water. Then, 2.97 g Zn (NO 3 ) 2 ·6H 2 O was dissolved in 45mL ultrapure water to prepare solution, and it was added into the beaker to be magnetically stirred for 6 hours.…”