One‐Pot Synthesis of Highly Fluorescent Carbon Dots from Spinach and Multipurpose Applications

Ren, Guojuan; Tang, Mingyu; Chai, Fang; Wu, Huilu

doi:10.1002/ejic.201701080

Cited by 35 publications

(8 citation statements)

References 43 publications

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“…The limit of detection of Cr(VI) and 4-NP by N-CDs(II) and those reported in the literature for different types of carbon dots are presented in Table A and Table , respectively. − It revealed that the probe developed by us, i.e., N-CDs(II), is efficient for detecting Cr(VI) and 4-NP. In addition, our method provides an option for detecting Cr(VI) as CrO 4 2– .…”

Section: Resultsmentioning

confidence: 75%

N-Doped Carbon Dots Synthesized from Ethylene Glycol and β-Alanine for Detection of Cr(VI) and 4-Nitrophenol via Photoluminescence Quenching

Das

2021

ACS Appl. Nano Mater.

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We present here a facile method for nonaqueous synthesis of highly crystalline nitrogen-doped carbon dots (N-CDs) via oligomerization of ethylene glycol while heating with βalanine at 170 °C for 30 min. It exhibited bright bluish photoluminescence (PL) at λ emission = 461 nm, corresponding to a relative PL quantum yield of 14.3% and an average PL lifetime of 7.4 ns. High-resolution transmission electron microscopy of N-CDs revealed systematically self-assembled transverse oligomeric chains of ethylene glycol doped with β-alanine to form hexagonal symmetry, and their crystalline nature was revealed from electron diffraction measurement. The structure and composition of N-CDs are deduced from 13 C nuclear magnetic resonance, highresolution mass spectrometry, Fourier transform infrared spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy measurements, which collectively suggested oligomerization of β-alanine-doped ethylene glycol. The N-CDs are then demonstrated as an efficient probe for quantitative detection of Cr(VI) species at different pHs and 4-nitrophenol (4-NP) via PL quenching. The limits of detection (LoD) are deduced from respective linear Stern−Volmer plots, e.g., 1.1 μM for H 2 CrO 4 (at pH 0.9), 2.5 μM for HCrO 4 − (at pH 3.5), and 0.29 μM for CrO 4 2− (at pH 9.0). The detection of Cr(VI) is highly selective against several cationic (e.g.

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Section: Resultsmentioning

confidence: 75%

N-Doped Carbon Dots Synthesized from Ethylene Glycol and β-Alanine for Detection of Cr(VI) and 4-Nitrophenol via Photoluminescence Quenching

Das

2021

ACS Appl. Nano Mater.

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“…Different chemical precursors such as ethylenediaminetetraacetic acid (EDTA) (Ankireddy and Kim, 2018;Yang et al, 2020), citric acid (Fang et al, 2017) and reduced glutathione (Vaz et al, 2017), and ethylene glycol ) also have been used as the source to synthesize C-Dots. Wide applications of C-Dots in biomedical applications for instance drug delivery (D'souza et al, 2018), biosensing (Sarkar et al, 2018), bioimaging (Yang et al, 2014;Ren et al, 2018;Amjad et al, 2019) and gene transfer (Mohammadinejad et al, 2019), make it more suitable to move from chemical precursors to organic precursors. For example, numerous biomass has been used for the synthesis of C-Dots in recent years including papaya waste (Pooja et al, 2019), prawn shells (Gedda et al, 2016), grilled fish (Bi et al, 2017), Lycii Fructus (Sun et al, 2017), milk (Bajpai et al, 2019) fruit juices (Atchudan et al, 2018), etc.…”

Section: Green Synthesis Of Multifunctional C-dotsmentioning

confidence: 99%

A Review on Multifunctional Carbon-Dots Synthesized From Biomass Waste: Design/ Fabrication, Characterization and Applications

et al. 2021

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Carbon-Dots (C-Dots) have drawn much attention in recent years owing to their remarkable properties such as high biocompatibility, low toxicity, nano-scale size, and ease of modification with good tuneable photoluminescence performance. These unique properties have led C-Dots to become a promising platform for bioimaging, metal ion sensing and an antibacterial agent. C-Dots can be prepared using the top-down and bottom-up approaches, in which the latter method is commonly used for large scale and low-cost synthesis. C-Dots can be synthesized using sustainable raw materials or green biomass since it is environmentally friendly, in-expensive and most importantly, promotes the minimization of waste production. However, using biomass waste to produce high-quality C-Dots is still a matter of concern waiting for resolution, and this will be the main focus of this review. Fundamental understanding of C-Dots such as structure analysis, physical and chemical properties of C-Dots, various synthesis methodology and type of raw materials used are also discussed and correlated comprehensively. Additionally, factors affecting the bandgap of the C-Dots and the strategies to overcome these shortcomings are also covered. Moreover, formation mechanism of C-Dots focusing on the hydrothermal method, option and challenges to scale up the C-Dots production are explored. It is expected that the great potential of producing C-Dots from agricultural waste a key benefit in view of their versatility in a wide range of applications.

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“…As shown in Figure 9 a–c, strong emission peaks at 473 nm at 320 nm excitation wavelength were observed for p-NA by ZnWO 4 , NiWO 4 , and ZnNiWO 4 in a methanol environment, which suggested that p-NA was most comprehended by metal tungstate and mixed metal tungstate nanoparticles. This phenomenon could have been caused by the hydrogen bond and the strong radiative transitions between tungsten and oxygen within the (WO 6 ) 6− molecular complex [ 36 , 41 ]. The order of detection was found to be p-NA > 2-NP > m-NP > 4-NB.…”

Section: Resultsmentioning

confidence: 99%

Fluorometric Sensing and Detection of p-Nitroaniline by Mixed Metal (Zn, Ni) Tungstate Nanocomposite

et al. 2023

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Aromatic amines are important chemical intermediates that hold an irreplaceable significance for synthesizing many chemical products. However, they may react with substances excreted from human bodies to generate blood poisoning, skin eczema, and dermatitis disease and even induce cancer-causing high risks to human health and the environment. Metal tungstates have been proven to be highly efficient materials for developing various toxic gases or chemical detection sensor systems. However, the major factors of the sensors, such as sensitivity, selectivity, stability, response, and recovery times, still need to be optimized for practical technological applications. In this work, Ni-doped ZnWO4 mixed metal tungstate nanocomposite material was synthesized by the hydrothermal method and explored as a sensor for the fluorometric determination of p-nitroaniline (p-NA). Transmission electron microscopy (TEM) was used for the elucidation of the optimized particle diameter. Scanning electron microscopy (SEM) was employed to observe the surface morphological changes in the material during the solid-state reactions. The vibration modes of as-prepared samples were analyzed using Fourier-transform infrared spectroscopy (FTIR). The chemical bonding and oxidation states of individual elements involved in material synthesis were observed using X-ray photoelectron spectroscopy (XPS). The PL activities of the metal tungstate nanoparticles were investigated for the sensing of p-nitroaniline (p-NA). The obtained results demonstrated that ZnNiWO4 was more effective in sensing p-NA than the other precursors were by using the quenching effect. The material showed remarkably high sensitivity towards p-NA in a concentration range of 25–1000 μM, and the limit of detection (LOD) value was found to be 1.93 × 10−8 M for ZnWO4, 2.17 × 10−8 M for NiWO4, and 2.98 × 10−8 M for ZnNiWO4, respectively.

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One‐Pot Synthesis of Highly Fluorescent Carbon Dots from Spinach and Multipurpose Applications

Cited by 35 publications

References 43 publications

N-Doped Carbon Dots Synthesized from Ethylene Glycol and β-Alanine for Detection of Cr(VI) and 4-Nitrophenol via Photoluminescence Quenching

N-Doped Carbon Dots Synthesized from Ethylene Glycol and β-Alanine for Detection of Cr(VI) and 4-Nitrophenol via Photoluminescence Quenching

A Review on Multifunctional Carbon-Dots Synthesized From Biomass Waste: Design/ Fabrication, Characterization and Applications

Fluorometric Sensing and Detection of p-Nitroaniline by Mixed Metal (Zn, Ni) Tungstate Nanocomposite

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