Parameters affecting the synthesis of carbon dots for quantitation of copper ions

Lin, Yu‐Syuan; Lin, Yaling; Periasamy, Arun Prakash; Cang, Jinshun

doi:10.1039/c9na00137a

Cited by 19 publications

(12 citation statements)

References 65 publications

(78 reference statements)

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“…C dots with the maximum excitation/emission wavelengths of 365/440 nm were prepared electrochemically from glycine through polymerization, carbonization, and passivation processes under alkaline conditions 14d. Preparation of C dots from histidine could be conducted in alkaline aqueous solution electrochemically . During the synthesis, solution color changed from transparent, to light brown, then to dark brown, and finally to almost black; time‐evolution formation of the C dots are visible.…”

Section: Preparation Of C Dotsmentioning

confidence: 99%

Recent Advances and Sensing Applications of Carbon Dots

2019

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Carbon dots (C dots) with biocompatibility, brightness, stability against photoirradiation and salt, and ease in preparation have become important materials for sensing and imaging. They can be prepared from natural materials and small organic molecules through hydrothermal, microwave‐assistant, and electrochemical methods, with advantages of simplicity and low cost. To enhance the quantum yields of C dots in the red and near‐infrared regions, doping of C dots with heteroatoms such as nitrogen and sulfur has been suggested. C dots both with and without being functionalized recognition elements such as antibodies and aptamers are selective and sensitive for sensing of analytes, including metal ions (e.g., Fe3+, Hg2+, Cu2+), small molecules (e.g., H2O2, cysteine, glutathione), and biopolymers like proteins, as well as for in vitro and in vivo imaging. Depending on the size, charge, and surface ligands of C dots used to label cells, fluorescence images of different organelles are shown. Multicolor images of bacteria, mammalian cells, and plant tissues incubated with C dots are realized when excited at different wavelengths. In this review, many excellent sensing and imaging examples of C dots are presented to highlight their features and to show their challenges for analytical applications.

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Section: Preparation Of C Dotsmentioning

confidence: 99%

Recent Advances and Sensing Applications of Carbon Dots

2019

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“…The Raman spectrum of FeSO 4 clearly shows a sharp peak at 979 cm −1 attributed to the presence of S–O stretching bond [ 30 , 31 , 32 ]. The Raman spectrum of the NCDs after the treatment of Fe 2+ ions indicated that the peaks at (1322, 1587, and 1454) cm −1 , known as the disorder (D) band, crystalline (G) band [ 33 , 34 ], and -CH 2 stretching vibration [ 35 ], respectively, are more prominent compared to the non-treated NCDs, suggesting the initial characteristics of the NCDs appear after the removal of the fluorescence background due to the quenching fluorescent effect of Fe 2+ ions. In addition, a prominent peak found at 609 cm −1 in the Fe 2+ -treated NCDs is attributed to the formation of the Fe–O coordinate bond due to the coordinate bond formation between the Fe 2+ and O atoms on the surface of NCDs, while a weak peak in the same region was seen for FeSO 4 alone.…”

Section: Resultsmentioning

confidence: 99%

Fluorescent Carbon Dots for Sensitive and Rapid Monitoring of Intracellular Ferrous Ion

2022

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Although iron is an essential constituent for almost all living organisms, iron dyshomeostasis at a cellular level may trigger oxidative stress and neuronal damage. Hence, there are numerous reported carbon dots (CDs) that have been synthesized and applied to determine intracellular iron ions. However, among reported CDs focused to detect Fe3+ ions, only a few CDs have been designed to specifically determine Fe2+ ions over Fe3+ ions for monitoring of intracellular Fe2+ ions. We have developed the nitrogen-doped CDs (NCDs) for fluorescence turn-off detection of Fe2+ at cellular level. The as-synthesized NCDs exhibit a strong blue fluorescence and low cytotoxicity, acting as fluorescence probes to detect Fe2+ as low as 0.702 µM in aqueous solution within 2 min and visualize intracellular Fe2+ in the concentration range from 0 to 500 µM within 20 min. The as-prepared NCDs possess some advantages such as high biocompatibility, strong fluorescence properties, selectivity, and rapidity for intracellular Fe2+ monitoring, making NCDs an excellent nanoprobe for biosensing of intracellular ferrous ions.

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“…The Lin group reported a synthesis of I-CDs by adding NaI to salt acidified histidine under a 10 V applied voltage ( Figure 8 B) [ 92 ]. These I-CDs are susceptible to cross quenching, and their fluorescence intensity decreases with increasing Cu 2+ , Hg 2+ , and Ag + concentration.…”

Section: Halogen-doped Cdsmentioning

confidence: 99%

Halogen-Doped Carbon Dots: Synthesis, Application, and Prospects

Wen

2022

Molecules

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Carbon dots (CDs) have many advantages, such as tunable photoluminescence, large two-photon absorption cross-sections, easy functionalization, low toxicity, chemical inertness, good dispersion, and biocompatibility. Halogen doping further improves the optical and physicochemical properties of CDs, extending their applications in fluorescence sensors, biomedicine, photocatalysis, anti-counterfeiting encryption, and light-emitting diodes. This review briefly describes the preparation of CDs via the “top-down” and “bottom-up” approaches and discusses the preparation methods and applications of halogen (fluorine, chlorine, bromine, and iodine)-doped CDs. The main challenges of CDs in the future are the elucidation of the luminescence mechanism, fine doping with elements (proportion, position, etc.), and their incorporation in practical devices.

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Parameters affecting the synthesis of carbon dots for quantitation of copper ions

Abstract: A simple, eco-friendly, and low-cost electrochemical approach has been applied to the synthesis of carbon dots from histidine hydrochloride in the absence or presence of halides at various potentials up to 10 V.

Cited by 19 publications

References 65 publications

Recent Advances and Sensing Applications of Carbon Dots

Recent Advances and Sensing Applications of Carbon Dots

Fluorescent Carbon Dots for Sensitive and Rapid Monitoring of Intracellular Ferrous Ion

Halogen-Doped Carbon Dots: Synthesis, Application, and Prospects

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