Photoluminescence properties of l-cysteine-derived carbon dots prepared in non-aqueous and aqueous solvents

Yoshinaga, Taishu; Akiu, Moeka; Iso, Yoshiki; Isobe, Tetsuhiko

doi:10.1016/j.jlumin.2020.117260

Cited by 9 publications

(10 citation statements)

References 51 publications

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“…This behavior was also reflected in the three-dimensional spectrum ( Figure S2 ), which exhibited three emission peaks, one characteristic peak at 450 nm and two weak scattering peaks over 300–400 nm. In addition, the QY of MR-CDs was calculated to be 18%, which was comparable to those of most amino acid-derived CDs reported previously [ 38 , 39 , 40 ].…”

Section: Resultssupporting

confidence: 84%

Carbon Dots Derived from the Maillard Reaction for pH Sensors and Cr (VI) Detection

et al. 2020

Nanomaterials

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The Maillard reaction involves a series of complex reactions; fluorescent compounds have been considered as vital intermediate products of the reaction. In this article, carbon dots (CDs) based on the Maillard reaction (MR-CDs) were prepared with L-tryptophan and D-glucose, and they had excellent photoluminescence stability. MR-CDs showed stable pH-dependence behavior and exhibited an excellent linear response to pH in the range of 4.0–7.5 and 7.5–13.0, respectively. Under the masking effect of sodium fluoride for Fe(III), MR-CDs showed excellent selectivity and sensitivity for Cr (VI). The linear range of Cr(VI) was 0.2–50 μM and the limit of detection was 20 nM. (S/N ≥ 3). Furthermore, MR-CDs were used to detect Cr(VI) in tap water samples. The recoveries were between 95.8% and 98.94%, and RSDs were less than 3.17%.

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Section: Resultssupporting

confidence: 84%

Carbon Dots Derived from the Maillard Reaction for pH Sensors and Cr (VI) Detection

et al. 2020

Nanomaterials

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“…In fact, CDs prepared from d -glucose and l -cysteine in our previous reports did not show the solvatochromic behavior. 31 , 50 , 51 Fluorescence solvatochromism for CDs has recently received a great deal of attention as their color tuning strategy and studied because CDs prepared from an aromatic compound of p -phenylenediamine showed the solvatochromic behavior. 33 , 34 , 52 CDs prepared from aromatic compounds possessed π-conjugated systems, and their emission peaks shifted to longer wavelengths as the solvent polarity increased, that is, positive fluorescence solvatochromism.…”

Section: Resultsmentioning

confidence: 99%

Glycothermally Synthesized Carbon Dots with Narrow-Bandwidth and Color-Tunable Solvatochromic Fluorescence for Wide-Color-Gamut Displays

et al. 2021

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Fluorescent carbon dots (CDs) represent a promising eco-friendly next-generation phosphor. However, most CDs exhibit broad photoluminescence (PL) spectra [full width at half-maximum (fwhm) over 60 nm]; few works on CDs with sharp PL spectra (fwhm less than 40 nm) have been reported. In addition, their syntheses and color tuning require harsh conditions of high temperatures, long reaction times, and high pressures with catalysts. Here, we successfully prepared narrow-bandwidth emissive CDs (fwhm of 27−40 nm) from phloroglucinol in a glycol solvent of 1,2-pentanediol at temperatures as low as 180 °C for a reaction duration of as short as 6 h under ambient conditions without any catalysts via an open reaction system in which dehydration and condensation reactions among phloroglucinol molecules were enhanced. We shifted the emission peak from 463 to 511 nm by selecting seven kinds of solvents with different polarities, that is, emission colors could be tuned from blue to green by taking advantage of fluorescence solvatochromism. The CD-dispersed polymer films showed a similar solvatochromic behavior and sharp PL spectra, verifying the feasibility of applying the CDs to displays with a wide color gamut.

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“…It is clear that Arg CDs have different functional groups such as -OH, -NH 2 , and -COOH that generate positive surface charge up to pH 4 due the protonation of amine groups and negative surface charge due the deprotonation of -COOH groups at pH >5 conditions. It has been reported that many amino acid-based CD derivatives from arginine, lysine, cysteine, histidine, tyrosine, and methionine were prepared and investigated for different types of applications including in catalysis, sensors, bioimaging, and clinical applications because of their environmental friendly nature, small size distribution, low cost, good water dispersity, biocompatibility, excellent photoluminescence ability, and effective antibacterial abilities [18][19][20][21][22]. In this study, an Arg CD was used as a template for in situ preparation of MNPs such as Ag NP and Cu NP to enhance the antimicrobial and potential antiaging activity of Arg CDs.…”

Section: Discussionmentioning

confidence: 99%

“…Especially, amino acids are encouraging precursor materials in the synthesis of N-doped CDs because of their non-toxic, biocompatible, and ecofriendly nature and also can give improved optical and chemical properties to the CDs. In the literature, many N-doped CD derivates from amino acids including arginine, lysine, cysteine, histidine, methionine, tyrosine as green natural sources have been reported [14,[18][19][20][21][22][23]. Some of these studies reported that amino acid-based CDs possess encouraging antimicrobial properties [14,22].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen-Doped Arginine Carbon Dots and Its Metal Nanoparticle Composites as Antibacterial Agent

Suner

Şahiner

Ayyala

et al. 2020

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Nitrogen (N)-doped arginine carbon dots (Arg CD) were successfully synthesized using arginine as the amine source and citric acid as the carbon source via a one-pot green synthesis microwave-assisted technique in 2 min. Ag and Cu nanoparticles (NP) were generated within N-doped Arg CDs as composite Arg-Ag CDs and Arg-Cu CDs to render enhanced antibacterial properties. TEM analysis revealed that Arg CDs are in graphitic structures with d spacing ranging from 0.5 nm to 10 nm. The minimum inhibition concentration (MIC) values of Arg CDs with 6.250 mg/mL were decreased by about 100-fold for Arg-Ag CDs and ten-fold for Arg-Cu CDs with 0.062 and 0.625 mg/mL MIC values against Staphylococcus aureus (S. aureus). The highest antibacterial susceptibility was observed for the Arg-Ag CD composite with 0.125 and 0.312 mg/mL minimum bactericidal concentration (MBC) values against Gram negative S. aureus and Gram positive Escherichia coli (E. coli) bacteria strains, respectively. It was found that the metal NPs within Arg CDs significantly increased the antibacterial properties of CDs making them available in the treatment of infections caused by different bacterial species. Furthermore, Arg-Ag CD and Arg-Cu CD composites were tested for Acetylcholinesterase (AChE, E.C. 3.1.1.7) that break down acetylcholine (ACh) into choline and acetic acid leading to the loss of ACh which plays an essential role as neurotransmitter in Alzheimer disease. It was found that Arg-Cu CDs inhibited 74.9 ± 0.8% and Arg-Ag CDs inhibited 52.1 ± 3.8% of AChE at a 1.82 mg/mL concentration versus no inhibition for Arg-CD. Moreover, the chelating activity of Arg-Cu CDs and Arg-Ag CDs were tested for Fe(II) and it was found that almost 100% chelating was attained at 116 μg composites versus no measurable chelation for bare Arg CDs, suggesting the potential neurodegenerative disease treatment properties of these composite CDs in the brain.

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Photoluminescence properties of l-cysteine-derived carbon dots prepared in non-aqueous and aqueous solvents

Cited by 9 publications

References 51 publications

Carbon Dots Derived from the Maillard Reaction for pH Sensors and Cr (VI) Detection

Carbon Dots Derived from the Maillard Reaction for pH Sensors and Cr (VI) Detection

Glycothermally Synthesized Carbon Dots with Narrow-Bandwidth and Color-Tunable Solvatochromic Fluorescence for Wide-Color-Gamut Displays

Nitrogen-Doped Arginine Carbon Dots and Its Metal Nanoparticle Composites as Antibacterial Agent

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