Supramolecular Aggregation of Carbon Nanodots

Song, Run-Wei; Shen, Cheng-Long; Zheng, Guang-Song; Ni, Qing-Chao; Liu, Kai-Kai; Zang, Jin-Hao; Dong, Lin; Lou, Qing; Shan, Chong-Xin

doi:10.1021/acs.nanolett.3c03529

Nano Lett.

2023

DOI: 10.1021/acs.nanolett.3c03529

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Supramolecular Aggregation of Carbon Nanodots

Run-Wei Song,

Cheng-Long Shen,

Guang-Song Zheng

et al.

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2024

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Cited by 5 publications

References 54 publications

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Controllable Dopamine Conjugation Boosts Fluorescence, Biocompatibility, and PET Imaging‐Guided Toxicity Assessment of Polycations

Zhao,

Guo,

et al. 2024

Adv Funct Materials

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As well known in bioactives delivery and cancer/inflammation theranostics, polycations have recently extended their biomedical potentials in reducing visceral fat, embolizing body fluid, modulating blood coagulation, and ameliorating hyperammonemia. However, positive charges that dominate various action mechanisms, often raise risks in biosafety concerns. Also, the lack of intrinsic imaging properties of polycations makes it challenging to uncover their pharmacokinetic profiles in living objects. Herein, dopamine conjugation is demonstrated controllable and highly efficient in boosting the fluorescence or even white color emission of various polycations including hyperbranched poly(amido amine) (HPAA), polyethyleneimine and poly‐L‐lysine. By shielding partial surface positive charges, increasing hydrophobicity, and inducing aqueous self‐assembly, dopamine conjugation can significantly enhance the biocompatibility and decrease the toxicity and immunogenicity of polycations. Furthermore, the catechol‐metal binding interaction facilitates the accessibility of polycation‐based positron emission tomography (PET) probes. Different tissue uptake and biodistributions of gallium‐68‐radiolabeled HPAA before and after dopamine conjugation indicate that PET imaging can be a useful supplement to evaluate the dynamic toxicities of polycations.

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Controllable Dopamine Conjugation Boosts Fluorescence, Biocompatibility, and PET Imaging‐Guided Toxicity Assessment of Polycations

Zhao,

Guo,

et al. 2024

Adv Funct Materials

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Photo‐Induced Fluorescence Discoloration of Carbon Dots for Advanced Dynamic Information Encryption

Liao,

Wu,

et al. 2024

Advanced Optical Materials

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The fluorescence discoloration of carbon dots (CDs) induced by UV irradiation without chemical modification has proved to be difficult to achieve. Herein, the synthesis of UV‐sensitive CDs with photo‐induced discoloration is reported using a heteroatom co‐doped hydrothermal method and the fluorescence of the red‐emitting CDs (R‐CDs) can be tuned under UV irradiation from red to yellow to green, showing a new strategy for simpler and easier modulating the luminescence of CDs. The UV‐induced fluorescence color change of CDs involves the changes of molecular fluorophores and oxygen defects on the surface of CDs under UV irradiation. Results show that the photo‐induced fluorescence discoloration of CDs results in the transformation of part of the internal groups, such as C─O and CO. Based on the unique UV‐induced fluorescence color‐changing property of the R‐CDs, a UV‐sensing film is fabricated, which is expected to be further applied in the field of UV detection. Furthermore, by combining CDs fluorescent ink with binary code and Morse code, it can encrypt and decrypt the information of specific text. This new concept of photo‐induced fluorescence discoloration in CDs provides strong technical support for the next generation of advanced information encryption.

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Achieving Color‐Tunable Solid‐State Fluorescence by Adjusting the Molecular‐State Chromophores on Carbonized Polymer Dots

Li,

Tao,

Liu

et al. 2024

Small Structures

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Carbon dots (CDs) have attracted great interest in recent years due to their excellent fluorescent properties, convenient synthetic methods, and wide availability of source materials. However, although most CDs exhibit excellent luminescent properties in solution, achieving solid‐state fluorescence (SSF) CDs is still difficult due to aggregation‐caused quenching, and realizing color‐tunable SSF‐CDs remains a serious challenge. Herein, the SSF‐carbonized polymer dots (CPDs) are successfully obtained by one‐step hydrothermal of polyethyleneimine (PEI) and citric acid. The photoluminescence centers of these CPDs are molecular‐state chromophores, which are proved as imidazo [1,2‐a] pyridine‐7‐carboxylic acid, 1,2,3,5‐tetrahydro‐5‐oxo‐ (IPCA) derivatives by NMR. Further investigation reveals that the formation and distribution of IPCA derivatives would affect the bandgaps when CPDs particles aggregate, which is also verified by density functional theory calculations. Based on the above conclusion, the blue, green, yellow, and orange SSF CPDs are successfully obtained, and the multicolor and white emission light emitting diodes are effectively fabricated by these CPDs.

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Supramolecular Aggregation of Carbon Nanodots

Cited by 5 publications

References 54 publications

Controllable Dopamine Conjugation Boosts Fluorescence, Biocompatibility, and PET Imaging‐Guided Toxicity Assessment of Polycations

Controllable Dopamine Conjugation Boosts Fluorescence, Biocompatibility, and PET Imaging‐Guided Toxicity Assessment of Polycations

Photo‐Induced Fluorescence Discoloration of Carbon Dots for Advanced Dynamic Information Encryption

Achieving Color‐Tunable Solid‐State Fluorescence by Adjusting the Molecular‐State Chromophores on Carbonized Polymer Dots

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