Fluorescent carbon dots and their sensing applications

Sun, Xiangcheng; Lei, Yu

doi:10.1016/j.trac.2017.02.001

Cited by 618 publications

(294 citation statements)

References 134 publications

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“…2,3 Specifically, C-dots exhibit broad excitation-dependent fluorescence emissions (for example, multiple colors), bright luminescence and low photobleaching, which are beneficial for sensing applications. [4][5][6] In particular, C-dots constitute a useful analytical platform because of their biocompatibility and potentially lower cytotoxicity compared with conventional semiconductor quantum dots (QDs). 1 Moreover, C-dots can be synthesized from diverse inexpensive and readily available reagents through simple procedures, enabling straightforward modulation of their structural properties.…”

Section: Introductionmentioning

confidence: 99%

“…4,7 Importantly, the fluorescence properties of C-dots are highly sensitive to their environments, and this feature has provided opportunities for various sensing applications. 6,8 C-dot-based sensors have several advantages: (1) they exhibit high sensitivity toward various targets; (2) the sensing method is usually simple and free of reagents; and (3) the change in their fluorescence signal is very fast, which enables a very short response time. [9][10][11][12] Porous silicon (PSi) and oxidized PSi (PSiO 2 ) have emerged in recent years as attractive and versatile nanomaterials for sensing applications.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of a nanostructured porous silicon/carbon dot-hybrid for orthogonal molecular detection

et al. 2018

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A new hybrid guest-host material consisting of a Fabry-Pérot porous silicon (PSi) thin film, a nanostructured high surface-area matrix, and encapsulated fluorescent carbon quantum dots (C-dots) is described. The hybrid is synthesized by a facile in situ pyrolysis treatment of the carbonaceous precursor incorporated within the nanoscale pores of the inorganic host. The effects of nanoconfinement on the integrity of the C-dots and their optical properties are characterized. We show that the resulting hybrid allows for label-free optical detection of target molecules using two orthogonal modalities, that is, the white-light reflectivity of the PSi matrix and the fluorescence of the confined C-dots, and these two signals can be observed and collected simultaneously. The resulting hybrid system exhibits superior sensing performance in comparison with that of the individual components. Notably, we demonstrate that the confined C-dots exhibit greater sensitivity toward various analytes as well as an improved linear response, thus providing evidence of the impact of the host nanoscale porous scaffold on the optical properties of the C-dots. Moreover, we show that this orthogonal detection scheme increases the dynamic range of the sensor and minimizes falsenegative results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a nanostructured porous silicon/carbon dot-hybrid for orthogonal molecular detection

et al. 2018

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“…CQDs share the features of semiconductor QDs, such as good photostability and water solubility, and have the added advantages that semiconductor QDs do not have, such as chemical stability, biocompatibility, and low toxicity, which allow them to be used as a replacement for semiconductor QDs . Indeed, the simplicity of synthesis and the unique properties of CQDs have attracted considerable attention and found many applications, especially in the design and development of various PL sensors …”

Section: Introductionmentioning

confidence: 99%

A carbon quantum dots‐enhanced chemiluminescence method for the determination of gallic acid in food samples

Chen

Zhang

Han

et al. 2018

J Chinese Chemical Soc

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In this work, we show that gallic acid can significantly inhibit the chemiluminescence (CL) intensity of carbon quantum dots (CQDs)‐enhanced K3Fe(CN)6–luminol system. Under optimum conditions, the decrease in the CL intensity is proportional to the concentration of gallic acid over the range 0.01–1.0 μM, and the detection limit is 1.0 nM. The relative standard deviation of repeated intraday and interday determinations of gallic acid was 1.2–4.2%. This method was successfully applied to the determination of gallic acid in food samples, with recoveries in the range 94.0–103.0%. A possible mechanism of CL is discussed.

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“…Quantum dots (QDs) have shown an important role in solar photovoltaic (PV), photocatalysts, photosensors and other optoelectronic components due to its quantum confinement effect, small particle size, large specific surface area and high catalytic activity . QDs can capture and transfer photogenerated electrons, accelerating the separation efficiency of photo‐induced carriers.…”

Section: Introductionmentioning

confidence: 99%

WO₃ Quantum Dots Decorated GO/Mg‐doped ZnO Composites for Enhanced Photocatalytic Activity under Nature Sunlight

Zhao

Fang

Chen

et al. 2018

Applied Organom Chemis

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Graphene oxide/Mg‐doped ZnO/tungsten oxide quantum dots composites (WQGOMZ) were prepared through co‐precipitation method, and were studied by X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray photoelectron spectroscopy (XPS), Fluorescence spectra (FL), and UV–vis diffuse reflection spectra. Furthermore, the photocatalytic activity of resultant WQGOMZ was evaluated under nature sunlight. Experimental results showed that WO3QDs can remarkably heighten the photocatalytic activity of GOMZ composite, in which is nearly 6.58 times higher than that of GOMZ composite. Simultaneously, WQGOMZ composites possess optical memory ability and maintain high photocatalytic stability for more than 40 days. The enhanced photocatalytic activity and optical memory ability are attributed to the effective synergistic effect between ZnO and WO3QDs.

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Fluorescent carbon dots and their sensing applications

Cited by 618 publications

References 134 publications

Synthesis and characterization of a nanostructured porous silicon/carbon dot-hybrid for orthogonal molecular detection

Synthesis and characterization of a nanostructured porous silicon/carbon dot-hybrid for orthogonal molecular detection

A carbon quantum dots‐enhanced chemiluminescence method for the determination of gallic acid in food samples

WO₃ Quantum Dots Decorated GO/Mg‐doped ZnO Composites for Enhanced Photocatalytic Activity under Nature Sunlight

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Fluorescent carbon dots and their sensing applications

Cited by 618 publications

References 134 publications

Synthesis and characterization of a nanostructured porous silicon/carbon dot-hybrid for orthogonal molecular detection

Synthesis and characterization of a nanostructured porous silicon/carbon dot-hybrid for orthogonal molecular detection

A carbon quantum dots‐enhanced chemiluminescence method for the determination of gallic acid in food samples

WO3 Quantum Dots Decorated GO/Mg‐doped ZnO Composites for Enhanced Photocatalytic Activity under Nature Sunlight

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WO₃ Quantum Dots Decorated GO/Mg‐doped ZnO Composites for Enhanced Photocatalytic Activity under Nature Sunlight