Facile synthesis and optical properties of nitrogen-doped carbon dots

Niu, Jingjing; Gao, Hui; Wang, Litao; Xin, Shuangyu; Zhang, Gang-Yi; Wang, Qian; Guo, Linna; Liu, Wenjing; Gao, Xiu Ping; Wang, Yuhua

doi:10.1039/c3nj01068f

Cited by 84 publications

(52 citation statements)

References 44 publications

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“…Raman spectra of C-dots usually present two main first-order bands [3,27,32,41,88,129,[144][145][146][147][148][149]. The D band represents the vibrations of carbon atoms with dangling bonds in the termination plane of disordered graphite or glassy carbon.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…Taking together all the information from literatures which characterized C-dots by UV-vis and PL spectroscopy [31,37,41,85,87,103,139], all types of C-dots are active in the UV-vis region of the electromagnetic spectrum, and the fluorescent emission of C-dots shows ex -dependent behavior. Recently, the timeresolved PL spectroscopy has been reported to be useful in measuring the photoluminescent lifetime of C-dots [37,41,87,103,139]. A typical example of UV-vis absorption spectra, PL spectra at different ex and time-resolved PL spectra of waste frying oil-derived sulfur-doped carbon dots (S-C-dots) [87], is depicted in Figure 4.…”

Section: Ultraviolet-visible and Photoluminescence Spectroscopymentioning

confidence: 99%

“…In the case of IR analysis of C-dots samples, apart from the evaluation of hydroxyl (-OH) and carbonyl (C=O) functional groups on the C-dots surface [41,49,69,127], IR is also able to examine the doping of heteroatoms into the C-dots framework. Important examples include the identification of the presence of amide/amine (-CN/NH 2 ) [15,20,21,[37][38][39][40][41][42][43][44][45][46], alkyl sulfide (C-S) [33,[46][47][48][49], organosiloxane (Si-OSi/Si-O-C) [89,127,140,141], phosphates (P=O and P-O-R) [38,49,93], and boronic acid (B-O and B-N) [114,142,143] moieties attached on the surface of C-dots, providing evidence for introduction of nitrogen (N), sulfur (S), silicon (Si), phosphorus (P), and boron (B) heteroatoms into Cdots. The merits of this technique for the characterization of surface functionalization of C-dots are being low cost, simple, rapid, and easy for sample preparation.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

“…Recently, there is a considerable interest in developing labor, material, and energy efficient synthetic methods for C-dots such as carbonization of naturally available bioresources [15,19,24,26,27,[30][31][32][33][34][35][36][37], preparation with low heating temperature [38], and synthesis without external heating [39,40]. In addition, the flexibility in modification and functionalization of the C-dots surface has opened many possibilities in the incorporation of heteroatoms such as nitrogen [15,20,21,[37][38][39][40][41][42][43][44][45][46], sulfur [33,[46][47][48][49], phosphorous [39,49], and silane [50] into C-dots framework to enhance the PL properties of C-dots.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and Analytical Separation of Fluorescent Carbon Nanodots

Gong

Liu

et al. 2017

Journal of Nanomaterials

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Carbon nanodots (C-dots) are recently discovered fluorescent carbon nanoparticles with typical sizes of <10 nm. The C-dots have been reported to have excellent photophysical and chemical characteristics. In recent years, the advances in the development and improvement in C-dots synthesis, characterization, and applications are burgeoning. In this review, we introduce the most commonly used techniques for the characterization of C-dots. The characterization techniques for C-dots are briefly classified, described, and illustrated with applied examples. In addition, the analytical separation methods for C-dots (including electrophoresis, chromatography, density gradient centrifugation, differential centrifugation, solvent extraction, and dialysis) are included and discussed according to their analytical characteristics. The review concludes with an outlook towards the future developments in the characterization and the analytical separation of C-dots. The comprehensive overview of the characterization and the analytical separation techniques will safeguard people to use each technique more wisely.

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Section: Raman Spectroscopymentioning

confidence: 99%

Section: Ultraviolet-visible and Photoluminescence Spectroscopymentioning

confidence: 99%

Section: Infrared Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization and Analytical Separation of Fluorescent Carbon Nanodots

Gong

Liu

et al. 2017

Journal of Nanomaterials

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“…C.dots are spherical, oxygenous carbon nanoparticles with size below 10 nm. C.dots akin to Q.dots show several interesting properties such as excitation-dependent emission, chemical and photostability, enhanced fluorescence quantum yields and the possibility of fine-tuning the sensing properties by surface modification [5][6][7][8][9][10][11] In order to improve the photophysical and photochemical properties of C.dots, hetero-atom doped C.dots are synthesized by different ways. Among them, nitrogendoped C.dots received much attention because of their good biocompatibility and the related broad applications in the areas of bio-imaging, electrocatalysis and sensors 25,26 .…”

mentioning

confidence: 99%

One-Step Microwave-Assisted Green Synthesis of Luminescent N-Doped Carbon Dots from Sesame Seeds for Selective Sensing of Fe(III)

Roshni¹,

Divya²

2017

Current Science

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The present study focuses on the green synthesis of nitrogen-doped carbon dots (C.dots) from sesame seeds using microwave pyrolysis method. The C.dots obtained were characterized and extensively studied using transmission electron microscopy (TEM), UV/ visible spectroscopy, fluorescence spectroscopy and Fourier transform infra-red spectroscopy (FTIR) techniques. The results indicated the presence of highly fluorescent, aqueous soluble and significantly photostable C.dots with a quantum yield of 8.02%. The average size distributions of C.dots were found to be 5 nm. These C.dots were effectively applied as a selective sensor for Fe(III) as the fluorescence intensity was significantly quenched with increasing metal concentrations. The limit of detection (LOD) was found to be 2.56 M of Fe(III). This study demonstrates a low cost, environmental friendly and waste recyclable synthetic method for preparation of C.dots and its application as a selective Fe(III) sensor.Keywords: Carbon dots, fluorescence, sesame seeds, microwave pyrolysis, metal ions, quenching.CARBON DOTS (C.dots) are gaining increasing attention within the carbon nanomaterial family due to their varied applications in biological, sensing, optical and electrical fields 1-3 . They are swiftly replacing the conventional semiconductor nanoparticles (Q.dots) which have raised serious health and environmental concerns because of the presence of heavy metals in it 4 . C.dots are spherical, oxygenous carbon nanoparticles with size below 10 nm. C.dots akin to Q.dots show several interesting properties such as excitation-dependent emission, chemical and photostability, enhanced fluorescence quantum yields and the possibility of fine-tuning the sensing properties by surface modification [5][6][7][8][9][10][11] In order to improve the photophysical and photochemical properties of C.dots, hetero-atom doped C.dots are synthesized by different ways. Among them, nitrogendoped C.dots received much attention because of their good biocompatibility and the related broad applications in the areas of bio-imaging, electrocatalysis and sensors 25,26 . However, most of the synthesis methods reported so far have either a long reaction time or a need of extra chemicals for doping. Thus, synthesizing Ndoped C.dots in a cost effective and ecofriendly manner and using them for sensing applications, especially for biologically active and environmentally hazardous metal ions will be highly beneficial.Iron is an essential element for many biological processes 27 . The presence of iron in body either at higher levels or at lower levels can lead to several problems which eventually disturbs the lipid metabolism and glucose levels 28 . Therefore, quantitative determination of bioactive iron is an important health care challenge. Some studies have already been reported in this direction; Qian et al. 29 used the N-doped C.dots for detection of Fe(III). Wang et al. 30 used a wide variety of green carbonaceous precursors like milk, silk, honey, hair, lemon, etc. to detect Fe(III).The pre...

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Fabrication of N‐doped Graphene–Carbon Nanotube Hybrids from Prussian Blue for Lithium–Sulfur Batteries

Cortie

Wang

2016

Advanced Energy Materials

325

159

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Hybrid nanostructures containing 1D carbon nanotubes and 2D graphene sheets have many promising applications due to their unique physical and chemical properties. In this study, the authors find Prussian blue (dehydrated sodium ferrocyanide) can be converted to N‐doped graphene–carbon nanotube hybrid materials through a simple one‐step pyrolysis process. Through field emission scanning electron microscopy, transmission electron microscopy, X‐ray diffraction, Raman spectra, atomic force microscopy, and isothermal analyses, the authors identify that 2D graphene and 1D carbon nanotubes are bonded seamlessly during the growth stage. When used as the sulfur scaffold for lithium–sulfur batteries, it demonstrates outstanding electrochemical performance, including a high reversible capacity (1221 mA h g−1 at 0.2 C rate), excellent rate capability (458 and 220 mA h g−1 at 5 and 10 C rates, respectively), and excellent cycling stability (321 and 164 mA h g−1 at 5 and 10 C (1 C = 1673 mA g−1) after 1000 cycles). The enhancement of electrochemical performance can be attributed to the 3D architecture of the hybrid material, in which, additionally, the nitrogen doping generates defects and active sites for improved interfacial adsorption. Furthermore, the nitrogen doping enables the effective trapping of lithium polysulfides on electroactive sites within the cathode, leading to a much‐improved cycling performance. Therefore, the hybrid material functions as a redox shuttle to catenate and bind polysulfides, and convert them to insoluble lithium sulfide during reduction. The strategy reported in this paper could open a new avenue for low cost synthesis of N‐doped graphene–carbon nanotube hybrid materials for high performance lithium–sulfur batteries.

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Facile synthesis and optical properties of nitrogen-doped carbon dots

Cited by 84 publications

References 44 publications

Characterization and Analytical Separation of Fluorescent Carbon Nanodots

Characterization and Analytical Separation of Fluorescent Carbon Nanodots

One-Step Microwave-Assisted Green Synthesis of Luminescent N-Doped Carbon Dots from Sesame Seeds for Selective Sensing of Fe(III)

Fabrication of N‐doped Graphene–Carbon Nanotube Hybrids from Prussian Blue for Lithium–Sulfur Batteries

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