Novel graphene oxide/manganese oxide nanocomposites

Jasiński, Jacek B.; Ziółkowska, Dominika A.; Michalska, Monika; Lipińska, L.; Korona, K. P.; Kamińska, M.

doi:10.1039/c3ra42254b

Cited by 18 publications

(10 citation statements)

References 49 publications

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“…6,7 In the last decade, the role of carbon and carbon based nanocomposite materials was vital in leading scientic and industrial research related to nanotechnology. The carbon material such as graphite, fullerene C60, fullerene C540, carbanions, graphene, single walled carbon nanotube (SWCNT) and multi walled carbon nanotube (MWCNT) have been widely used in some important applications such as drug delivery, 8,9 luminescent nanomaterials, 8,10 nanocomposites, [11][12][13][14] and catalysts of chemical reactions 15 owing to their excellent stability, large surface area and thinner thickness. [16][17][18][19] Among these carbon materials, graphene oxide (GO) and GO based nanocomposite materials have garnered interest of several researchers because of its large surface to volume ratio, low cost, unique and electronic properties, mechanical strength, higher optical and thermal properties.…”

Section: Flutamidementioning

confidence: 99%

A facile graphene oxide based sensor for electrochemical detection of prostate anti-cancer (anti-testosterone) drug flutamide in biological samples

et al. 2017

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Section: Flutamidementioning

confidence: 99%

A facile graphene oxide based sensor for electrochemical detection of prostate anti-cancer (anti-testosterone) drug flutamide in biological samples

et al. 2017

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“…Here we propose a plausible formation mechanism of CDs, on the basis of several spectroscopic findings and previously published literature on the thermal decomposition of CA. 42,43 During pyrolysis, CA can decompose to form either 3oxopentanedioic acid or itaconic acid (Scheme 1 and Section S6) by oxidative decarboxylation. The 3-oxopentanedioic acid then undergoes an acid-catalyzed aldol condensation type of reaction to form C. Then C takes part in several coupling and rearrangement reactions to form dimers, trimers, polymers, and ultimately heterogeneously conjugated mature CDs by obeying statistical thermodynamics.…”

Section: Chemistry Of Materialsmentioning

confidence: 99%

Metamorphosis of Ruthenium-Doped Carbon Dots: In Search of the Origin of Photoluminescence and Beyond

Bera

Mondal

et al. 2016

Chem. Mater.

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Carbon dots (CDs) are known to have a wide range of applications, yet our understanding of their structures and chemistry remains uncertain because of their highly complex nanostructured framework. Here we attempt to elucidate the molecular structure and intrinsic mechanisms governing photoluminescence (PL) of CDs by trapping seven visibly distinct colored intermediates that evolved during pyrolytic metamorphosis of citric acid with dopant Ru(III). The "excitation-dependent" PL of doped CDs, Ru:CDs, can be tuned by ethylenediamine (EDA), yielding "excitation-independent" highly fluorescent nanodots, Ru:CNDEDAs. To mimic the optical and chemical properties of CDs, we devise a unique model cocktail comprising multiple fluorogenic molecules that truly supports the existence of chemically switchable conjugated moieties in CDs. We propose a plausible molecular level framework of CDs on the basis of spectroscopic findings and existing literature regarding thermal decomposition of CA. The PL of chemically engineered Ru:CNDEDAs is quenched efficiently by photoinduced electron transfer (PET) phenomenon. By exploiting the PET process, we also develop an important sensing platform for quantifying toxic and carcinogenic quinone derivatives in live HeLa cells that can be used for drug screening. Moreover, the distribution pattern of these photoluminiscent nanodots in HeLa cells is studied to demonstrate their utilities as endosomal markers.

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“…To acquire more precise physical views of the polymer formation mechanism and unique spectroscopic properties of pCDs, we have attempted to simulate a plausible computational model on the basis of our spectroscopic findings and previously published literature on the thermal decomposition of CA. 12,22,23 Acid-catalyzed condensation reactions may create building blocks 1, 2, 3, 4, S6). 12 To construct a 3D model, we have made two assumptions: either (a) those moieties (in our case 1−6) evolved during the metamorphosis of CDs and packed up according to their increasing conjugation, which is partially supported by photobleaching experiment of CDs, indicating layer by layer structure (Figure 3 and Figures S7 and S9) 12 or (b) all of the building blocks (1−6) may be organized randomly in a closed cell of 10 nm (Figures S8 and S10) and mostly the chromphores on the surface of the dots undergo Michel addition reaction with DTT and polymerize accordingly (Figure 3).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Computational Model Of Pcdsmentioning

confidence: 99%

Design and Synthesis of Fluorescent Carbon-Dot Polymer and Deciphering Its Electronic Structure

Bera

Pal

et al. 2018

J. Phys. Chem. C

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Herein, we have reported one-pot synthesis of a fluorescent polymer-like material (pCDs) by exploiting ruthenium doped carbon dot (CDs) as building blocks. The unusual spectral profiles of pCDs with double humped periodic excitation dependent photoluminescence (EDPL) and the regular changes in their corresponding average lifetime indicate the formation of high energy donor states and low energy aggregated states due to the overlap of molecular orbitals throughout the chemically switchable π-network of CDs on polymerization. To probe the electronic distribution of pCDs, we have investigated the occurrence of photoinduced electron transfer with a model electron acceptor, menadione using transient absorption technique, corroborated with low magnetic field, followed by identification of the transient radical ions generated through electron transfer. The experimentally obtained B 1/2 value, a measure of the hyperfine interactions present in the system, indicates the presence of highly conjugated π-electron cloud in pCDs. The mechanism of formation of pCDs and the entire experimental findings have further been investigated through molecular modeling and computational model. The DFT calculations demonstrated the probable electronic transitions from surface moieties of pCDs to the tethered ligands. ASSOCIATED CONTENT Supporting Information Detailed synthetic protocol, additional spectroscopic data, TEM, details of MD-simulations and theoretical calculations are available in supporting information.

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Novel graphene oxide/manganese oxide nanocomposites

Cited by 18 publications

References 49 publications

A facile graphene oxide based sensor for electrochemical detection of prostate anti-cancer (anti-testosterone) drug flutamide in biological samples

A facile graphene oxide based sensor for electrochemical detection of prostate anti-cancer (anti-testosterone) drug flutamide in biological samples

Metamorphosis of Ruthenium-Doped Carbon Dots: In Search of the Origin of Photoluminescence and Beyond

Design and Synthesis of Fluorescent Carbon-Dot Polymer and Deciphering Its Electronic Structure

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