Surface amino group modulation of carbon dots with blue, green and red emission as Cu2+ ion reversible detector

Zhao, Qingling; Li, Xiang; Wang, Xiaotong; Zang, Zehao; Liu, Heyan; Li, Lanlan; Yu, Xiaofei; Yang, Xiaojing; Lu, Zunming; Zhang, Xinghua

doi:10.1016/j.apsusc.2022.153892

Cited by 22 publications

(20 citation statements)

References 61 publications

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“…1 Even though amino functionalization could not significantly red-shift the absorption peak of the CDs, amino functionalization on the CDs still becomes the preferable functional group for any application due to their excellent charge transfer. 26,44,45…”

Section: Resultsmentioning

confidence: 99%

“…Later, reports on utilizing various functional groups to tailor the CDs' properties became more frequent. 1,26–28 Kundelev et al investigated the effect of amino functional groups (–NH 2 ) on CDs' electronic and optical properties through a Density Functional Theory (DFT) study. 1 The presence of amino functional groups on the CDs' surfaces could affected the shift in the emission spectrum of CDs.…”

Section: Introductionmentioning

confidence: 99%

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Revealing the synergetic interaction between amino and carbonyl functional groups and their effect on the electronic and optical properties of carbon dots

Santika

Permatasari

Umami

et al. 2022

Phys. Chem. Chem. Phys.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Revealing the synergetic interaction between amino and carbonyl functional groups and their effect on the electronic and optical properties of carbon dots

Santika

Permatasari

Umami

et al. 2022

Phys. Chem. Chem. Phys.

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“…30 Zwitterionic and polyfunctional AAs can be variously charged depending on pH and equipped with hydrophilic (hydroxy −OH or mercapto −SH groups) or hydrophobic (aliphatic and/or aromatic) moieties, which, in turn, provides tunability of the optical properties of CQDs. 31,32 Here, we propose a facile and sustainable one-step hydrothermal synthesis of CQDs from various AAs (hydrophilic, hydrophobic, aromatic, and aliphatic) and citric acid (CA) as the precursors of the core and shell, respectively. Our method covers a fully controlled four-stage synthesis, that is, dehydration, polymerization, passivation, and carbonization.…”

Section: ■ Introductionmentioning

confidence: 99%

“…AAs are renewable, abundant (global volume of the AA market reached 10.3 MT in 2021), relatively inexpensive (110–1300 USD kg –1 ), and non-toxic . Zwitter-ionic and polyfunctional AAs can be variously charged depending on pH and equipped with hydrophilic (hydroxy −OH or mercapto −SH groups) or hydrophobic (aliphatic and/or aromatic) moieties, which, in turn, provides tunability of the optical properties of CQDs. , …”

Section: Introductionmentioning

confidence: 99%

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Carbon Quantum Dots from Amino Acids Revisited: Survey of Renewable Precursors toward High Quantum-Yield Blue and Green Fluorescence

et al. 2022

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Carbon quantum dots (CQDs) were synthesized via a green, one-step hydrothermal method. As CQD precursors, nine amino acids of different structural descriptors (negatively/positively charged in water, polar, hydrophobic, sulfur-containing, and other/complex ones) were surveyed: Asp, Cys, Gly, His, Leu, Lys, Phe, Pro, and Ser. The reactions were performed in an autoclave in the presence of citric acid at 180 °C for 24 h and yielded core–shell CQDs. CQDs were comprehensively characterized by transmission electron microscopy, dynamic light scattering, Raman, UV/Vis, infrared, X-ray photoelectron spectroscopy, and fluorescence spectroscopy. At the excitation wavelength of λex = 350 nm, Cys-, Phe-, Leu-, and Lys-based CQDs displayed the highest quantum yield blue fluorescence90 ± 5, 90 ± 4, 87 ± 5, and 67 ± 3%, respectivelysuperior to the conventional fluorescent dyes. Strikingly, for Lys- and Phe-CQDs, dissimilar trends in the excitation–emission wavelength relationships were identified, that is, constantly strong red shifts versus excitation wavelength-independent emission. Cys- and Lys-CQDs were water-dispersible toward the narrow unimodal distribution of hydrodynamic diameters0.6 and 2.5 nm, respectively. Additionally, Lys- and Cys-CQDs, with high absolute zeta potential values, formed stable aqueous colloids in a broad range of pH (2, 7, and 12). The results constitute important premises for water-based applications of CQDs, such as bioimaging or photocatalysis.

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Deep‐Red to Near‐Infrared Carbon Dots in Biosensing and Bio‐medical Applications

Huang

Chen

et al. 2023

Chin. J. Chem.

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Comprehensive SummaryWith the rapid development in the field of biomedical diagnosis and treatment, carbon dots (CDs) with favorable photostability, biocompatibility and high quantum yields for deep‐red to near‐infrared emission have attracted the attention of a majority of researchers. By enlarging the sp2 domain in the core of CDs, doping them with heteroatoms like nitrogen and sulfur, applying hydrothermal, electrochemical, or microwave‐assisted techniques, CDs can be made with the aforementioned photoemission capabilities. In view of these excellent properties, CDs are flourishing in biosensing and biomedical applications, so that a thorough description and discussion of this topic is beneficial to capture the up‐to‐date progress of CDs in this field, providing suggestions and considerations for readers.

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Surface amino group modulation of carbon dots with blue, green and red emission as Cu2+ ion reversible detector

Cited by 22 publications

References 61 publications

Revealing the synergetic interaction between amino and carbonyl functional groups and their effect on the electronic and optical properties of carbon dots

Revealing the synergetic interaction between amino and carbonyl functional groups and their effect on the electronic and optical properties of carbon dots

Carbon Quantum Dots from Amino Acids Revisited: Survey of Renewable Precursors toward High Quantum-Yield Blue and Green Fluorescence

Deep‐Red to Near‐Infrared Carbon Dots in Biosensing and Bio‐medical Applications

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