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Carbon Dots: Properties and Applications
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Carbon Dots: Properties and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Carbon Materials".

Deadline for manuscript submissions: closed (20 October 2023) | Viewed by 5285

Special Issue Editor

Dr. Junkai Ren

E-Mail Website
Guest Editor
Department of Physics, Umeå University, Linnaeus väg 24, SE-901 87 Umeå, Sweden
Interests: carbon dots; quantum dots; 2D materials; principles of fluorescence spectroscopy; applications of optoelectronic hybrid materials

Special Issue Information

Dear Colleagues,

Carbon dots, as an emerging star in carbon-family nanomaterials, have gained tremendous research interest due to their attractive properties like tunable photoluminescence, high quantum yield, good biocompatibility, as well as low-cost preparation. Carbon dots usually are defined by a characteristic size of < 20 nm and show a quasi-spherical morphology with varying chemical structures and surface functional groups. These excellent physicochemical properties combined with structural characteristics have made carbon dots an ideal platform for diverse applications including light-emitting devices, catalysis, and biomedicine.

This Special Issue aims to provide a comprehensive introduction and discussion of carbon dots following from innovative synthesis to advanced applications. Some key points include but are not limited to controllable synthesis, targeted physiochemical properties, fluorescence mechanisms, functional applications, novel insights, and recent advances. In another hand, it still remains challenging to correlate good relationships between carbon precursors, synthesis conditions, optical properties, etc. Thus, this Special Issue also aims to discuss some critical challenges and possible solutions to address technological and scientific issues in the field of carbon dots.

It is my great pleasure to invite you to submit a manuscript for this Special Issue. Full papers, short communications, perspective and review articles are all welcome.

Dr. Junkai Ren
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. Materials 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 2600 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 dots
  • synthesis methods
  • optical properties
  • fluorescence mechanism
  • advanced characterizations
  • light-emitting devices
  • biomedical applications

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Published Papers (3 papers)

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Research

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11 pages, 4329 KiB  
Communication
Synthesis of Multicolor Carbon Dots Catalyzed by Inorganic Salts with Tunable Nonlinear Optical Properties
by Xiaoqing Niu, Ruipeng Hou, Luo Zhang, Hongli Gao and Junzhou Hu
Materials 2024, 17(1), 42; https://doi.org/10.3390/ma17010042 - 21 Dec 2023
Viewed by 970
Abstract
The nonlinear optical properties of carbon dots have been in the spotlight in recent years. In light of the complexity and diversity of factors affecting the nonlinear optical properties of carbon dots, how to reveal the origin and physical mechanism of the nonlinear [...] Read more.
The nonlinear optical properties of carbon dots have been in the spotlight in recent years. In light of the complexity and diversity of factors affecting the nonlinear optical properties of carbon dots, how to reveal the origin and physical mechanism of the nonlinear optical properties of carbon dots accurately has become a problem. In this work, a template-free method was designed to prepare carbon dots via solid-phase reaction with phloroglucinol as a single carbon source and sodium bisulfate as the catalyst. This method is simple, green, safe, and easy to be prepared on a large scale. Three carbon dots with different luminous colors were obtained by simply adjusting the reaction temperature. The rise of reaction temperature affects the surface functional groups, and then hinders the luminescence of surface states, leading to the change of luminescence properties. The nonlinear optical properties of carbon dots were analyzed by the Z-scan technique. Surprisingly, all carbon dots have nonlinear optical responses, but there are differences in performance. Results prove the increase in sp2 domains may contribute to the significant improvement of the nonlinear optical properties of carbon dots, indicating a direction to improve the nonlinear optical properties of carbon dots. Full article
(This article belongs to the Special Issue Carbon Dots: Properties and Applications)
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16 pages, 3884 KiB  
Article
Rapid Pathogen Purge by Photosensitive Arginine–Riboflavin Carbon Dots without Toxicity
by Selin S. Suner, Venkat R. Bhethanabotla, Ramesh S. Ayyala and Nurettin Sahiner
Materials 2023, 16(19), 6512; https://doi.org/10.3390/ma16196512 - 30 Sep 2023
Cited by 2 | Viewed by 1054
Abstract
Photo-activatable antipathogenic carbon dots (CDs) were prepared by carbonization of citric acid and arginine (Arg) via 3 min microwave treatment for use in the eradication of common microorganisms. Nitrogen-doped Arg CDs were spherical in shape with a size range of 0.5 to 5 [...] Read more.
Photo-activatable antipathogenic carbon dots (CDs) were prepared by carbonization of citric acid and arginine (Arg) via 3 min microwave treatment for use in the eradication of common microorganisms. Nitrogen-doped Arg CDs were spherical in shape with a size range of 0.5 to 5 nm. The Arg CDs were modified with fluorescent dyes, such as fluorescein sodium salt (FSS, as Arg-FSS) and riboflavin (RBF, as Arg-RBF), to improve antimicrobial potency by enhancing their application in photodynamic therapy. The modified Arg CDs afforded fluorescence emission properties at 520 nm in the green region in addition to excellent blue fluorescence intensity at 420 nm under 345 nm excitation upon their FSS and RBF conjugation, respectively. Although the cytotoxicity of Arg CDs was decreased for Arg-RBF CDs to 91.2 ± 0.7% cell viability for fibroblasts, the Arg-based CDs could be safely used for intravenous applications at 1000 μg/mL concentration. The Arg CDs showed broad-spectrum antimicrobial activity against common pathogens and the minimum inhibitory concentration of Arg CDs was almost two-fold decreased for the modified forms without UV light. However, faster and more effective antibacterial activity was determined for photosensitive Arg-RBF CDs, with total bacterial eradication upon UV-A light exposure for 30 min. Full article
(This article belongs to the Special Issue Carbon Dots: Properties and Applications)
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Review

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21 pages, 4931 KiB  
Review
Fluorescent Carbon Dots for Super-Resolution Microscopy
by Xiangcheng Sun and Nazanin Mosleh
Materials 2023, 16(3), 890; https://doi.org/10.3390/ma16030890 - 17 Jan 2023
Cited by 7 | Viewed by 2517
Abstract
Conventional fluorescence microscopy is limited by the optical diffraction of light, which results in a spatial resolution of about half of the light’s wavelength, approximately to 250–300 nm. The spatial resolution restricts the utilization of microscopes for studying subcellular structures. In order to [...] Read more.
Conventional fluorescence microscopy is limited by the optical diffraction of light, which results in a spatial resolution of about half of the light’s wavelength, approximately to 250–300 nm. The spatial resolution restricts the utilization of microscopes for studying subcellular structures. In order to improve the resolution and to shatter the diffraction limit, two general approaches were developed: a spatially patterned excitation method and a single-molecule localization strategy. The success of super-resolution imaging relies on bright and easily accessible fluorescent probes with special properties. Carbon dots, due to their unique properties, have been used for super-resolution imaging. Considering the importance and fast development of this field, this work focuses on the recent progress and applications of fluorescent carbon dots as probes for super-resolution imaging. The properties of carbon dots for super-resolution microscopy (SRM) are analyzed and discussed. The conclusions and outlook on this topic are also presented. Full article
(This article belongs to the Special Issue Carbon Dots: Properties and Applications)
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