Journal ArticleDOI
Facile synthesis of sulfur-doped graphene quantum dots as fluorescent sensing probes for Ag+ ions detection
TLDR
Sulfur-doped graphene quantum dots (S-GQDs) with bright blue emission have been prepared by a facile one-pot hydrothermal treatment as mentioned in this paper.Abstract:
Sulfur-doped graphene quantum dots (S-GQDs) with bright blue emission have been prepared by a facile one-pot hydrothermal treatment. A specific compound, 1,3,6-trinitropyrene, which has a mother nucleus structure similar with graphene, was chosen as the carbon source and 3-mercaptopropionic acid (MPA) was employed for S-doping and carboxyl groups modification. The synthesized S-GQDs were characterized by atomic force microscopy (AFM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and fluoscence (FL) spectrum. Results indicated that S-GQDs possessed single layer graphene structure with mean size of about 2.5 nm and presented an excitation-independent photoluminescence behavior with maximum excitation/emission wavelength at 360/450 nm, respectively. The sulfur-doping of GODs drastically improved their electronic and chemical properties, which afforded the S-GQDs a sensitive response to Ag + ions. Furthermore, the S-GQDs were successfully explored as a sensing probe for Ag + detection with high sensitivity and selectivity. A wide linear range of 0.1-130.0 μM with a low detection limit of 30 nM was obtained. The facile preparation method and the high performace of the as-prepared S-GQDs present promising potential for their applications in sensing, biological imaging and catalysis.read more
Citations
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Carbon dots: synthesis, formation mechanism, fluorescence origin and sensing applications
TL;DR: Carbon dots have received an increasing amount of attention because of their significant advantages in terms of low toxicity, chemical inertness, tunable fluorescence, good water solubility, and physicochemical properties as mentioned in this paper.
Journal ArticleDOI
Recent Advances on Graphene Quantum Dots: From Chemistry and Physics to Applications
TL;DR: The differences between G QDs and other nanomaterials, including their nanocarbon cousins, are emphasized, and the unique advantages of GQDs for specific applications are highlighted.
Journal ArticleDOI
Flexible Graphene-Based Wearable Gas and Chemical Sensors
TL;DR: The role of graphene in fabricating flexible gas sensors for the detection of various hazardous gases, including nitrogen dioxide, ammonia, hydrogen, hydrogen sulfide, carbon dioxide, sulfur dioxide, and humidity in wearable technology, is discussed.
Journal ArticleDOI
A review on graphene-based nanocomposites for electrochemical and fluorescent biosensors
TL;DR: Graphene and its oxygenated derivatives, including reduced graphene oxide (rGO), are becoming an important class of nanomaterials in the field of biosensors as discussed by the authors, and the discovery of graphene has spectacularly accelerated research on fabricating low-cost electrode materials because of its unique physical properties, including high specific surface area, high carrier mobility, high electrical conductivity, flexibility.
Journal ArticleDOI
Heteroatom doped graphene engineering for energy storage and conversion
Rajesh Kumar,Sumanta Sahoo,Ednan Joanni,Rajesh Kumar Singh,Keiichiro Maegawa,Wai Kian Tan,Go Kawamura,Kamal K. Kar,Atsunori Matsuda +8 more
TL;DR: In this article, the most recent research works on the synthesis of heteroatom-doped graphene materials such as reduced graphene oxide, graphene oxide and graphene nanoribbons are surveyed.
References
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Journal ArticleDOI
An Electrochemical Avenue to Green-Luminescent Graphene Quantum Dots as Potential Electron-Acceptors for Photovoltaics
TL;DR: To facilitate the application of graphene in nanodevices and to effectively tune the bandgap of graphenes, a promising approach is to convert the 2D graphene sheets into 0D graphene quantum dots (GQDs).
Journal ArticleDOI
Chemical doping of graphene
Hongtao Liu,Yunqi Liu,Daoben Zhu +2 more
TL;DR: In this paper, a summary of chemical doping of graphene aimed at tuning the electronic properties of graphene is presented, which will be beneficial to designing high performance electronic devices based on chemically doped graphene.
Journal ArticleDOI
Heteroatom-doped graphene materials: syntheses, properties and applications
TL;DR: The distinct properties resulting from various dopants, different doping levels and configurations, and synergistic effects from co-dopants are emphasized, hoping to assist a better understanding of doped graphene materials.
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Bioaccumulation and toxicity of silver compounds: A review
TL;DR: In this paper, a view of the literature revealed that bioaccumulation of silver in soil is rather low, even if the soil is amended with silver-containing sewage sludge.
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Upconversion and downconversion fluorescent graphene quantum dots: ultrasonic preparation and photocatalysis.
TL;DR: A facile ultrasonic route for the fabrication of graphene quantum dots (GQDs) with upconverted emission is presented, and it is interesting that the photocatalytic rate of the rutile TiO(2)/GQD complex system is ca.
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