scholarly journals Simple and Sensitive Multi-Components Detection Using Synthetic Nitrogen-Doped Carbon Dots Based on Soluble Starch

2021 ◽  
Author(s):  
Yuanyuan Hu ◽  
Wenxuan Ji ◽  
Jinjuan Qiao ◽  
Heng Li ◽  
Yun Zhang ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Tap Water ◽  
Hydrothermal Process ◽  
Soluble Starch ◽  
Indirect Detection ◽  
Ph Change ◽  
One Pot ◽  
Nitrogen Doped ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Abstract Although carbon dots (CDs) as fluorescent sensors have been widely exploited, multi-component detection using CDs without tedious surface modification is always a challenging task. Here, two kinds of nitrogen-doped CDs (NCD-m and NCD-o) based on soluble starch (SS) as carbon source were prepared through one-pot hydrothermal process using m-phenylenediamine and o-phenylenediamine as nitrogenous dopant respectively. Through fluorescence “on-off” mechanism of CDs, NCD-m and NCD-o could be used as a fluorescence sensor for detection of Fe 3+ and Ag + with LOD of 0.25 and 0.5 μM, respectively. Additionally, NCD-m could be used for indirect detection of ascorbic acid (AA) with LOD of 5 μM. Moreover, fluorescence intensity of NCD-m also exhibited the sensitivity to pH change from 2 to 13. More importantly, Both NCD-m and NCD-o had potential application for analysis of complicated real samples such as tap water, Vitamin C tablets and orange juice. Ultimately, the small size of NCD-m could contribute to reinforcing intracellular endocytosis, which allowed them to be used for bacteria imaging.

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.

scholarly journals Nitrogen-doped carbon dots for sensitive detection of ferric ions and monohydrogen phosphate by the naked eye and imaging in living cells

2021 ◽  
Author(s):  
Qiaoling Liu ◽  
Borong Ren ◽  
Kaixin Xie ◽  
Yanmei Yan ◽  
Ruirong Liu ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Carbon Dots ◽  
Living Cells ◽  
Sensitive Detection ◽  
Ferric Ions ◽  
One Pot ◽  
Nitrogen Doped ◽  
Naked Eye ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Nitrogen doped carbon dots (N-CDs) have been prepared via a one-pot hydrothermal method by using formamide and o-phenylenediamine as the carbon precursors for Fe3+ and HPO42− detection.

Nitrogen-doped carbon dots as a probe for the detection of Cu2+ and its cellular imaging

2019 ◽  
Vol 43 (11-12) ◽  
pp. 507-515 ◽  
Author(s):  
Ning Wang ◽  
Xuebing Li ◽  
Xuefang Yang ◽  
Zenglian Tian ◽  
Wei Bian ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Photoelectron Spectroscopy ◽  
Carbon Dots ◽  
Ph Value ◽  
Tap Water ◽  
Experimental Conditions ◽  
X Ray ◽  
Nitrogen Doped ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon dots were synthesized using citric acid monohydrate and glutathione as raw materials. The synthesized nitrogen-doped carbon dots were characterized by multiple analytical techniques, including transmission electron microscopy, Fourier transform infrared spectroscopy, ultraviolet–visible absorption spectroscopy, X-ray photoelectron spectroscopy, X-ray diffractometry, and fluorescence spectra. The fluorescence intensity of the nitrogen-doped carbon dots gradually quenched with different concentrations of Cu2+ ions. The effect of the pH value, the nitrogen-doped carbon dot concentration, and the reaction time on the fluorescence intensity of the N-CDs-Cu2+ system was investigated, and the experimental conditions were optimized. A rapid and sensitive method for the determination of Cu2+ ions was established that exhibited a good linearity in the concentration range 0.20–200.0 μM with a detection limit of 0.27 nM. Meanwhile, the fluorescence quenching mechanism of the interaction between nitrogen-doped carbon dots and Cu2+ was preliminarily discussed. The method was used to detect trace Cu2+ in tap water and lake water, with recoveries ranging from 98.1% to 102.0%. Furthermore, due to low cytotoxicity and good biocompatibility, nitrogen-doped carbon dots as a probe were also successfully used in bioimaging.

Green and economical synthesis of nitrogen-doped carbon dots from vegetables for sensing and imaging applications

RSC Advances ◽  
2015 ◽  
Vol 5 (115) ◽  
pp. 95223-95229 ◽  
Author(s):  
Xiaoqing Niu ◽  
Guosheng Liu ◽  
Luyao Li ◽  
Zheng Fu ◽  
Hang Xu ◽  
...  
Keyword(s):  
Carbon Source ◽  
Hydrothermal Treatment ◽  
Carbon Dots ◽  
Sole Carbon Source ◽  
Low Cost ◽  
One Pot ◽  
Nitrogen Doped ◽  
Sensing Platform ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

A green, simple and low-cost approach was present to obtain N-doped C-dots using vegetables as the sole carbon source through facile one-pot hydrothermal treatment. The C-dots can serve as a suitable sensing platform for detection of Cu2+.

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