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Carbon Quantum Dots - DOAJ

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Last Updated: 28 September 2022

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Hydrothermal Synthesis of Nitrogen-Doped and Excitation-Dependent Carbon Quantum Dots for Selective Detection of Fe 3+ in Blood Plasma

Fluorescent carbon quantum dots, a new fluorescent nanomaterial with unique properties, have attracted intense interest in the last two decades. Despite all the positive outcomes they provide, the manufacture of CQD systems with excitation wavelength-dependent nature and high quantum yield remains a scientific challenge. We recommend the production of CQD using a simple and fast-to-tune hydrothermal process using inexpensive and biocompatible precursors such as urea and lactic acid in this report. In addition, CQDs demonstrated remarkable sensitivity and selectivity in the sensing of Fe 3+ in blood plasma in a linear correlation in the range of 0–u20131000 bcM, demonstrating the high potential of CQDs in practical applications. Given the simple and cost-effective synthetic process, simple-to-tune optical properties, excitation-dependent nature, high fluorescence production, and low cytotoxicity, we strongly believe that N-doped CQDs can have unique advantages in many biomedical fields, including diagnosis, bioimaging, and biosensors.

Source link: https://doi.org/10.3390/coatings12091311


Nanocomposites of Carbon Quantum Dots and Graphene Quantum Dots: Environmental Applications as Sensors

Researchers have been drawn to researchers as sensors thanks to their attractive physico-chemical characteristics due to edge effects and quantum confinement. We've covered the synthesis and application of graphene quantum dots and carbon quantum dots in this review article. As sensors are described in detail, the environmental impact of nanocomposites of CQDs/GQDs and pristine quantum dots is discussed in detail. As sensors are also explored, recent advancements and future perspectives in the use of CQDs, GQDs, and their nanocomposites are also explored.

Source link: https://doi.org/10.3390/chemosensors10090367


Highly Specific Silver Ion Detection by Fluorescent Carbon Quantum Dots

We find that nanometric particles with high specificity for silver cations can be prepared by hydrothermal synthesis starting from citric and folic acid solutions in this article. When comparing Ag+ and the isoelectronic Cd 2+, this remarkable feature was tentatively associated with the greater interactions between silver ion and small portions of the nanomaterial surface.

Source link: https://doi.org/10.3390/chemosensors10090362


Localized Surface Plasmon Resonance Decorated with Carbon Quantum Dots and Triangular Ag Nanoparticles for Chlorophyll Detection

This paper presents carbon quantum dots with triangular silver nanoparticles as the sensing components of localized surface plasmon resonance sensors for chlorophyll determination. In XPS analysis, the appearance of C=O and NH2 at 399. 5 ev and 529. 6 ev indicate that functional groups are present for adsorption sites for chlorophyll interaction. The AgNP-u2013CQD composite was coated on the glass slide surface with triethoxysilane as a coupling agent and served as the active sensing layer for chlorophyll detection. AgNP's linear response detection for AgNPu202121 reveals R 2 = 0. 9581 and a sensitivity of 0. 80 ppm versus 10. 0 ppm, with a detection limit of 0. 2 to 10. 0 ppm in LSPR sensing. The AgNP-u2013CQD composite shows a more linearity response and a higher sensitivity than bare AgNPs when exposed to chlorophyll, highlighting the possibility of AgNPu2013CQD as a sensing material in this study.

Source link: https://doi.org/10.3390/nano12010035


Potentiometric Carbon Quantum Dots-Based Screen-Printed Arrays for Nano-Tracing Gemifloxacin as a Model Fluoroquinolone Implicated in Antimicrobial Resistance

We present an extraordinary manufacturing process of seven potentiometric screen-printed sensors for the ultra-trace determination of gemifloxacin as a model of the fluoroquinolones antibiotics deeply implicated in the increasing AMR epidemic. Carbon quantum dots synthesized from dextrose were added to Four sensors and improved using a single-step technique. GEMI was successfully determined in pharmaceutical formulations and other water samples with no pretreatment steps that resulted in satisfactory recovery. All sensors have a long life of up to several months and are considered valuable tools for monitoring water quality and effectiveness of water treatment procedures.

Source link: https://doi.org/10.3390/chemosensors9010008


Chlorophyll Detection by Localized Surface Plasmon Resonance Using Functionalized Carbon Quantum Dots Triangle Ag Nanoparticles

The incorporation of amino-functionalized carbon quantum dots and triangle silver nanoparticles was demonstrated for sensitive and selective chlorophyll detection by an optical sensor-based localized surface plasmon resonance sensor. The AgNPs-NCQD composite was produced on the surface of the silanized glass slide using the self-assembly method. With a high correlation coefficient, AgNPs and AgNPs-CQD film-based LSPR sensors performed better than AgNPs and AgNPs-CQD films with a high correlation coefficient, according to the experimental findings. This report demonstrates the applicability of the suggested sensor as a sensing device for chlorophyll detection in oceans.

Source link: https://doi.org/10.3390/nano12172999


Influence of Carbon Quantum Dots on the Biome

The new generation of engineered nanomaterials, viz. , carbon quantum dots, has attracted curiosity because they are made from natural chemical reactions and organic waste matter. The synthesis of these nano-sized particles synthesized from biomass such as fruit peel and other organic matter leads to mixtures of CQD species with varying chemical identity, activity, and photophysical characteristics. Through recent model reports and comment on the knowledge gaps that must be addressed to ensure safe use in agronomy, we explore the current status of CQDs vis-e0-vis their impacts on the biosphere.

Source link: https://doi.org/10.3390/pr8040445


Hemostatic bioactivity of novel Pollen Typhae Carbonisata-derived carbon quantum dots

Background Pollen Typhae Carbonisata is a type of calcined herb drug that has been used as a hemostatic medicine to treat hemostasis for thousands of years. Following PTC-CQDs therapy, the rats' activation of activated partial thromboplastin time and rise in fibrinogen and PLT were also reduced. Conclusions These results showed the clear hemostasis effect of PTC-CQDs, which not only gave a fresh insight into future biomedical and healthcare applications of CQDs in the field of haemorrhage monitoring, but also provided new insight into future drug discovery.

Source link: https://doi.org/10.1186/s12951-017-0296-z


Fabrication of ZnO/Carbon Quantum Dots Composite Sensor for Detecting NO Gas

A hydrothermal process was synthesized by a hydrothermal process, and CQDs were doped into ZnO by a grinding device to produce a ZnO/CQDs composite. The ZnO/CQDs composite has a greater gas sensitivity reaction to NO gas than ZnO microspheres. The sensor's high NO response and NO selectivity in a gas sensitivity analysis of the ZnO/CQDs composite demonstrated that it had a high NO response and NO selectivity. The active functional group offered by CQDs has a major effect on NO gas detection, and the ZnO/CQDs composite's gas detection method is explored.

Source link: https://doi.org/10.3390/s20174961


Colorimetric and Ratiometric Fluorescence Dual-Mode Sensing of Glucose Based on Carbon Quantum Dots and Potential UV/Fluorescence of o-Diaminobenzene

Unlike ODB by itself, ODB oxide not only emits fluorescence, but also induces ultraviolet absorption. Therefore, a CQDs/u207bODB scheme for quantitative oxidation of ODB was developed based on the potential optical characteristics of ODB, glucose oxidase, and horseradish peroxidase. Hydrogen peroxide is a strong oxidant that will rapidly oxidize ODB by horseradish peroxidase catalysis. In addition, this sensor has a high selectivity and can be used for the determination of glucose in serum, giving a new perspective on blood glucose measurement.

Source link: https://doi.org/10.3390/s19030674

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions