Carbon nanodots crosslinked photoluminescent alginate hydrogels

Wijayapala, Rangana; Hashemnejad, Seyed Meysam; Kundu, Santanu

doi:10.1039/c7ra09805g

Cited by 19 publications

(11 citation statements)

References 32 publications

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“…However, several applications of the gels benefit from the absence of any multivalent metal ions in the hydrogel structure. Various approaches to crosslink alginates without employment of divalent metal ions have been suggested 14 , such as a modified dopamine structure and its oxidative crosslinking 15 , glutaraldehyde crosslinking 16 , photo-crosslinking with anchored methacrylate moieties 17–19 , and amidation of alginate 20 or boronic acid modified alginate 21,22 . However, all these approaches require chemical modification of alginate polymer chains.…”

Section: Introductionmentioning

confidence: 99%

Identification of Molecular Fluorophore as a Component of Carbon Dots able to Induce Gelation in a Fluorescent Multivalent-Metal-Ion-Free Alginate Hydrogel

Kasák

Danko

Zavahir

et al. 2019

Sci Rep

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We introduce a simple approach to fabricate fluorescent multivalent metal ion-free alginate hydrogels, which can be produced using carbon dots accessible from natural sources (citric acid and L-cysteine). Molecular fluorophore 5-oxo-2,3-dihydro-5H-[1,3]-thiazolo[3,2-a] pyridine-3,7-dicarboxylic acid (TPDCA), which is formed during the synthesis of carbon dots, is identified as a key segment for the crosslinking of hydrogels. The crosslinking happens through dynamic complexation of carboxylic acid groups of TPDCA and alginate cages along with sodium ions. The TPDCA derived hydrogels are investigated regarding to their thermal, rheological and optical properties, and found to exhibit characteristic fluorescence of this aggregated molecular fluorophore. Moreover, gradient hydrogels with tunable mechanical and optical properties and controlled release are obtained upon immersion of the hydrogel reactors in solutions of divalent metal ions (Ca2+, Cu2+, and Ni2+) with a higher affinity to alginate.

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Section: Introductionmentioning

confidence: 99%

Identification of Molecular Fluorophore as a Component of Carbon Dots able to Induce Gelation in a Fluorescent Multivalent-Metal-Ion-Free Alginate Hydrogel

Kasák

Danko

Zavahir

et al. 2019

Sci Rep

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“…CNDs were synthesized here by using a solvothermal synthesis method from mphenylenediamine (MPD), where MPD in ethanol was heated at 180 °C for 12 hours inside a PTFE lined autoclave (Figure 1a). 32,33 This method allows us to synthesize a large quantity of CNDs in an inexpensive one-step process. 25 The synthesized CNDs are decorated with amine functional groups.…”

Section: Resultsmentioning

confidence: 99%

“…[44][45][46] The synthesized CNDs are fluorescent active, exhibiting emission maxima at 455 nm correspond to blue color. 32 The fluorescent activity of synthesized CNDs is likely due to their sp 2 π-conjugated structure. 42 Figure 4a displays the UV-vis absorption spectra for CNDs solution and thin film where a slight shift in absorption peak for CNDs thin film is visible.…”

Section: Resultsmentioning

confidence: 99%

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Crosslinked Carbon Nano Dots Membranes for Organic Solvent Nanofiltration

Abbaszadeh¹,

Atkinson²,

Trinh³

et al. 2021

Preprint

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We report a facile synthesis strategy of a membrane active layer consisting of crosslinked carbon nano dots through a layer-by-layer process and the application of these membranes in organic solvent nanofiltration. The synthesized membrane is stable in organic solvents for a long duration, displays tight molecular weight cut off, and fluoresces under UV light, allowing one to capture mechanical failure.

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“… 23 − 25 Phenylenediamine isomers as a nitrogen source precursor to prepare carbon dots using the solvothermal method have been reported in the literature, but there are only a few reports on tunable multicolor emission characteristics obtained from this precursor. 17 , 26 − 28 Full color (red, green, blue) tunable carbon dots were synthesized only from o -, m -, and p -phenylenediamines precursors through the solvothermal method, and their applications in cellular imaging have been reported. 17 Carbon dots synthesized from phenylenediamine isomers have been used to cross-link alginate hydrogels.…”

Section: Introductionmentioning

confidence: 99%

Multicolor Nitrogen-Doped Carbon Quantum Dots for Environment-Dependent Emission Tuning

et al. 2022

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Carbon quantum dots (CQDs) have potential applications in many fields such as light-emitting devices, photocatalysis, and bioimaging due to their unique photoluminescence (PL) properties and environmental benignness. Here, we report the synthesis of nitrogen-doped carbon quantum dots (NCQDs) from citric acid and m -phenylenediamine using a one-pot hydrothermal approach. The environment-dependent emission changes of NCQDs were extensively investigated in various solvents, in the solid state, and in physically assembled PMMA–PnBA–PMMA copolymer gels in 2-ethyl-hexanol. NCQDs display bright emissions in various solvents as well as in the solid state. These NCQDs exhibit multicolor PL emission across the visible region upon changing the environment (solutions and polymer matrices). NCQDs also exhibit excitation-dependent PL and solvatochromism, which have not been frequently investigated in CQDs. Most CQDs are nonemissive in the aggregated or solid state due to the aggregation-caused quenching (ACQ) effect, limiting their solid-state applications. However, NCQDs synthesized here display a strong solid-state emission centered at 568 nm attributed to the presence of surface functional groups that restrict the π–π interaction between the NCQDs and assist in overcoming the ACQ effect in the solid state. NCQD-containing gels display significant fluorescence enhancement in comparison to the NCQDs in 2-ethyl hexanol, likely because of the interaction between the polar PMMA blocks and NCQDs. The application of NCQDs-Gel as a solid/gel state fluorescent display has been presented. This research facilitates the development of large-scale, low-cost multicolor phosphor for the fabrication of optoelectronic devices, sensing, and bioimaging applications.

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Carbon nanodots crosslinked photoluminescent alginate hydrogels

Abstract: Multicolor, fluorescent, stable, alginate hydrogels are synthesized by crosslinking alginate chains with phenylenediamine based carbon nanodots.

Cited by 19 publications

References 32 publications

Identification of Molecular Fluorophore as a Component of Carbon Dots able to Induce Gelation in a Fluorescent Multivalent-Metal-Ion-Free Alginate Hydrogel

Identification of Molecular Fluorophore as a Component of Carbon Dots able to Induce Gelation in a Fluorescent Multivalent-Metal-Ion-Free Alginate Hydrogel

Crosslinked Carbon Nano Dots Membranes for Organic Solvent Nanofiltration

Multicolor Nitrogen-Doped Carbon Quantum Dots for Environment-Dependent Emission Tuning

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