Luminescent assays based on carbon dots for inorganic trace analysis

2015 ◽  
Vol 34 (3-4) ◽  
Author(s):  
Isabel Costas-Mora ◽  
Vanesa Romero ◽  
Isela Lavilla ◽  
Carlos Bendicho
Keyword(s):  
Quantum Dots ◽  
Trace Analysis ◽  
Carbon Dots ◽  
Chemical Species ◽  
Promising Alternative ◽  
Organic Fluorophores ◽  
Optical Nanoprobes ◽  
Fluorescent Nanomaterials

AbstractCarbon dots (CDs) are a recently discovered class of fluorescent nanomaterials with great potential to be applied in the analytical field. CDs have demonstrated to be a promising alternative to conventional organic fluorophores or quantum dots as optical nanoprobes for sensing different chemical species. In this overview, we review the progress in the design of novel nanoprobes based on fluorescent CDs for inorganic trace analysis. Representative examples of CD-based assays are described and the different sensing strategies are discussed.

Implications of surface passivation on physicochemical and bioimaging properties of carbon dots

RSC Advances ◽  
2014 ◽  
Vol 4 (40) ◽  
pp. 20915-20921 ◽  
Author(s):  
Abhay Sachdev ◽  
Ishita Matai ◽  
P. Gopinath
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Surface Passivation ◽  
Fluorescence Properties ◽  
Promising Alternative

The prevalence of surface functionalized carbon dots (CDs) with intriguing fluorescence properties has given a new dimension to the field of bioimaging and is perceived as a promising alternative to quantum dots (QDs).

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.

Amino-functionalized Fluorescent Carbon Dots for Chemical Sensing

MRS Advances ◽  
2016 ◽  
Vol 1 (19) ◽  
pp. 1365-1370 ◽  
Author(s):  
Jingjing Dai ◽  
Michael Zambrana ◽  
Maria Fidalgo
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Low Cost ◽  
Environmental Water ◽  
Nitroaromatic Compounds ◽  
Fluorescent Nanoparticles ◽  
Promising Alternative ◽  
Molecularly Imprinted ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

ABSTRACTQuantum dots have been applied in sensing with success, but their use in environmental applications has been questioned due to their heavy metal content. Carbon dots are fluorescent nanoparticles that offer a promising alternative to quantum dots for sensing, due to their low cost, benign fabrication process and negligible environmental impact. Fluorescence sensors are specially suited for detection of nitroaromatic compounds such as 2,4,6-trinitrotoluene (TNT) and 2,4-dinitrotoluene (DNT), since they can quench the emission of excited species. When combined to Molecularly Imprinted Polymers (MIPs), the sensors become specific to the imprinted target molecules. Amino-functionalized carbon dots (CDs) with high photoluminescence were fabricated. The CDs were characterized with respect to their surface charge, surface chemistry, particle size distribution, and photoluminescence properties (PL). A molecularly imprinted polymer with template of DNT was combined with fluorescent carbon dots via a simple covalent reaction. The ability of aqueous DNT to quench amino CDs fluorescence was tested for concentrations in the range of 1mM to 50 mM. It can be concluded that the amino carbon dots can be used in fluorescent-labeled MIP systems and that they provide a feasible method for the detection of DNT, and potentially other nitroaromatic compounds, in environmental water samples.

scholarly journals An Overview of the Recent Developments in Carbon Quantum Dots—Promising Nanomaterials for Metal Ion Detection and (Bio)Molecule Sensing

Chemosensors ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 138
Author(s):  
Silvija Šafranko ◽  
Dominik Goman ◽  
Anamarija Stanković ◽  
Martina Medvidović-Kosanović ◽  
Tihomir Moslavac ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Metal Ion ◽  
Water Solubility ◽  
Wide Spectrum ◽  
Low Cost ◽  
Chemical Species ◽  
Carbon Quantum Dots ◽  
Recent Developments ◽  
Metal Ion Detection

The fluorescent carbon quantum dots (CQDs) represent an emerging subset of carbonaceous nanomaterials, recently becoming a powerful tool for biosensing, bioimaging, and drug and gene delivery. In general, carbon dots are defined as zero-dimensional (0D), spherical-like nanoparticles with <10 nm in size. Their unique chemical, optical, and electronic properties make CQDs versatile materials for a wide spectrum of applications, mainly for the sensing and biomedical purposes. Due to their good biocompatibility, water solubility, and relatively facile modification, these novel materials have attracted tremendous interest in recent years, which is especially important for nanotechnology and nanoscience expertise. The preparation of the biomass-derived CQDs has attracted growing interest recently due to their low-cost, renewable, and green biomass resources, presenting also the variability of possible modification for the enhancement of CQDs’ properties. This review is primarily focused on the recent developments in carbon dots and their application in the sensing of different chemical species within the last five years. Furthermore, special emphasis has been made regarding the green approaches for obtaining CQDs and nanomaterial characterization toward better understanding the mechanisms of photoluminescent behavior and sensing performance. In addition, some of the challenges and future outlooks in CQDs research have been briefly outlined.

Highly luminescent InP-In(Zn)P/ZnSe/ZnS core/shell/shell colloidal quantum dots with tunable emission synthesized based on growth-doping

2021 ◽  
Author(s):  
Cong Shen ◽  
Yan Qing Zhu ◽  
Zixiao Li ◽  
Jingling Li ◽  
Hong Tao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Infrared Region ◽  
Colloidal Quantum Dots ◽  
High Quality ◽  
Promising Alternative ◽  
Lower Toxicity ◽  
Near Infrared Region ◽  
Inp Quantum Dots ◽  
Tunable Emission

InP quantum dots (QDs) are considered as the most promising alternative to Cd-based QDs with the lower toxicity and emission spectrum tunability ranging from visible to near-infrared region. Although high-quality...

scholarly journals Distinct Chemistries Define the Diverse Biological Effects of Plasma Activated Water Generated with Spark and Glow Plasma Discharges

2021 ◽  
Vol 11 (3) ◽  
pp. 1178
Author(s):  
Evanthia Tsoukou ◽  
Maxime Delit ◽  
Louise Treint ◽  
Paula Bourke ◽  
Daniela Boehm
Keyword(s):  
Mammalian Cells ◽  
Biomedical Application ◽  
Biological Effects ◽  
Mode Of Delivery ◽  
Chemical Species ◽  
Resistant Bacteria ◽  
Cytotoxic Activities ◽  
Promising Alternative ◽  
Plasma Activated Water

The spread of multidrug-resistant bacteria poses a significant threat to human health. Plasma activated liquids (PAL) could be a promising alternative for microbial decontamination, where different PAL can possess diverse antimicrobial efficacies and cytotoxic profiles, depending on the range and concentration of their reactive chemical species. In this research, the biological activity of plasma activated water (PAW) on different biological targets including both microbiological and mammalian cells was investigated in vitro. The aim was to further an understanding of the specific role of distinct plasma reactive species, which is required to tailor plasma activated liquids for use in applications where high antimicrobial activity is required without adversely affecting the biology of eukaryotic cells. PAW was generated by glow and spark discharges, which provide selective generation of hydrogen peroxide, nitrite and nitrate in the liquid. The PAW made by either spark or glow discharges showed similar antimicrobial efficacy and stability of activity, despite the very different reactive oxygen species (ROS) and reactive nitrogen species profiles (RNS). However, different trends were observed for cytotoxic activities and effects on enzyme function, which were translated through the selective chemical species generation. These findings indicate very distinct mechanisms of action which may be exploited when tailoring plasma activated liquids to various applications. A remarkable stability to heat and pressure was noted for PAW generated with this set up, which broadens the application potential. These features also suggest that post plasma modifications and post generation stability can be harnessed as a further means of modulating the chemistry, activity and mode of delivery of plasma functionalised liquids. Overall, these results further understanding on how PAL generation may be tuned to provide candidate disinfectant agents for biomedical application or for bio-decontamination in diverse areas.

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.

scholarly journals Tunable Quantum Photoinitiators for Radical Photopolymerization

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2694
Author(s):  
Shubhangi Shukla ◽  
Prem C. Pandey ◽  
Roger J. Narayan
Keyword(s):  
Quantum Dots ◽  
Metal Oxides ◽  
Radical Polymerization ◽  
Mechanism Of Action ◽  
Carbon Dots ◽  
Semiconductor Nanocrystals ◽  
Metal Sulfides ◽  
Cross Linking ◽  
Reversible Deactivation ◽  
Reversible Deactivation Radical Polymerization

This review describes the use of nanocrystal-based photocatalysts as quantum photoinitiators, including semiconductor nanocrystals (e.g., metal oxides, metal sulfides, quantum dots), carbon dots, graphene-based nanohybrids, plasmonic nanocomposites with organic photoinitiators, and tunable upconverting nanocomposites. The optoelectronic properties, cross-linking behavior, and mechanism of action of quantum photoinitiators are considered. The challenges and prospects associated with the use of quantum photoinitiators for processes such as radical polymerization, reversible deactivation radical polymerization, and photoinduced atom transfer radical polymerization are reviewed. Due to their unique capabilities, we forsee a growing role for quantum photoinitiators over the coming years.

Harnessing Versatile Dynamic Carbon Precursors for Multi-Color Emissive Carbon Dots

2022 ◽  
Author(s):  
Zitong Wei ◽  
Wenyi Lu ◽  
Ximin Wang ◽  
Jiping Ni ◽  
Umme Hani Prova ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Carbon Dots ◽  
High Quantum Yield ◽  
Carbon Allotrope ◽  
High Quantum ◽  
Fluorescent Nanomaterials

Carbon dots (CDs), a relatively new kind of fluorescent nanomaterials superior to other contributors of carbon allotrope due to their excellent biocompatibility, controllable photoluminescence, high quantum yield (QY), unique electronic...

Sign in / Sign up

Export Citation Format

Share Document