Enhancing the luminescence of carbon dots by doping nitrogen element and its application in the detection of Fe(III)

Abstract

Carbon dots (CDs) attract great interests from scientists for their low toxicity and biocompatibility properties and their important applications in the fields of photocatalysts, batteries, bio-images and supercapacitors. Most strategies of making CDs contain several steps, which can be a time-consuming and costly procedure. In this study, nitrogen-doped CDs have been prepared by a onestep hydrothermal strategy with sodium citrate and ethylenediamine as precursors. It is found that fluorescence intensity of CDs is enhanced with the increased content of doped nitrogen, which implies that nitrogen-doped element plays an important role to improve the fluorescence intensity of CDs. Most importantly, those CDs yielded high selectivity of Fe 3? , with good linearity, precision and accuracy. Hence, the as-prepared nitrogen-doped CDs could be used as probes for quantitative analysis of Fe 3? in environmental applications.

Fabrication of highly active phosphatase-like fluorescent cerium-doped carbon dots for in situ monitoring the hydrolysis of phosphate diesters

“…S2 † for comparison), which could be attributed to the homogeneous surface structure, and monodispersity of the CeCDs. 44,45 In addition, the average uorescence quantum yield (QY) of the CeCDs in aqueous solution at room temperature was measured to be 27% using quinine sulfate as a reference (QY of quinine sulfate is 54% at 350 nm excitation wavelength), which is comparable with that in the previous reported CDs. 46 However, the QY of the Ce-free bare CDs was only 13%, lower than that of the CeCDs.…”

Synthesis of cellulose-derived carbon dots using acidic ionic liquid as a catalyst and its application for detection of Hg2+

“…Thus they have shown great potential in bioimaging [3][4][5], photocatalysis [6], electrocatalysis [7], and chemical sensing [8][9][10][11]. In 2004, CDs were first discovered accidentally during the separation and purification of single-walled carbon nanotubes [12].…”

Near infrared quantum dots in biomedical applications: current status and future perspective

“…Group IV NIR QDs is a special kind of QDs which contain only one element. Among them, the research of synthesis and application of CDs received the most attentions . Lin et al reported NIR emissive CDs (683 nm) capable of excitation with a NIR femtosecond pulse laser.…”