scholarly journals Fabrication of HA/PEI-functionalized carbon dots for tumor targeting, intracellular imaging and gene delivery

RSC Advances ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 3369-3375 ◽  
Author(s):  
M. Zhang ◽  
X. Zhao ◽  
Z. Fang ◽  
Y. Niu ◽  
J. Lou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Gene Delivery ◽  
Carbon Dots ◽  
Tumor Targeting ◽  
Carbon Quantum Dots ◽  
Nano Materials ◽  
Intracellular Imaging ◽  
Biomedical Fields

Carbon quantum dots (CDs) as emerging carbon nano-materials have attracted tremendous attention in biomedical fields due to unique properties.

A green synthetic route for the surface-passivation of carbon dots as an effective multifunctional fluorescent sensor for the recognition and detection of toxic metal ions from aqueous solution

2019 ◽  
Vol 11 (4) ◽  
pp. 490-506 ◽  
Author(s):  
K. Radhakrishnan ◽  
P. Panneerselvam ◽  
M. Marieeswaran
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Carbon Dots ◽  
Surface Passivation ◽  
Fluorescent Sensor ◽  
Toxic Metal ◽  
Carbon Quantum Dots ◽  
Synthetic Route ◽  
One Pot ◽  
Hydrothermal Methods

In this work, a green synthetic route was used to create a number of surface passivated fluorescent carbon quantum dots, which are explored as promising sensing probes, via facile one-pot hydrothermal methods.

An “on–off–on” fluorescent nanoprobe for recognition of Cu2+ and GSH based on nitrogen co-doped carbon quantum dots, and its logic gate operation

2019 ◽  
Vol 11 (20) ◽  
pp. 2650-2657 ◽  
Author(s):  
Yifang Gao ◽  
Huilin Zhang ◽  
Shaomin Shuang ◽  
Hui Han ◽  
Chuan Dong
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Logic Gate ◽  
Carbon Quantum Dots ◽  
Gate Operation ◽  
Fluorescent Nanoprobe ◽  
Highly Sensitive ◽  
Doped Carbon Dots ◽  
Co Doped

Novel nitrogen co-doped carbon dots (NCDs) were synthesized as a fluorescent “on–off–on” switch for the highly sensitive and selective sensing of Cu2+ and glutathione (GSH) by a straightforward pyrolysis route.

scholarly journals Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 67 ◽  
Author(s):  
Li Xu ◽  
Yushu Zhang ◽  
Haiqing Pan ◽  
Nan Xu ◽  
Changtong Mei ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Water Resistance ◽  
Cellulose Nanofibers ◽  
Tensile Modulus ◽  
Radiata Pine ◽  
Carbon Quantum Dots ◽  
Nanocomposite Films ◽  
Excitation Wavelength ◽  
Nano Materials ◽  
Nano Composite

In this study, the low-cost processing residue of Radiata pine (Pinus radiata D. Don) was used as the lone carbon source for synthesis of CQDs (Carbon quantum dots) with a QY (The quantum yield of the CQDs) of 1.60%. The CQDs were obtained by the hydrothermal method, and +a PVA-based biofilm was prepared by the fluidized drying method. The effects of CQDs and CNF (cellulose nanofibers) content on the morphology, optical, mechanical, water-resistance, and wettability properties of the PVA/CQDs and PVA/CNF/CQDs films are discussed. The results revealed that, when the excitation wavelength was increased from 340 to 390 nm, the emission peak became slightly red-shifted, which was induced by the condensation between CQDs and PVA. The PVA composite films showed an increase in fluorescence intensity with the addition of the CNF and CQDs to polymers. The chemical structure of prepared films was determined by the FTIR spectroscopy, and no new chemical bonds were formed. In addition, the UV transmittance was inversely proportional to the change of CQDs content, which indicated that CQDs improved the UV barrier properties of the films. Furthermore, embedding CQDs Nano-materials and CNF into the PVA matrix improved the mechanical behavior of the Nano-composite. Tensile modulus and strength at break increased significantly with increasing the concentration of CQDs Nano-materials inside the Nano-composite, which was due to the increased in the density of crosslinking behavior. With the increase of CQDs content (>1 mL), the water absorption and surface contact angle of the prepared films decreased gradually, and the water-resistance and surface wettability of the films were improved. Therefore, PVA/CNF/CQDs bio-nanocomposite films could be used to prepare anti-counterfeiting, high-transparency, and ultraviolet-resistant composites, which have potential applications in ecological packaging materials.

scholarly journals Carbon Dots for Sensing and Killing Microorganisms

2019 ◽  
Vol 5 (2) ◽  
pp. 33 ◽  
Author(s):  
Fengming Lin ◽  
Yan-Wen Bao ◽  
Fu-Gen Wu
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Carbon Nanoparticles ◽  
Surface Passivation ◽  
Electronic Devices ◽  
Carbon Quantum Dots ◽  
Toxicity Profile ◽  
Carbon Dot ◽  
Underlying Mechanisms

Carbon dots (or carbon quantum dots) are small (less than 10 nm) and luminescent carbon nanoparticles with some form of surface passivation. As an emerging class of nanomaterials, carbon dots have found wide applications in medicine, bioimaging, sensing, electronic devices, and catalysis. In this review, we focus on the recent advancements of carbon dots for sensing and killing microorganisms, including bacteria, fungi, and viruses. Synthesis, functionalization, and a toxicity profile of these carbon dots are presented. We also discuss the underlying mechanisms of carbon dot-based sensing and killing of microorganisms.

Carbon quantum dots and carbon layer double protected cuprous oxide for efficient visible light CO2 reduction

2019 ◽  
Vol 55 (30) ◽  
pp. 4419-4422 ◽  
Author(s):  
Haitao Li ◽  
Yadan Deng ◽  
Youdi Liu ◽  
Xin Zeng ◽  
Dianne Wiley ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Cuprous Oxide ◽  
Carbon Dots ◽  
Co2 Reduction ◽  
Carbon Quantum Dots ◽  
Carbon Layer ◽  
Excellent Performance

We designed a photocatalyst of carbon dots and carbon layer double-protected Cu2O which exhibited excellent performance in CO2 conversion.

scholarly journals Antiviral Carbon Dots: High Amplification of the Antiviral Activity of Curcumin through Transformation into Carbon Quantum Dots (Small 41/2019)

Small ◽  
2019 ◽  
Vol 15 (41) ◽  
pp. 1970219
Author(s):  
Chin‐Jung Lin ◽  
Lung Chang ◽  
Han‐Wei Chu ◽  
Han‐Jia Lin ◽  
Pei‐Ching Chang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Antiviral Activity ◽  
Carbon Dots ◽  
Carbon Quantum Dots

Lowering the detection limit towards nanomolar mercury ion detection via surface modification of N-doped carbon quantum dots

2019 ◽  
Vol 43 (22) ◽  
pp. 8677-8683 ◽  
Author(s):  
Kosar Hikmat Hama Aziz ◽  
Khalid M. Omer ◽  
Rebaz Fayaq Hamarawf
Keyword(s):  
Analytical Chemistry ◽  
Quantum Dots ◽  
Surface Modification ◽  
Detection Limit ◽  
Environmental Analysis ◽  
Trace Analysis ◽  
Carbon Dots ◽  
Carbon Quantum Dots ◽  
Mercury Ion ◽  
Mercury Ion Detection

Surface modification of carbon dots can lower the detection limit of trace analysis which is challenging in analytical chemistry and environmental analysis.

Green Carbon Dots for Metal Sensing

2019 ◽  
Vol 962 ◽  
pp. 36-40
Author(s):  
Lan Ching Sim ◽  
Jia Min Khor ◽  
Kah Hon Leong ◽  
Pichiah Saravanan
Keyword(s):  
Quantum Dots ◽  
Metal Ions ◽  
Hydrothermal Treatment ◽  
Carbon Dots ◽  
Carbon Quantum Dots ◽  
Quenching Effect ◽  
Different Types ◽  
Stock Solutions ◽  
Metal Sensing

In this work, carbon quantum dots (C-dots) was successfully synthesized by hydrothermal treatment using dried leaves as green precursor for metal sensing. The performance of C-dots when detecting metal ions in water will be evaluated by testing with different types of metal stock solutions. Quenching effect of fluorescence C-dots solution was observed in the presence of different metal ions. C-dots is more selective towards Fe3+ compared to other metal ions.

Hydrothermal synthesis of carbon quantum dots as fluorescent probes for the sensitive and rapid detection of picric acid

2018 ◽  
Vol 10 (23) ◽  
pp. 2775-2784 ◽  
Author(s):  
Yingte Wang ◽  
Xiaoyue Chang ◽  
Na Jing ◽  
Yong Zhang
Keyword(s):  
Quantum Dots ◽  
Hydrothermal Synthesis ◽  
Quantum Yield ◽  
Hydrothermal Method ◽  
Fluorescent Probes ◽  
Carbon Dots ◽  
Rapid Detection ◽  
Picric Acid ◽  
Carbon Quantum Dots

Carbon dots synthesized via a hydrothermal method with a quantum yield of 41.4% are used for the detection of picric acid.

A green one-pot synthesis of nitrogen and sulfur co-doped carbon quantum dots for sensitive and selective detection of cephalexin

2017 ◽  
Vol 95 (6) ◽  
pp. 641-648 ◽  
Author(s):  
Farhad Akhgari ◽  
Naser Samadi ◽  
Khalil Farhadi ◽  
Mehrdad Akhgari
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Limit Of Detection ◽  
Carbon Quantum Dots ◽  
Water Soluble ◽  
Soluble Nitrogen ◽  
Selective Detection ◽  
Photoluminescence Intensity ◽  
Doped Carbon Dots ◽  
Co Doped

The article reports a simple, economic, and green method for preparing water-soluble, nitrogen and sulfur co-doped carbon quantum dots via a one-step hydrothermal method. Pomegranate juice served as the carbon source, and the L-cysteine provided nitrogen and sulfur. Co-doped carbon dots were characterized by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy techniques. The co-doped carbon dots served as fluorescent probes for sensitive and selective detection of cephalexin. Briefly, the co-doped carbon dot systems showed quenching of photoluminescence intensity in the presence of cephalexin. The decrease of fluorescence intensity made it possible to analyze cephalexin with satisfactory detection limits and linear ranges. The Sterne–Volmer plot showed a linear relationship (R2 = 0.998) between F0/F and the concentration of cephalexin over the range from 0.3 to 10 μmol L−1. The limit of detection (LOD) was estimated to be 1 × 10−7 mol L−1 (at a signal to noise ratio of 3). To validate the applicability, the described method was successfully applied for the detection of cephalexin in human urine and raw milk samples.

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