Surface modification strategy for fluorescence solvatochromism of carbon dots prepared from <i>p</i>-phenylenediamine

Sato, Kohei; Sato, Ryo; Iso, Yoshiki; Isobe, Tetsuhiko

doi:10.1039/c9cc09333h

Cited by 50 publications

(33 citation statements)

References 35 publications

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“… 11 , 30 , 33 − 35 This fluorescence solvatochromism is ascribed to the difference in the dipole moments in the ground state and the excited state; the emission wavelength shifts with the change in polarity of the dispersion media. 30 , 33 − 37 Hence, we can readily tune the desired emission wavelength through selection of the dispersion media. However, to our knowledge, the fluorescence solvatochromism of narrow-bandwidth emissive CDs listed in Table 1 has not yet been reported.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…Carbon nanodots (C-dots) are sub-10 nm fluorescent carbon nanoparticles synthesized from low-cost organic precursors that showcase exciting properties such as biocompatibility, [1] photostability, [2] easy surface functionalization, [3,4] or two-photon (TP) excited emissions. [5][6][7][8] These unique features have generated broad interest in sensing, [9] multimodal bioimaging, [10] photocatalysis, [11] drug delivery, [12] photonics, [13] and recently additive manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Molecular Insights of Carbon Nanodots Formation and Their Two‐Photon Emission Properties

Naskar

Wagner

Räder

et al. 2021

Advanced Photonics Research

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The structure formation of carbon nanodots (C-dots) prepared from three different organic precursors is discussed at the molecular level. During microwave synthesis, organic chromophores associated with C-dot structures are formed that exhibit distinct optical features. The molecular structure of these fluorophores is elucidated and their optical properties with and without the C-dots are investigated. The emergence of two-photon emission is observed and correlated with the hybridization state of the carbon atoms within the C-dot as well as the formation of the fluorophores. Varying contents of sp 2 -and sp 3 -hybridization in different C-dots also affect their one-photon and two-photon emission characteristics. Understanding the molecular structure of the carbon nanocore and the organic fluorophores formed in C-dots would enable rational design of C-dots with improved optical features, which would be of great relevance for their applications, for example, in bioimaging.

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“…If electrically neutral molecules have a larger dipole moment in the excited state than in the ground state, the excited state becomes more stabilized with increasing solvent polarity. 36 The excited states of the compounds are mainly affected by the polarity, refractive index as well as dielectric constants of solvents and also, by the solvation effect of solvents towards compounds. 37 The differences observed between acetonitrile and water could be attributed to factors such as hydrogen bonding.…”

Section: Titration Studies Of S1 In the Presence Of Fe 3+mentioning

confidence: 99%

Synthesis and application of a fluorescent “turn-off” triazolyl-coumarin-based fluorescent chemosensor for the sensing of Fe3+ ions in aqueous solutions

Mama¹,

Battison²

2020

Arkivoc

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Two coumarin derivatives containing triazole moieties have been synthesized using "click chemistry" protocol and investigated as chemosensors for the detection of metal ions. These compounds displayed a strong preference for Fe 3+ ions with complexation resulting in fluorescent quenching. The detection limit of the preferred chemosensor was determined to be 1.4 µM. The preferred triazole-coumarin compound showed greater selectivity towards Fe 3+ in the presence of competing metal cations. Binding stoichiometry between this triazole-coumarin and Fe 3+ was shown to occur in a 1:1 ratio between the chemosensor and metal cation. The binding site of Fe 3+ to the triazole-coumarin was determined using 1 H NMR, 13 C NMR and molecular modeling studies.

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Surface modification strategy for fluorescence solvatochromism of carbon dots prepared from p-phenylenediamine

Abstract: Surface modification of p-phenylenediamine-derived carbon dots with decanoic acid and perfluorodecanoic acid successfully modulated fluorescence solvatochromism.

Cited by 50 publications

References 35 publications

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

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

Molecular Insights of Carbon Nanodots Formation and Their Two‐Photon Emission Properties

Synthesis and application of a fluorescent “turn-off” triazolyl-coumarin-based fluorescent chemosensor for the sensing of Fe3+ ions in aqueous solutions

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