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.

Synthesis and characterization of highly luminescent N-doped carbon quantum dots for metal ion sensing

2018 ◽  
Vol 186 (1) ◽  
pp. 32-39 ◽  
Author(s):  
Sarita Devi ◽  
Amanjot Kaur ◽  
Sudipta Sarkar ◽  
Sujata Vohra ◽  
Sachin Tyagi
Keyword(s):  
Quantum Dots ◽  
Metal Ion ◽  
Carbon Quantum Dots ◽  
Synthesis And Characterization ◽  
Ion Sensing ◽  
Metal Ion Sensing

Carbon quantum dots/block copolymer ensembles for metal-ion sensing and bioimaging

2017 ◽  
Vol 5 (27) ◽  
pp. 5397-5402 ◽  
Author(s):  
T. Skaltsas ◽  
M. Goulielmaki ◽  
A. Pintzas ◽  
S. Pispas ◽  
N. Tagmatarchis
Keyword(s):  
Quantum Dots ◽  
Block Copolymer ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Metal Ion ◽  
Carbon Quantum Dots ◽  
Ion Sensing ◽  
Metal Ion Sensing

Carbon quantum dots/block copolymer/bovine serum albumin nanoensembles for metal ion sensing and bioimaging.

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.

scholarly journals Biomass-derived Carbon Quantum Dots for Visible-Light-Induced Photocatalysis and Label-Free Detection of Fe(III) and Ascorbic acid

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Gouri Sankar Das ◽  
Jong Pil Shim ◽  
Amit Bhatnagar ◽  
Kumud Malika Tripathi ◽  
TaeYoung Kim
Keyword(s):  
Quantum Dots ◽  
Ascorbic Acid ◽  
Visible Light ◽  
Fluorescence Emission ◽  
Carbon Quantum Dots ◽  
Active Species ◽  
Label Free ◽  
One Pot ◽  
Label Free Detection ◽  
Visible Light Driven

Abstract Visible-light-driven photocatalysts prepared using renewable resources are crucial but challenging to develop for the efficient degradation of organic pollutants, which is required to solve ever-increasing water deterioration issues. In this study, we report a visible-light-responsive photocatalyst for the efficient degradation of methylene blue (MB) as a model pollutant dye. Green-emissive carbon quantum dots (CQDs) were synthesized from pear juice via a facile, scalable, one-pot solvothermal process. The as-synthesized CQDs exhibit superior photocatalytic activity under visible-light irradiation owing to their efficient light absorption, electron transfer, and separation of photogenerated charge carriers, facilitating ~99.5% degradation of MB within 130 min. A possible mechanism for the photocatalysis is proposed on the basis of comprehensive active species trapping experiments. Furthermore, the CQDs were used in a specific sensitive assay for Fe(III) and ascorbic acid (AA), even with interference from other metal ions. The fluorescence emission of CQDs was “turned off” specifically upon binding of Fe(III) and “turned on” with AA. The prepared CQDs represent efficient photocatalysts and fluorescent probes that are not restricted by toxicity, cost, or lack of scalability.

Carbon quantum dot-based nanoprobes for metal ion detection

2016 ◽  
Vol 4 (29) ◽  
pp. 6927-6945 ◽  
Author(s):  
Xiaohui Gao ◽  
Cheng Du ◽  
Zhihua Zhuang ◽  
Wei Chen
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Quantum Dot ◽  
Metal Ion ◽  
Carbon Quantum Dots ◽  
Ion Detection ◽  
Carbon Quantum Dot ◽  
Ion Sensing ◽  
Metal Ion Sensing ◽  
Metal Ion Detection

This review highlights the synthesis and optical properties of carbon quantum dots and their application in metal ion sensing.

Dumbbell-shaped carbon quantum dots/AuNCs nanohybrid as an efficient ratiometric fluorescent probe for sensing cadmium (II) ions and l-ascorbic acid

Carbon ◽  
2016 ◽  
Vol 96 ◽  
pp. 1034-1042 ◽  
Author(s):  
Wen-Jun Niu ◽  
Dan Shan ◽  
Rong-Hui Zhu ◽  
Sheng-Yuan Deng ◽  
Serge Cosnier ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ascorbic Acid ◽  
Fluorescent Probe ◽  
Carbon Quantum Dots ◽  
Ratiometric Fluorescent Probe

scholarly journals Top-Down N-Doped Carbon Quantum Dots for Multiple Purposes: Heavy Metal Detection and Intracellular Fluorescence

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2249
Author(s):  
Francesca Limosani ◽  
Elvira Maria Bauer ◽  
Daniele Cecchetti ◽  
Stefano Biagioni ◽  
Viviana Orlando ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Metal Ion ◽  
Reaction Times ◽  
Size Control ◽  
Carbon Quantum Dots ◽  
Cell Nuclei ◽  
Top Down ◽  
Hek 293 ◽  
Metal Ion Detection ◽  
Intracellular Fluorescence

In the present study, we successfully synthesized N-doped carbon quantum dots (N-CQDs) using a top-down approach, i.e., hydroxyl radical opening of fullerene with hydrogen peroxide, in basic ambient using ammonia for two different reaction times. The ensuing characterization via dynamic light scattering, SEM, and IR spectroscopy revealed a size control that was dependent on the reaction time, as well as a more pronounced -NH2 functionalization. The N-CQDs were probed for metal ion detection in aqueous solutions and during bioimaging and displayed a Cr3+ and Cu2+ selectivity shift at a higher degree of -NH2 functionalization, as well as HEK-293 cell nuclei marking.

FRET Study Between Carbon Quantum Dots and Malachite Green by Steady-State and Time-Resolved Fluorescence Spectroscopy

2020 ◽  
Vol 10 (3) ◽  
pp. 178-188
Author(s):  
Bipin Rooj ◽  
Ankita Dutta ◽  
Debojyoti Mukherjee ◽  
Sahidul Islam ◽  
Ujjwal Mandal
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Fluorescence Spectroscopy ◽  
Malachite Green ◽  
Dye Degradation ◽  
Fluorescence Emission ◽  
Carbon Quantum Dots ◽  
Time Resolved Fluorescence ◽  
Physical Processes ◽  
Time Resolved

Background: Understanding the interaction between different organic dyes and carbon quantum dots helps us to understand several photo physical processes like electron transfer, energy transfer, molecular sensing, drug delivery and dye degradation processes etc. Objective: The primary objective of this study is to whether the carbon quantum dots can act as an electron donor and can participate in the different photo physical processes. Methods: In this work, Carbon Quantum Dots (CQDLs) are synthesized in most economical and simple carbonization method where petals of Nelumbo nucifera L. are used as a carbon precursor. The synthesized CQDLs were characterized by using experimental techniques like UV−Vis absorption, FT-IR, Transmission Electron Microscopy (TEM), steadystate and time-resolved fluorescence spectroscopy. Results: The spectral analysis shows that the so synthesized CQDLs are spherical in shape and its diameter is around 4.2 nm. It shows the fluorescence emission maximum at 495 nm with a quantum yield of 4%. In this work the interaction between Carbon Quantum Dots (CQDLs) and an organic dye Malachite Green (MG) is studied using fluorescence spectroscopic technique under ambient pH condition (At pH 7). The quenching mechanism of CQDLs with MG was investigated using Stern-Volmer equation and time-resolved fluorescence lifetime studies. The results show that the dominant process of fluorescence quenching is attributed to Forster Resonance Energy Transfer (FRET) having a donor acceptor distance of 53 Å where CQDLs act as a donor and MG acts as an acceptor. Conclusion: This work has a consequence that CQDLs can be used as a donor species for different photo physical processes such as photovoltaic cell, dye sensitized solar cell, and also for antioxidant activity study.

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