Quantum Dots for Fluorescence Imaging

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 2963

Special Issue Editor


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Guest Editor
National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, Tokyo, Japan
Interests: Nanoparticle synthesis, processing and characterization; Laser interaction with nanoparticles; Light absorption and scattering by nanoparticles; Processes of Nanoparticles aggregation, agglomeration and dispersion; Quantum dots.

Special Issue Information

Dear Colleagues,

Quantum Dots (QDs), which were originally identified as tiny semiconductor nanoparticles (with a size of several nanometers), from the moment of their appearance in the literature in the mid-1980s, immediately occupied a very important place in nanoscience and nanotechnology. A special property that determined the success that QDs have enjoyed is the tunable fluorescence (or photoluminescence). The tunable fluorescence of QDs makes them uniquely suited to various applications. In particular, QDs turned out to be indispensable in bioscience and biotechnology, where they are used for fluorescent imaging of various bio-objects (from cells to micro RNA). Of course, fluorescent imaging is not the only application of QDs. They are widely used in CERS, the development of new lasers and ultrasensitive sensors, and many other fields.

However, the concept of a QD as a semiconductor particle has recently undergone a significant change after it turned out that the smallest particles of not only semiconductors but also some metals (such as Ag and Si) have the property of tunable fluorescence. A significant change in the study of QDs occurred with the discovery of carbon QDs, which, in contrast to semiconductor QDs, show low toxicity, have more stable fluorescence, and are significantly cheaper to produce. More recently, research has started to shift towards another new very promising object: graphene QDs.

This Special Issue of Nanomaterials will attempt to cover the most recent findings in QD science and applications. Studies that describe new synthesis methods, fabrication techniques and approaches, characterization techniques, materials as possible candidates for QDs, and properties of different QDs will be considered. Of course, applications of QDs in different fields of science and technology will be welcome.

Prof. Dr. Alexander Pyatenko
Guest Editor

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Keywords

  • quantum dot (QD)
  • fluorescence
  • photoluminescence
  • carbon QDs
  • graphene QDs
  • bioscience
  • biotechnology
  • fluorescent imaging
  • sensor
  • bio application.

Published Papers (1 paper)

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Research

13 pages, 2064 KiB  
Article
Carbon Quantum Dots’ Synthesis with a Strong Chemical Claw for Five Transition Metal Sensing in the Irving–Williams Series
by Anastasia Yakusheva, Anastasia Sayapina, Lev Luchnikov, Dmitry Arkhipov, Gopalu Karunakaran and Denis Kuznetsov
Nanomaterials 2022, 12(5), 806; https://doi.org/10.3390/nano12050806 - 27 Feb 2022
Cited by 3 | Viewed by 2385
Abstract
Carbon quantum dots (CQDs) are an excellent eco-friendly fluorescence material, ideal for various ecological testing systems. Herein, we establish uniform microwave synthesis of the group of carbon quantum dots with specific functionalization of ethylenediamine, diethylenetriamine, and three types of Trilon (A, B and [...] Read more.
Carbon quantum dots (CQDs) are an excellent eco-friendly fluorescence material, ideal for various ecological testing systems. Herein, we establish uniform microwave synthesis of the group of carbon quantum dots with specific functionalization of ethylenediamine, diethylenetriamine, and three types of Trilon (A, B and C) with chelate claws -C-NH3. CQDs’ properties were studied and applied in order to sense metal cations in an aquatic environment. The results provide the determination of the fluorescence quench in dots by pollutant salts, which dissociate into double-charged ions. In particular, the chemical interactions with CQDs’ surface in the Irving–Williams series (IWs) via functionalization of the negatively charged surface were ascribed. CQD-En and CQD-Dien demonstrated linear fluorescence quenching in high metal cation concentrations. Further, the formation of claws from Trilon A, Trilon B, and C effectively caught the copper and nickel cations from the solution due to the complexation on CQDs’ surface. Moreover, CQD-Trilon C presented chelating properties of the surface and detected five cations (Cu2+, Ni2+, Ca2+, Mg2+, Zn2+) from 0.5 mg/mL to 1 × 10−7 mg/mL in the Irving–William’s series. Dependence was mathematically attributed as an equation (ML regression model) based on the constant of complex formation. The reliability of the data was 0.993 for the training database. Full article
(This article belongs to the Special Issue Quantum Dots for Fluorescence Imaging)
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