Noval Dual-Emission Fluorescence Carbon Dots as a Ratiometric Probe for Cu2+ and ClO- Detection.

Jiaqing Guo,Yutian Zeng,Jun Song,Hao Li,Haojie Cai,Shuai Ye,Wei Yan,Aikun Liu,Junle Qu,Feifan Zhou

doi:10.3390/nano11051232

Jiaqing Guo, Yutian Zeng + Show 8 more

Open Access

https://doi.org/10.3390/nano11051232

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Abstract

The use of carbon dots (CDs) with dual emission based on ratiometric fluorescence has been attracting attention in recent times for more accurate ion detection since they help avoid interference from background noise, probe concentration, and complexity. Herein, novel dual-emission nitrogen-doped CDs (NCDs) were prepared by a simple method for Cu2+ and ClO- detection. The NCDs showed excellent anti-interference ability and selectivity for different emissions. In addition, a good linear relationship was observed between the fluorescence intensity (FI) of the NCD solutions in different emissions with Cu2+ (0–90 μM) and ClO− (0–75 μM). The limits of both Cu2+ detection and ClO− were very low, at 17.7 and 11.6 nM, respectively. The NCDs developed herein also showed a good recovery rate in water for Cu2+ and ClO− detection. Hence, they are expected to have a more extensive application prospect in real samples.

Highlights

The use of carbon dots (CDs) with dual emission based on ratiometric fluorescence has been attracting attention in recent times for more accurate ion detection since they help avoid interference from background noise, probe concentration, and complexity
The XPS spectra of the nitrogendoped CDs (NCDs) showed that they contained C (29.8%), O (69.0%), and N (1.2%) elements
The fluorescence intensity (FI) quenched quickly when ClO− was added to the NCDs (Figure 2d). These results show that the NCDs are sensitive to both Cu2+ and ClO−

Summary

Introduction

Carbon dots (CDs) are widely used for ion detection [1,2,3], biological imaging [4,5], and disease diagnosis and treatment [6,7] because of their excellent optical properties, good biocompatibility, low biotoxicity, and low cost [8,9,10]. Dual-emission CDs based on ratiometric fluorescence have been used to develop novel methods for more accurate ion detection [19,20,21,22,23,24,25,26,27]. Nanomaterials 2021, 11, 1232 was gradually quenched by Cu2+ , while that at 644 nm maintained its original intensity throughout These CDs could be used as a ratiometric fluorescent sensor for Cu2+. Was added to the CD solutions, the emission center of the CDs at 470 nm displayed an obvious quenching effect. It is necessary to develop suitable dual-ratiometric probes for the accurate detection of common ions. This work explores novel dual-ratiometric nitrogen-doped carbon dots (NCDs) and uses them to effectively and simultaneously detect Cu2+ and ClO−

Chemicals

Instruments

Synthesis of NCDs

Analysis of Real Samples

Results and Discussion

Conclusions