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Nanomaterials
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Carbon-Based Quantum Dots
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Carbon-Based Quantum Dots

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "2D and Carbon Nanomaterials".

Deadline for manuscript submissions: closed (15 March 2023) | Viewed by 12209

Special Issue Editor

Prof. Dr. Su Chen

E-Mail Website
Guest Editor
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, and Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials, Nanjing Tech University, Nanjing 210009, China
Interests: quantum dots; carbon dots; photonic crystals; inorganic-organic molecular assembly; microfluidic technology; frontal polymerization engineering; functional polymer materials

Special Issue Information

Dear Colleagues,

Carbon-based quantum dots (CQDs), a unique class of nanoparticles with sizes below 10 nm composed of carbon skeleton and surface functional groups, have attracted increasing attention owing to their outstanding properties, such as unique fluorescence and phosphorescence, low toxicity, excellent biocompatibility, ease of surface functionalization, and inexpensive production. These attractive characteristics make CQDs potentially useful in various fields, including optoelectronic devices, anti-counterfeiting, detection and sensors, photocatalysis, biomedicine, etc. Tremendous efforts and progress have been made in this field, while much work is still highly needed, such as developing effective synthetic strategies, avoiding fluorescence quenching during solidification processes, ascertaining chemical structure and luminescence mechanism origin, or extending the applications of CQDs. The interests for this Special Issue include (but are not limited to) the synthesis, general structure, properties, and potential application of CQDs.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

  • Synthesis of CQDs, especially green synthesis of CQDs and large-scale production of CQDs;
  • Surface functionalization of CQDs;
  • General structure study on CQDs, including structure characterizations, theory study, etc.;
  • Optical properties and luminescence mechanism of CQDs;
  • Applications of CQDs, including optoelectronic devices, anti-counterfeiting, detection and sensors, energy storage and conversion, catalysis, and biomedicine.

We look forward to receiving your contributions.

Prof. Dr. Su Chen
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Carbon-based quantum dots
  • Preparation methods
  • Surface functionalization
  • Chemical structure
  • Luminescence and luminescence mechanism
  • Applications

Published Papers (6 papers)

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Editorial

Jump to: Research

2 pages, 158 KiB  
Editorial
Editorial for the Special Issue Entitled “Carbon-Based Quantum Dots”
by Su Chen
Nanomaterials 2023, 13(9), 1465; https://doi.org/10.3390/nano13091465 - 25 Apr 2023
Viewed by 856
Abstract
Carbon-based quantum dots, also known as carbon dots (CDs), are a unique class of carbon-based nanoparticles with sizes below 10 nm [...] Full article
(This article belongs to the Special Issue Carbon-Based Quantum Dots)

Research

Jump to: Editorial

11 pages, 3899 KiB  
Article
Green Synthesis of Carbon Dots and Their Integration into Nylon-11 Nanofibers for Enhanced Mechanical Strength and Biocompatibility
by Xu Chen, Ying Qin, Xinru Song, He Li, Yue Yang, Jiazhuang Guo, Tingting Cui, Jiafei Yu, Cai-Feng Wang and Su Chen
Nanomaterials 2022, 12(19), 3347; https://doi.org/10.3390/nano12193347 - 26 Sep 2022
Cited by 7 | Viewed by 1646
Abstract
Carbon dots (CDs) have been extensively explored to show good optical features, low toxicity, and good biocompatibility. Herein, we report the new synthesis of forsythia-derived CDs (F-CDs) and their incorporation into Nylon-11 nanofibers for improved mechanical properties and biocompatibility. F-CDs are prepared from [...] Read more.
Carbon dots (CDs) have been extensively explored to show good optical features, low toxicity, and good biocompatibility. Herein, we report the new synthesis of forsythia-derived CDs (F-CDs) and their incorporation into Nylon-11 nanofibers for improved mechanical properties and biocompatibility. F-CDs are prepared from a Chinese herb forsythia via a magnetic hyperthermia method in 90 s without the use of any organic solvents. The as-prepared F-CDs with rich surface functional groups can be well embedded into Nylon-11 nanofibers via electrospinning, providing Nylon-11/F-CD nanofiber mats with remarkably enhanced mechanical properties. With the incorporation of F-CDs at 10 wt% into the Nylon-11 nanofiber mats, the tensile strength increases from 7.5 to 16.6 MPa, and the elongation ratio at break increases from 39% to 125%. Moreover, the Nylon-11/F-CD nanofiber mats exhibit excellent cytocompatibility towards L929 fibroblast cells with cell viability of 96%. These findings may guide the development of various CD-embedded nanofiber mats with good mechanical properties and biocompatibility potentially useful for biomedical applications, such as tissue engineering scaffolds or wound dressing. Full article
(This article belongs to the Special Issue Carbon-Based Quantum Dots)
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9 pages, 5000 KiB  
Article
Preparing Colour-Tunable Tannic Acid-Based Carbon Dots by Changing the pH Value of the Reaction System
by Yan Li, Can Liu, Menglin Chen, Yunwu Zheng, Hao Tian, Rui Shi, Xiahong He and Xu Lin
Nanomaterials 2022, 12(17), 3062; https://doi.org/10.3390/nano12173062 - 3 Sep 2022
Cited by 4 | Viewed by 1695
Abstract
Biomass carbon dots (CDs) have the characteristics of being green, nontoxic, inexpensive, and simple to prepare, and they can be used in luminescence-related fields. In this study, red, green, and blue luminescent CDs were synthesised by a simple hydrothermal method under alkaline, neutral, [...] Read more.
Biomass carbon dots (CDs) have the characteristics of being green, nontoxic, inexpensive, and simple to prepare, and they can be used in luminescence-related fields. In this study, red, green, and blue luminescent CDs were synthesised by a simple hydrothermal method under alkaline, neutral, and acidic conditions using TA as carbon source and o-phthalaldehyde as blend. The unique optical properties of these CDs are due to the differences in their degrees of conjugation, which can be controlled by the pH value of the reaction system. These three kinds of biomass CDs have good applications in light-emitting diodes (LEDs). By mixing biomass CDs with epoxy resin, warm, and cold white LEDs with Commission Internationale de l’Elcairage (CIE) coordinates (0.35, 0.36) were successfully constructed on extremely stable multicolour CDs. This study shows that these biomass CDs are a promising material for white LED lighting. Full article
(This article belongs to the Special Issue Carbon-Based Quantum Dots)
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15 pages, 2626 KiB  
Article
Magneto-Luminescent Nanocomposites Based on Carbon Dots and Ferrite with Potential for Bioapplication
by Mariia Stepanova, Aliaksei Dubavik, Arina Efimova, Mariya Konovalova, Elena Svirshchevskaya, Viktor Zakharov and Anna Orlova
Nanomaterials 2022, 12(9), 1396; https://doi.org/10.3390/nano12091396 - 19 Apr 2022
Cited by 5 | Viewed by 2044
Abstract
Multifunctional nanocomposites that combine both magnetic and photoluminescent (PL) properties provide significant advantages for nanomedical applications. In this work, a one-stage synthesis of magneto-luminescent nanocomposites (MLNC) with subsequent stabilization is proposed. Microwave synthesis of magnetic carbon dots (M-CDs) was carried out using precursors [...] Read more.
Multifunctional nanocomposites that combine both magnetic and photoluminescent (PL) properties provide significant advantages for nanomedical applications. In this work, a one-stage synthesis of magneto-luminescent nanocomposites (MLNC) with subsequent stabilization is proposed. Microwave synthesis of magnetic carbon dots (M-CDs) was carried out using precursors of carbon dots and magnetic nanoparticles. The effect of stabilization on the morphological and optical properties of nanocomposites has been evaluated. Both types of nanocomposites demonstrate magnetic and PL properties simultaneously. The resulting MLNCs demonstrated excellent solubility in water, tunable PL with a quantum yield of up to 28%, high photostability, and good cytocompatibility. Meanwhile, confocal fluorescence imaging showed that M-CDs were localized in the cell nuclei. Consequently, the multifunctional nanocomposites M-CDs are promising candidates for bioimaging and therapy. Full article
(This article belongs to the Special Issue Carbon-Based Quantum Dots)
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13 pages, 4552 KiB  
Article
Quantum Dots-Loaded Self-Healing Gels for Versatile Fluorescent Assembly
by Chang Liu, Qing Li, Haopeng Wang, Gefei Wang and Haixia Shen
Nanomaterials 2022, 12(3), 452; https://doi.org/10.3390/nano12030452 - 28 Jan 2022
Cited by 5 | Viewed by 2256
Abstract
From the perspective of applied science, methods that allow the simple construction of versatile quantum dots (QDs)-loaded gels are highly desirable. In this work, we report the self-healing assembly methods for various fluorescent QDs-loaded gels. Firstly, we employed horizontal frontal polymerization (FP) to [...] Read more.
From the perspective of applied science, methods that allow the simple construction of versatile quantum dots (QDs)-loaded gels are highly desirable. In this work, we report the self-healing assembly methods for various fluorescent QDs-loaded gels. Firstly, we employed horizontal frontal polymerization (FP) to fabricate self-healing gels within several minutes using a rapid and energy-saving means of preparation. The as-prepared gels showed pH sensitivity, satisfactory mechanical properties and excellent self-healing properties and the healing efficiency reached 90%. The integration of the QDs with the gels allowed the generation of fluorescent composites, which were successfully applied to an LED device. In addition, by using the self-healing QDs-loaded gels as building blocks, the self-healing assembly method was used to construct complex structures with different fluorescence, which could then be used for sensing and encoding. This work offers a new perspective on constructing various fluorescent assemblies by self-healing assembly, and it might stimulate the future application of self-healing gels in a self-healing assembly fashion. Full article
(This article belongs to the Special Issue Carbon-Based Quantum Dots)
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17 pages, 5575 KiB  
Article
Ultrasonic-Assisted Synthesis of N-Doped, Multicolor Carbon Dots toward Fluorescent Inks, Fluorescence Sensors, and Logic Gate Operations
by Jiali Xu, Kai Cui, Tianyu Gong, Jinyang Zhang, Zhirou Zhai, Linrui Hou, Fakhr uz Zaman and Changzhou Yuan
Nanomaterials 2022, 12(3), 312; https://doi.org/10.3390/nano12030312 - 18 Jan 2022
Cited by 39 | Viewed by 2703
Abstract
Over past decades, the multicolor carbon dots (M-CDs) have attracted enormous attentions due to their tunable photoluminescence and versatile applications. Herein, the nitrogen-doped (N-doped) M-CDs including green, chartreuse, and pink emissive CDs are successfully synthesized by ultrasonic treatment of kiwifruit juice with different [...] Read more.
Over past decades, the multicolor carbon dots (M-CDs) have attracted enormous attentions due to their tunable photoluminescence and versatile applications. Herein, the nitrogen-doped (N-doped) M-CDs including green, chartreuse, and pink emissive CDs are successfully synthesized by ultrasonic treatment of kiwifruit juice with different additive reagents such as ethanol, ethylenediamine, and acetone. Owing to their strong fluorescence upon irradiation with 365 nm UV light, the highly water-soluble M-CDs present great potential in the anticounterfeit field as fluorescent inks. Particularly, the resulting green emission CDs (G-CDs) with excellent fluorescence and stability are applied as a label-free probe model for “on–off” detection of Fe3+. The fluorescence of G-CDs is significantly quenched by Fe3+ through static quenching. The nanoprobe demonstrates good selectivity and sensitivity toward Fe3+ with a detection limit of ~0.11 μM. Besides, the quenched fluorescence of G-CDs by Fe3+ can be recovered by the addition of PO43− or ascorbic acid (AA) into the CDs/Fe3+ system to realize the “off–on” fluorescent process. Furthermore, NOT and IMPLICATION logic gates are constructed based on the selection of Fe3+ and PO43− or AA as the inputs, which makes the G-CD-based sensors utilized as various logic gates at molecular level. Therefore, the N-doped M-CDs hold promising prospects as competitive candidates in monitoring the trace species, applications in food chemistry, anticounterfeit uses, and beyond. Full article
(This article belongs to the Special Issue Carbon-Based Quantum Dots)
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