Carbon Based Dots and Their Luminescent Properties and Analytical Applications

Dong, Yongqiang; Jian-Hua, Cai; Chi, Yuwu

doi:10.1007/978-3-319-28782-9_6

Cited by 10 publications

(5 citation statements)

References 264 publications

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“…HRTEM analysis (Fig. 6b) confirms the graphitic core nature of the obtained N-CDs with an interplanar distance of 0.27 nm, which agrees well with previous reports [42][43][44] .…”

Section: Morphology and Composition Of N-cds The Surface Morphology supporting

confidence: 90%

Fluorescent recognition of Fe3+ in acidic environment by enhanced-quantum yield N-doped carbon dots: optimization of variables using central composite design

Issa

Abidin

Sobri

et al. 2020

Sci Rep

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A versatile synthetic approach for development of highly fluorescent nitrogen-doped carbon dots (n-cDs) from carboxymethylcellulose in the presence of linear polyethyleneimine (Lpei) has been developed. According to single factor method, central composite design incorporated with response surface methodology matrix was applied to find and model optimal conditions for the temperature (220-260 °C), duration (1-3 h) and LPEI weight (0.5-1.5%). The statistical results show that duration was the most significant parameter for efficient carbonization conversion rate in comparison with temperature and Lpei weight. the reduced cubic model (R 2 = 0.9993) shows a good correlation between the experimental data and predicted values. the optimal variables were temperature of 260 °C, duration of 2 h and LPEI weight of 1%. Under these conditions, quantum yield of up to 44% was obtained. The numerically optimized N-CDs have an average size of 3.4 nm with graphitic nature owing to the abundant amino species incorporated into the carbon core framework. the blue-green n-cDs possess emission dependent upon the solvent polarity, wide pH stability with enhanced emission in an acidic environment. Impressively, the N-CDs show long-shelf-life for up to 1 year with no noticeable precipitation. the n-cDs were able to recognize a high concentration of fe 3+ ions with a detection limit of 0.14 μM in acidic solution owing to the special coordination for Fe 3+ to be captured by electron-donating oxygen/ amino groups around n-cDs. Moreover, the n-cDs can also be used as a new kind of fluorescent ink for imaging applications. Carbon dots (CDs) are the latest member of fluorescent carbon nano-sized family. Typically, CDs are nearly spherical-shaped nanoclusters with sizes of less than 10 nm and consist of amorphous or crystalline cores with sp 2 carbon atoms 1. Since the first established work 2 , CDs have attracted a considerable focusing in the fields of wastewater treatment, photocatalysis, bioimaging, cancer therapy and chemical sensing 3,4. This is owing to their feature of having outstanding optical properties, including excellent biocompatibility, tuneable photoluminescence, negligible toxicity, ease of production and resistance to photobleaching in comparison to QDs counterparts 5-7. It is well known that QDs, for instance, tend to be decayed in the biological environment leading to a serious toxicity concern 8 .

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“…HRTEM analysis (Fig. 6b) confirms the graphitic core nature of the obtained N-CDs with an interplanar distance of 0.27 nm, which agrees well with previous reports [42][43][44] .…”

Section: Morphology and Composition Of N-cds The Surface Morphology supporting

confidence: 90%

Fluorescent recognition of Fe3+ in acidic environment by enhanced-quantum yield N-doped carbon dots: optimization of variables using central composite design

Issa

Abidin

Sobri

et al. 2020

Sci Rep

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“…The QY was found to be 80%, which means that on exciting the colloidal solution of CDs with 360 nm wavelength out of hundred particles, 80 particles emit photons, which is quite high for the CDs synthesized till present. It is well known that the surface passivation increases the fluorescence. − The high QY of the prepared CDs shows that CDs mainly consist of a carbogenic core with COOH, OH, NH 2 and SH as the surface passivating agent . This increase in fluorescence compared to other methods may be because of capping with N and S as well as because of the formation of fluorescent organic species of IPCA. , Moreover, microwave-synthesized CDs create more surface defects, resulting in increased fluorescence.…”

Section: Resultsmentioning

confidence: 98%

“…57−59 The high QY of the prepared CDs shows that CDs mainly consist of a carbogenic core with COOH, OH, NH 2 and SH as the surface passivating agent. 60 This increase in fluorescence compared to other methods may be because of capping with N and S as well as because of the formation of fluorescent organic species of IPCA. 21,24 Moreover, microwave-synthesized CDs create more surface defects, resulting in increased fluorescence.…”

Section: Acs Applied Materials and Interfacesmentioning

confidence: 99%

Highly Biocompatible, Fluorescence, and Zwitterionic Carbon Dots as a Novel Approach for Bioimaging Applications in Cancerous Cells

Sri

Kumar

Panda

et al. 2018

ACS Appl. Mater. Interfaces

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Highly biocompatible, excellently photostable, nitrogen- and sulfur-containing novel zwitterionic carbon dots (CDs) were synthesized by microwave-assisted pyrolysis. The size of CDs were 2–5 nm, with an average size of 2.61 ± 0.7 nm. CDs were characterized by UV/vis spectroscopy, fluorescence spectroscopy, zeta potential, Fourier-transform infrared spectroscopy, X-ray diffraction, and time-resolved fluorescence spectroscopy. CDs were known to emit blue fluorescence when excited at 360 nm, that is, UV region, and emit in the blue region of visible spectrum, that is, at 443 nm. CDs showed excitation-independent photoluminescence behavior and were highly fluorescent even at lower concentration under UV light. These CDs were highly fluorescent in nature, with the quantum yield being as high as 80%, which is comparable to that of organic dyes. The CDs were further used to image two different oral cancer cell lines, namely, FaDu (human pharyngeal carcinoma) and Cal-27 (human tongue carcinoma). The cell viability assay demonstarted that CDs were highly biocompatible, which was further confirmed by the side scattering studies as no change in the granularity was observed even at the highest concentration of 1600 μg/mL. The generation of reactive oxygen species (ROS) was also investigated and negligible generaton of ROS was detected. In addition to that, the uptake phenomenon, cell cycle analysis, exocytosis, and cellular uptake at 4 °C and in the presence of ATP inhibitor were studied. It was found that CDs easily cross the plasma membrane without hampering the cellular integrity.

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“…The most distinguishable fluorescent characteristic of carbon dots is their excitation-dependent emission. As the excitation moves across from UV to near-infrared, the carbon dots emission shifts in correspondence with the excitation wavelength [ 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 ]. Some carbon dots have a stabilized emission peak even with a shifting excitation wavelength, while some carbon dots possess upconversion fluorescence when excited by near-infrared light [ 87 , 88 , 89 ].…”

Section: Fluorescence-emitting/interacting Nanomaterialsmentioning

confidence: 99%

Fluorescent Nanobiosensors for Sensing Glucose

Chen

Hwang

Zhang

2018

Sensors

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Glucose sensing in diabetes diagnosis and therapy is of great importance due to the prevalence of diabetes in the world. Furthermore, glucose sensing is also critical in the food and drug industries. Sensing glucose has been accomplished through various strategies, such as electrochemical or optical methods. Novel transducers made with nanomaterials that integrate fluorescent techniques have allowed for the development of advanced glucose sensors with superior sensitivity and convenience. In this review, glucose sensing by fluorescent nanobiosensor systems is discussed. Firstly, typical fluorescence emitting/interacting nanomaterials utilized in various glucose assays are discussed. Secondly, strategies for integrating fluorescent nanomaterials and biological sensing elements are reviewed and discussed. In summary, this review highlights the applicability of fluorescent nanomaterials, which makes them ideal for glucose sensing. Insight on the future direction of fluorescent nanobiosensor systems is also provided.

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Carbon Based Dots and Their Luminescent Properties and Analytical Applications

Cited by 10 publications

References 264 publications

Fluorescent recognition of Fe3+ in acidic environment by enhanced-quantum yield N-doped carbon dots: optimization of variables using central composite design

Fluorescent recognition of Fe3+ in acidic environment by enhanced-quantum yield N-doped carbon dots: optimization of variables using central composite design

Highly Biocompatible, Fluorescence, and Zwitterionic Carbon Dots as a Novel Approach for Bioimaging Applications in Cancerous Cells

Fluorescent Nanobiosensors for Sensing Glucose

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