One step electro-oxidative preparation of graphene quantum dots from wood charcoal as a peroxidase mimetic

2,2’-(Ethylenedioxy)bis(ethylamine)-functionalized graphene quantum dots (GQDs) were prepared under mild conditions from graphene oxide (GO) via oxidative fragmentation. The as-prepared GQDs have an average diameter of ca. 4 nm, possess good colloidal stability, and emit strong green-yellow light with a photoluminescence (PL) quantum yield of 22% upon excitation at 375 nm. We also demonstrated that the GQDs exhibit high photostability and the PL intensity is poorly affected while tuning the pH from 1 to 8. Finally, GQDs can be used to chelate Fe(II) and Cu(II) cations, scavenge radicals, and reduce Fe(III) into Fe(II). These chelating and reducing properties that associate to the low cytotoxicity of GQDs show that these nanoparticles are of high interest as antioxidants for health applications.

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Synthesis of N-doped graphene quantum dots by pulsed laser ablation with diethylenetriamine (DETA) and their photoluminescence

Physical Chemistry Chemical Physics ◽

10.1039/c7cp03993j ◽

2017 ◽

Vol 19 (33) ◽

pp. 22395-22400 ◽

Cited By ~ 22

Author(s):

S. R. M. Santiago ◽

T. N. Lin ◽

C. H. Chang ◽

Y. A. Wong ◽

C. A. J. Lin ◽

...

Keyword(s):

Quantum Dots ◽

Laser Ablation ◽

Graphene Quantum Dots ◽

Pulsed Laser ◽

Pulsed Laser Ablation ◽

Doped Graphene ◽

One Step

We report a facile, fast, and one-step approach to prepare N-doped graphene quantum dots (GQDs) using pulsed laser ablation with diethylenetriamine (DETA).

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One-Step Preparation of Nitrogen-Doped Graphene Quantum Dots With Anodic Electrochemiluminescence for Sensitive Detection of Hydrogen Peroxide and Glucose

Frontiers in Chemistry ◽

10.3389/fchem.2021.688358 ◽

2021 ◽

Vol 9 ◽

Author(s):

Zheng Yanyan ◽

Jing Lin ◽

Liuhong Xie ◽

Hongliang Tang ◽

Kailong Wang ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Quantum Dots ◽

Limit Of Detection ◽

Hydrothermal Process ◽

Graphene Quantum Dots ◽

Sensitive Detection ◽

Uniform Size ◽

Nitrogen Doped ◽

Nitrogen Doped Graphene ◽

One Step

Simple and efficient synthesis of graphene quantum dots (GQDs) with anodic electrochemiluminescence (ECL) remains a great challenge. Herein, we present an anodic ECL-sensing platform based on nitrogen-doped GQDs (N-GQDs), which enables sensitive detection of hydrogen peroxide (H2O2) and glucose. N-GQDs are easily prepared using one-step molecular fusion between carbon precursor and a dopant in an alkaline hydrothermal process. The synthesis is simple, green, and has high production yield. The as-prepared N-GQDs exhibit a single graphene-layered structure, uniform size, and good crystalline. In the presence of H2O2, N-GQDs possess high anodic ECL activity owing to the functional hydrazide groups. With N-GQDs being ECL probes, sensitive detection of H2O2 in the range of 0.3–100.0 μM with a limit of detection or LOD of 63 nM is achieved. As the oxidation of glucose catalyzed by glucose oxidase (GOx) produces H2O2, sensitive detection of glucose is also realized in the range of 0.7–90.0 μM (LOD of 96 nM).

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