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.

Green and One-Pot Synthesis of Mint Derived Carbon Quantum Dots for Metal Ion Sensing

2021 ◽  
pp. 81-94
Keyword(s):  
Quantum Dots ◽  
Ascorbic Acid ◽  
Metal Ions ◽  
Crystalline Structure ◽  
Metal Ion ◽  
Fluorescence Emission ◽  
Carbon Quantum Dots ◽  
Morphological Properties ◽  
Quenching Effect ◽  
Ion Sensing

A green and simple synthesis of carbon quantum dots (CQDs) was derived from dried mint leaves by hydrothermal method. Crystalline structure of the synthesized CQDs was characterized with X-ray diffraction (XRD) method. The morphological properties of the CQDs were investigated with transmission electron microscopy (TEM). The optical behaviors of the CQDs were examined with fourier transfom infrared spectrophotometer (FT-IR), ultraviolet visible (UV-Vis) and photoluminescence spectrophotometer techniques. Crystalline structure of the CQDs was found as amorphous in nature and the average diameter of the CDs was calculated as 8.13 nm from TEM study. According to the fluorescence emission spectra of the samples, synthesized CQDs was sensitive to mainly Ag(I), Cr(III) and Fe(III) ions. Especially, Ag(I) was the most sensible compared to other metal ions. Quenching effect of the CQDs was also evaluated by using ascorbic acid to metal ions added CQDs samples. Ascorbic acid showed the quenching effect for all the metal ion added samples except Sn(II) ion.

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.

One-step synthesis of chiral carbon quantum dots and their enantioselective recognition

RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 59956-59960 ◽  
Author(s):  
Yalin Zhang ◽  
Lulu Hu ◽  
Yue Sun ◽  
Cheng Zhu ◽  
Rongsheng Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Citric Acid ◽  
Hydrothermal Treatment ◽  
Carbon Quantum Dots ◽  
Enantioselective Recognition ◽  
Chiral Carbon ◽  
One Step

Chiral carbon quantum dots (l-carbon quantum dots, l-CQDs; and d-carbon quantum dots, d-CQDs) were synthesized through the facile hydrothermal treatment of carbonated citric acid and l-cysteine (or d-cysteine).

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.

scholarly journals Polyethylene Glycol6000/carbon Nanodots as Fluorescent Bioimaging Agents

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 677 ◽  
Author(s):  
Chun-Chieh Fu ◽  
Chun-Yung Wu ◽  
Chih-Ching Chien ◽  
Tai-Hao Hsu ◽  
Shih-Fu Ou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Carbon Nanodots ◽  
Gram Negative Bacteria ◽  
Fluorescent Properties ◽  
Gram Positive ◽  
Gram Negative ◽  
Different Types ◽  
Living Organisms ◽  
Surface Modified

Photoluminescent nanomaterials have immense potential for use in biological systems due to their excellent fluorescent properties and small size. Traditional semiconductor quantum dots are heavy-metal-based and can be highly toxic to living organisms, besides their poor photostability and low biocompatibility. Nano-sized carbon quantum dots and their surface-modified counterparts have shown improved characteristics for imaging purposes. We used 1,3, 6-trinitropyrene (TNP) and polyethylene glycol6000 (PEG6000) in a hydrothermal method to prepare functional polyethylene glycol6000/carbon nanodots (PEG6000/CDs) and analyzed their potential in fluorescent staining of different types of bacteria. Our results demonstrated that PEG6000/CDs stained the cell pole and septa of gram-positive bacteria B. Subtilis and B. thuringiensis but not those of gram-negative bacteria. The optimal concentration of these composite nanodots was approximately 100 ppm and exposure times varied across different bacteria. The PEG6000/CD composite had better photostability and higher resistance to photobleaching than the commercially available FM4-64. They could emit two wavelengths (red and green) when exposed to two different wavelengths. Therefore, they may be applicable as bioimaging molecules. They can also be used for differentiating different types of bacteria owing to their ability to differentially stain gram-positive and gram-negative bacteria.

Preparation of nitrogen-doped carbon quantum dots and its application as a fluorescent probe for Cr(vi) ion detection

2019 ◽  
Vol 43 (14) ◽  
pp. 5488-5494 ◽  
Author(s):  
Xiaomin Luo ◽  
Pengxia Bai ◽  
Xuechuan Wang ◽  
Guohui Zhao ◽  
Jianyan Feng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescent Probe ◽  
Hydrothermal Treatment ◽  
Carbon Quantum Dots ◽  
Synthetic Method ◽  
Ion Detection ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

A facile synthetic method was used to prepare N-CQDs via the hydrothermal treatment of gelatin.

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.

Sign in / Sign up

Export Citation Format

Share Document