Highly Fluorescent Nitrogen-Doped Graphene Quantum Dots’ Synthesis and Their Applications as Fe(III) Ions Sensor

Fei Lu,Yi-Hua Zhou,Sheng Cao,Li-Hui Wu,Ya-Feng Deng,Yuan Chen,Jun Qian

doi:10.1155/2019/8724320

Abstract

Nitrogen-doped graphene quantum dots (N-GQDs) with strong blue fluorescence and a high quantum yield of 88.9% were synthesized via a facile one-pot hydrothermal treatment with citric acid (CA) and ethylenediamine (EDA) as carbon and nitrogen sources, respectively. The blue fluorescence emission is independent of the excitation wavelengths. These N-GQDs dispersed well in water and ethyl alcohol and showed a highly selective and sensitive detection of hazardous and toxic Fe3+in the range of 1600μmol/L to 6000μmol/L through a fluorescence quenching process with a detection limit of 2.37μmol/L. Based on the excellent sensitivity and selectivity of N-GQDs to heavy metal ions, paper-based sensors can be fabricated by inkjet printing, which are rapid but low cost. So the visual instant on-site identification of heavy metal ion will be realized in the future.

Highlights

Graphene quantum dots (GQDs) are carbon nanoparticles with a diameter less than 10 nm and luminescent properties [1, 2]
Nitrogen-doped graphene quantum dots (N-GQDs)-Fe(III) N-GQDs Figure 3: FT-IR diagrams of N-GQDs prepared by citric acid: ethylenediamine=1:3 and N-GQDs-Fe3+
The typical lattice spacing is 0.290nm, which shows a graphitic structure of the as-obtained N-GQDs [33]

Summary

Introduction

Graphene quantum dots (GQDs) are carbon nanoparticles with a diameter less than 10 nm and luminescent properties [1, 2]. It has low preparation cost, good optical stability, low toxicity, good biocompatibility, and unique electronic properties [3,4,5,6]. It can be used as an electron acceptor or donor. For the occasions requiring on-site timely detection, especially for resource-poor countries and remote areas, test paper detection technology is very important, so the establishment of solid-phase fluorescence detection system has great research value and a bright prospect in exploitation system have in this paper

Experiment

Results and Discussion

Conclusion