Carbon nanodot doped in polymer film: Plasmophore enhancement, catalytic amination and white-light generation

Abbas, Farogh; Kumar, Sagar; Pal, Surja Kanta; Panda, Debashis

doi:10.1016/j.molliq.2021.118001

Cited by 5 publications

(7 citation statements)

References 60 publications

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“…To characterize the synthesized molecule, Fourier transform infrared (FT-IR) spectroscopy has been employed first to identify the functional groups in the purified product (Figure S1). As expected, appearance of a very broad IR band ranging from 3700 to 3000 cm –1 is due to stretching vibrations of O–H. However, a visible difference in spectra can be noticed between pyrogallol and the product obtained in the range 3000 to 2750 cm –1 .…”

Section: Resultssupporting

confidence: 74%

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Continuous Making, Stretch Breaking, and Exciton Dynamics of a Red-Emissive Organic Submicrometer-Sized Triangular Pyramid

et al. 2023

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Highly photoluminescent, single-component self-assembly being scalable and sustainable has a profound commercial significance. In this article, the challenges that we address in development of self-assembly of π-conjugated molecules are (i) feeble photoluminescence caused by poor molecular orientational ordering and (ii) costly fluorescent monomer owing to lack of an atom/step/energy economical synthetic method. We have discovered that a bright yellow fluorescent xanthene analog capable of instantly forming self-assembly can be synthesized by a home-built coil-in-spiral reactor using an inexpensive precursor, pyrogallol. Stimuli such as temperature (35 °C), acid fumes, and apolar solvent can trigger the formation of red-emissive self-assembly. In solution orientation of about 13 molecules yielding hydrogen-bonded self-assembly has a direct resemblance with a Coulomb-coupled J-aggregate highlighted in the Kasha model. After photoexcitation, the excited state dynamics of the monomer progress via three pathways: (i) relaxation (2 ± 0.3 ps), (ii) solvation (19.5 ± 3 ps), and (iii) decay (2.5 ns). On the other hand, self-assembly exciton evolves via two pathways: (i) relaxation (81 ± 25 ps) and (ii) decay (∼1 ns). In the solid state, the self-assembly retains the submicron-sized trigonal pyramidal structures by layer-by-layer stacking of triangular plates. This self-assembly doped in polymer even exhibits mechanofluorescence. Our study will pave way the use of this photoluminescent self-assembly for improved performance of organic/sustainable electronics and stretchable electronics.

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Section: Resultssupporting

confidence: 74%

“…It is thus indicative of the presence of higher-order molecular aggregates in polymeric environment. Self-assembly (0.062 mg/mL)-doped PVA/PVP (2%) film has been chosen to study the mechanofluorescence over doped PVDF films due to its stretchability and elasticity. , …”

Section: Resultsmentioning

confidence: 99%

Continuous Making, Stretch Breaking, and Exciton Dynamics of a Red-Emissive Organic Submicrometer-Sized Triangular Pyramid

et al. 2023

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“…Copper chloride, hydrogen peroxide, and sodium hydroxide have been used in an aqueous reaction system to easily create multifunctional copper peroxide (CuO 2 ) nanodots [100,101]. Tis procedure included polyvinylpyrrolidone (PVP) which not only regulates nanodot particle diameter but also supplies the surface functionalization necessary to ensure the excellent stability of nanodots under a physiological environment [102,103]. Teir particle size of about 5 nm allowed for efective accumulation in tumors [102,103].…”

Section: Fenton-reaction Approachmentioning

confidence: 99%

“…Tis procedure included polyvinylpyrrolidone (PVP) which not only regulates nanodot particle diameter but also supplies the surface functionalization necessary to ensure the excellent stability of nanodots under a physiological environment [102,103]. Teir particle size of about 5 nm allowed for efective accumulation in tumors [102,103]. By reacting with water, the created CuO 2 nanodots sparked a chemical change that produced hydrogen peroxide, and the presence of Cu 2+ as catalysts sparked a Fenton-like process that produced the very reactive hydroxyl radicals with hydrogen peroxide acting as the reactant on its own [104].…”

Section: Fenton-reaction Approachmentioning

confidence: 99%

Targeting Tumor Microenvironment by Metal Peroxide Nanoparticles in Cancer Therapy

Mbugua

2022

Bioinorganic Chemistry and Applications

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Solid tumors have a unique tumor microenvironment (TME), which includes hypoxia, low acidity, and high hydrogen peroxide and glutathione (GSH) levels, among others. These unique factors, which offer favourable microenvironments and nourishment for tumor development and spread, also serve as a gateway for specific and successful cancer therapies. A good example is metal peroxide structures which have been synthesized and utilized to enhance oxygen supply and they have shown great promise in the alleviation of hypoxia. In a hypoxic environment, certain oxygen-dependent treatments such as photodynamic therapy and radiotherapy fail to respond and therefore modulating the hypoxic tumor microenvironment has been found to enhance the antitumor impact of certain drugs. Under acidic environments, the hydrogen peroxide produced by the reaction of metal peroxides with water not only induces oxidative stress but also produces additional oxygen. This is achieved since hydrogen peroxide acts as a reactive substrate for molecules such as catalyse enzymes, alleviating tumor hypoxia observed in the tumor microenvironment. Metal ions released in the process can also offer distinct bioactivity in their own right. Metal peroxides used in anticancer therapy are a rapidly evolving field, and there is good evidence that they are a good option for regulating the tumor microenvironment in cancer therapy. In this regard, the synthesis and mechanisms behind the successful application of metal peroxides to specifically target the tumor microenvironment are highlighted in this review. Various characteristics of TME such as angiogenesis, inflammation, hypoxia, acidity levels, and metal ion homeostasis are addressed in this regard, together with certain forms of synergistic combination treatments.

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“…The serendipitous observation of excitation-energy-dependent photoluminescence from nanoscale carbon particles in 2004 has rejuvenated the search for solution-processed, biocompatible, and photoluminescent carbon quantum dots. , There are a vast number of reports on the strategies for the synthesis of such water-soluble, photoluminescent dots, usually termed carbon nanodots (CNDs). − Their potential applications cover the most demanding areas of research in recent times, such as intracellular colocalization, light-emitting diodes, hydrogen gas production, and enhanced photosynthesis. − The photoluminescence of the reported CNDs is highly sensitive to precursors and solvents used in the synthesis method, and the emissions of these CNDs can easily be tuned by the doping of nitrogen, sulfur, and others, yielding a color gamut. − …”

Section: Introductionmentioning

confidence: 99%

Green Switching and Light-Harvesting Abilities of Red-Emissive Carbon Nanodot

et al. 2022

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Over a decade in pursuit of photoluminescent carbon quantum dot has created opportunities and left a huge void in understanding the role of graphitic-N in tuning its emission properties. Among the proposed hypotheses on the origin of their emission properties, an emerging one that suggests the formation of molecular crystals lacks the foundations of molecular transformability. In this article, solvent reactiveness has been found to manipulate the emission properties of the products derived from a one-pot solvothermal reaction. The excellent superimposition of absorption and excitation spectra and excitation-energy-independent emission of green- and red-emissive products are suggestive of their molecular nature. The best-known graphitic-N in the carbon nanodot turns out to be the nitrogen of citrazinic acid. The synthesized emitters exhibit reverse solvatochromism, surfactant-induced aggregation, and electrostatic sequestration at the micellar surface. An unprecedented solvent-directed green switching of the red-emissive product (P R) has been presented here, and the transformed product (P R→G*) shows an uncanny resemblance of spectroscopic properties with the green-emissive product (P G). The products can easily bind to bovine serum albumin and retain their emissive properties in bound state, as signaled by the augmentation of fluorescence properties. Being a hybrid photosynthesis system, the chloroplast–red-emissive product is found to exhibit a markedly higher rate of reduction of ferricyanide than that of chloroplast alone.

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Carbon nanodot doped in polymer film: Plasmophore enhancement, catalytic amination and white-light generation

Cited by 5 publications

References 60 publications

Continuous Making, Stretch Breaking, and Exciton Dynamics of a Red-Emissive Organic Submicrometer-Sized Triangular Pyramid

Continuous Making, Stretch Breaking, and Exciton Dynamics of a Red-Emissive Organic Submicrometer-Sized Triangular Pyramid

Targeting Tumor Microenvironment by Metal Peroxide Nanoparticles in Cancer Therapy

Green Switching and Light-Harvesting Abilities of Red-Emissive Carbon Nanodot

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