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

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1232
Author(s):  
Jiaqing Guo ◽  
Aikun Liu ◽  
Yutian Zeng ◽  
Haojie Cai ◽  
Shuai Ye ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Background Noise ◽  
Good Recovery ◽  
Ratiometric Fluorescence ◽  
Dual Emission ◽  
Simple Method ◽  
Real Samples ◽  
Nitrogen Doped ◽  
Probe Concentration ◽  
Ratiometric Probe

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.

scholarly journals A Novel Ratiometric Probe Based on Nitrogen-Doped Carbon Dots and Rhodamine B Isothiocyanate for Detection of Fe3+in Aqueous Solution

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Lin Liu ◽  
Lu Chen ◽  
Jiangong Liang ◽  
Lingzhi Liu ◽  
Heyou Han
Keyword(s):  
Rhodamine B ◽  
Carbon Dots ◽  
Dynamic Range ◽  
Tap Water ◽  
Buffer Solution ◽  
Nitrogen Doped ◽  
Rhodamine B Isothiocyanate ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon ◽  
Ratiometric Probe

A ratiometric probe for determining ferric ions (Fe3+) was developed based on nitrogen-doped carbon dots (CDs) and rhodamine B isothiocyanate (RhB), which was then applied to selective detection of Fe3+in PB buffer solution, lake water, and tap water. In the sensing system, FePO4particles deposit on the surface of CDs, resulting in larger particles and surface passivation. The fluorescence (FL) intensity and the light scattering (LS) intensity of CDs can be gradually enhanced with the addition of Fe3+, while the FL intensity of RhB remains constant. The ratiometric light intensity of CDs LS and RhB FL was quantitatively in response to Fe3+concentrations in a dynamic range of 0.01–1.2 μM, with a detection limit as low as 6 nM. Other metal ions, such as Fe2+, Al3+, K+, Ca2+, and Co2+, had no significant interference on the determination of Fe3+. Compared with traditional probes based on single-signal probe for Fe3+detection, this dual-signal-based ratiometric probe exhibits a more reliable and stable response on target concentration and is characterized by easy operation in a simple fluorescence spectrophotometer.

Dual-emission ratiometric probe combining carbon dots and CdTe quantum dots for fluorometric and visual determination of H2O2

2019 ◽  
Vol 296 ◽  
pp. 126665 ◽  
Author(s):  
Rafael C. Castro ◽  
José X. Soares ◽  
David S.M. Ribeiro ◽  
João L.M. Santos
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Cdte Quantum Dots ◽  
Dual Emission ◽  
Ratiometric Probe

Visual and ratiometric fluorescence detection of Hg2+ based on a dual-emission carbon dots-gold nanoclusters nanohybrid

2018 ◽  
Vol 259 ◽  
pp. 1082-1089 ◽  
Author(s):  
Huizhi Xie ◽  
Jing Dong ◽  
Junling Duan ◽  
Geoffrey I.N. Waterhouse ◽  
Juying Hou ◽  
...  
Keyword(s):  
Fluorescence Detection ◽  
Carbon Dots ◽  
Gold Nanoclusters ◽  
Ratiometric Fluorescence ◽  
Dual Emission

Facile synthesis of red dual-emissive carbon dots for ratiometric fluorescence sensing and cellular imaging

Nanoscale ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 5494-5500 ◽  
Author(s):  
Yang Hu ◽  
Zhengbiao Yang ◽  
Xuan Lu ◽  
Jiazhuang Guo ◽  
Rui Cheng ◽  
...  
Keyword(s):  
Hydrothermal Treatment ◽  
Carbon Dots ◽  
Cellular Imaging ◽  
Ratiometric Fluorescence ◽  
Fluorescence Sensing ◽  
Facile Synthesis ◽  
Dual Emission ◽  
Ratiometric Fluorescence Sensing

Carbon dots synthesized by the hydrothermal treatment of dicyandiamide and o-phenylenediamine in dilute H2SO4 exhibit efficient excitation-independent red dual-emission useful for ratiometric fluorescence sensing and cellular imaging.

Carbon dots based dual-emission silica nanoparticles as ratiometric fluorescent probe for chromium speciation analysis in water samples

2018 ◽  
Vol 96 (1) ◽  
pp. 72-77 ◽  
Author(s):  
Guoqiang Xiang ◽  
Yue Ren ◽  
Heng Zhang ◽  
Huanhuan Fan ◽  
Xiuming Jiang ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Water Samples ◽  
Carbon Dots ◽  
Speciation Analysis ◽  
Chromium Speciation ◽  
Ratiometric Fluorescence ◽  
Dual Emission ◽  
Acid Type ◽  
Optimized Conditions ◽  
Ratiometric Fluorescent Probe

A simple and effective strategy for designing a ratiometric fluorescent nanosensor was described. A carbon dots (CDs) based dual-emission nanosensor for chromium speciation analysis was developed by coating CDs on the surface of dye-doped silica nanoparticles. The fluorescence of the resulting dual-emission silica nanoparticles was quenched in acetic acid through potassium bromate (KBrO3) oxidation. Cr(VI) was able to catalyze KBrO3 oxidation, resulting in ratiometric fluorescence accelerated quenching response of the dual-emission silica nanoparticles. Several important parameters affecting the nanosensor performance, including acid type, concentrations of KBrO3, and reaction temperature and time were examined. Under the optimized conditions, the detection limit of the nanosensor towards Cr(VI) reached 1.3 ng mL−1, and pretty good linearity was obtained between 20 to 500 ng mL−1. More importantly, the sensor was found suitable for speciation analysis of both Cr(III) and Cr(VI) in different water samples with satisfactory results.

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