Blue–green luminescent carbon nanodots produced in a silica matrix

Brito, Jackeline B.; Costa, Tânia Maria Haas; Rodembusch, Fabiano Severo; Konowalow, Anthony Silveira; Reis, Roberto dos; Balzaretti, Naira Maria; Jornada, J. A. H. da

doi:10.1016/j.carbon.2015.04.062

Cited by 14 publications

(5 citation statements)

References 34 publications

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“…FT-IR studies reported here show no contradiction with the literature that shifts in emission maximum often correlated with the increased number of oxidized species on the particle surface which results in a red-shifted PL emission 81 . A comparison of the FT-IR spectra of the three samples reveals that low quantum yield and emission intensity on the other hand correlated with the presence of higher ratio of methyl groups, and domination of C=C bonds as respect to oxygen rich-species 82 , 83 . A surface favoring the interfacial hydrogen bonding between C-Dots, decreases the intensity of the fluorescence emitted from those samples due to decreased inter-particle distance between C-Dot pairs (Fig.…”

Section: Resultsmentioning

confidence: 99%

High-Capacitance Hybrid Supercapacitor Based on Multi-Colored Fluorescent Carbon-Dots

Genç

Alaş

Harputlu

et al. 2017

Sci Rep

256

132

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Multi-colored, water soluble fluorescent carbon nanodots (C-Dots) with quantum yield changing from 4.6 to 18.3% were synthesized in multi-gram using dated cola beverage through a simple thermal synthesis method and implemented as conductive and ion donating supercapacitor component. Various properties of C-Dots, including size, crystal structure, morphology and surface properties along with their Raman and electron paramagnetic resonance spectra were analyzed and compared by means of their fluorescence and electronic properties. α-Manganese Oxide-Polypyrrole (PPy) nanorods decorated with C-Dots were further conducted as anode materials in a supercapacitor. Reduced graphene oxide was used as cathode along with the dicationic bis-imidazolium based ionic liquid in order to enhance the charge transfer and wetting capacity of electrode surfaces. For this purpose, we used octyl-bis(3-methylimidazolium)diiodide (C8H16BImI) synthesized by N-alkylation reaction as liquid ionic membrane electrolyte. Paramagnetic resonance and impedance spectroscopy have been undertaken in order to understand the origin of the performance of hybrid capacitor in more depth. In particular, we obtained high capacitance value (C = 17.3 μF/cm2) which is exceptionally related not only the quality of synthesis but also the choice of electrode and electrolyte materials. Moreover, each component used in the construction of the hybrid supercapacitor is also played a key role to achieve high capacitance value.

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Section: Resultsmentioning

confidence: 99%

High-Capacitance Hybrid Supercapacitor Based on Multi-Colored Fluorescent Carbon-Dots

Genç

Alaş

Harputlu

et al. 2017

Sci Rep

256

132

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“…The most remarkable properties of such OIH materials include chemical stability, suitable dielectric properties, selective ion binding, and ion conducting ability, depending on their organic and inorganic components. Such materials have also been reported as interesting luminescent sources [ 1 , 2 , 3 , 4 , 5 ] and hosts of luminescent species [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. For instance, Severo Rodembusch et al reported for the first time the synthesis of fluorescent hybrid aerogels in the blue–green–yellow region.…”

Section: Introductionmentioning

confidence: 99%

“…In 2015, Brito et al reported the entrapment of blue–green luminescent C-dots in transparent silica. The silica was obtained by pyrolysis of the methyl groups present in the nanometric silica grains [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Optical and Electrical Characterization of Amino-alcohol Based Sol-gel Hybrid Materials

et al. 2020

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This manuscript describes the synthesis and characterization of five new organic–inorganic hybrid (OIH) sol-gel materials that were obtained from a functionalized siloxane 3-glycidoxypropyltrimethoxysilane (GPTMS) by the reaction with the new Jeffamine®, namely three different diamines, i.e., EDR-148, RFD-270, and THF-170, a secondary diamine, i.e., SD-2001, and a triamine, i.e., T-403. The OIH sol-gel materials were characterized by UV-visible absorption spectrophotometry, steady-state photoluminescence spectroscopy, and electrochemical impedance spectroscopy. The reported OIH sol-gel materials showed that, with the exception of the samples prepared with Jeffamine® SD-2001, the transmittance values ranged between 61% and 79%. Regarding the capacitance data, the values reported changed between 0.008 and 0.013 nF cm−2. Due to their optical and electrical properties these new OIH materials show promising properties for applications as support films in an optical sensor area such as fiber sensor devices. Studies to assess the chemical stability of the OIH materials in contact with cement pastes after 7, 14, and 28 days were also performed. The samples prepared with THF–170 and GPTMS, when compared to the samples prepared with RFD-270 and T-403, exhibited improved behavior in the cement paste (alkaline environment), showing promising properties for application as support film in optical fiber sensors in the civil engineering field.

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“…, where light‐emitting centers have been associated with carbon precipitates in the form of subnanometer carbon clusters and/or carbon nanoparticles. The concept of light‐emitting carbon nanoparticles as dominant emission centers in SiO 2 :C nanocomposites attracts increasing attention of researchers . Carbon nanodots (CDs) can be specified as a new class of luminescent nanomaterials with efficient visible light emission .…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydration Procedure of Fumed Silica Precursor on the Formation of Luminescent Carbon Centers in SiO₂:C Nanocomposites

Vasin

Kysil

Ісаєва

et al. 2019

Physica Status Solidi (a)

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The effect of hydration procedure of fumed silica precursor on photoluminescent properties of carbonized silica (SiO2:C) nanocomposite after chemo/thermal treatments is studied. Main structural effect is the formation of chemical bonding of phenyl groups to silica surface via multiple CSiO bonding bridges. Synthesized samples demonstrate very broad photoluminescence (PL) bands in near ultraviolet and visible ranges with maximum intensity dependent on temperature of thermal annealing. Two main trends in luminescence properties are: 1) hydration‐induced blue shift of PL in comparison with PL of unhydrated series; 2) red shift of PL bands with increasing synthesis temperature regardless hydration procedure. Temperature dependent evolution of light emission bands is discussed in terms of surface carbon nanoclusters formation and aggregation processes. It is assumed that blue shift of PL bands in the hydrated series is associated with the decreased surface mobility of carbon atoms and clusters as a result of increased chemical bonding with silica surface that slows down carbon thermally stimulated clusterization/aggregation processes.

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Blue–green luminescent carbon nanodots produced in a silica matrix

Cited by 14 publications

References 34 publications

High-Capacitance Hybrid Supercapacitor Based on Multi-Colored Fluorescent Carbon-Dots

High-Capacitance Hybrid Supercapacitor Based on Multi-Colored Fluorescent Carbon-Dots

Synthesis, Optical and Electrical Characterization of Amino-alcohol Based Sol-gel Hybrid Materials

Effect of Hydration Procedure of Fumed Silica Precursor on the Formation of Luminescent Carbon Centers in SiO₂:C Nanocomposites

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Blue–green luminescent carbon nanodots produced in a silica matrix

Cited by 14 publications

References 34 publications

High-Capacitance Hybrid Supercapacitor Based on Multi-Colored Fluorescent Carbon-Dots

High-Capacitance Hybrid Supercapacitor Based on Multi-Colored Fluorescent Carbon-Dots

Synthesis, Optical and Electrical Characterization of Amino-alcohol Based Sol-gel Hybrid Materials

Effect of Hydration Procedure of Fumed Silica Precursor on the Formation of Luminescent Carbon Centers in SiO2:C Nanocomposites

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Product

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Effect of Hydration Procedure of Fumed Silica Precursor on the Formation of Luminescent Carbon Centers in SiO₂:C Nanocomposites