Possibility of graphene growth by close space sublimation

Sopinskyy, M. V.; Khomchenko, V. S.; Strelchuk, V. V.; Nikolenko, A. S.; Olchovyk, Genadiy P; Vishnyak, Volodymyr V; Stonis, Viktor V.

doi:10.1186/1556-276x-9-182

Cited by 22 publications

(7 citation statements)

References 23 publications

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“…Moreover, the binding energy of the C-C component of CA20-IBU sample is at 284.4eV (assigned in double C=C bonds) while in the other three samples is at 284.7 eV assigned to hydrocarbons. This is an indication of a pronounced presence of C=C bonds (sp2 hybridization) which are present in IBU [Sopinskyy et al 2014] in the CA20-IBU sample. From the total intensity of the C1s and O1s peaks the atomic ratio O/C can be derived.…”

Section: Xps Analysismentioning

confidence: 83%

Evaluation of mesoporous carbon aerogels as carriers of the non-steroidal anti-inflammatory drug ibuprofen

Eleftheriadis

Filippousi

Tsachouridou

et al. 2016

International Journal of Pharmaceutics

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Towards the development of novel drug carriers for oral delivery of poorly soluble drugs mesoporous aerogel carbons (CAs), namely CA10 and CA20 with different pore sizes (10 and 20nm, respectively), were evaluated. The non-steroidal anti-inflammatory lipophilic compound ibuprofen was incorporated via passive loading. The drug loaded carbon aerogels were systemically investigated by means of High-Resolution Transmission Electron Microscopy (HR-TEM), Nitrogen physisorption studies, X-ray diffraction (XRD), Differential Scanning Calorimetry (DSC), X-ray photon electron spectroscopy (XPS) and ζ-potential studies. In vitro release studies were performed in simulated intestinal fluids reflecting both fasted (FaSSIF) and fed (FeSSIF) state conditions. Cytotoxicity studies were conducted with human intestinal cells (Caco-2). Drug was in an amorphous state in the pores of the carbon carrier as shown from the physicochemical characterization studies. The results showed marked differences in the release profiles for ibuprofen from the two aerogels in the media tested whereas in vitro toxicity profiles appear to be compatible with potential therapeutic applications at low concentrations.

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Section: Xps Analysismentioning

confidence: 83%

Evaluation of mesoporous carbon aerogels as carriers of the non-steroidal anti-inflammatory drug ibuprofen

Eleftheriadis

Filippousi

Tsachouridou

et al. 2016

International Journal of Pharmaceutics

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“…The surveyed spectra of TiO 2 , TiO 2 /rGO and TiO 2 /rGO/Ag indicate the presence of Ti, O, Ag and C elements without any impurities in the prepared hybrid nanostructures (as given in Supporting Information Figure S2 ). The deconvoluted C 1s spectrum of the as-prepared GO sample is shown in Figure 1 c as follows: (i) At 282.55 eV, C bonds with sp 1 carbon atoms [ 37 ], (ii) C=C bonds denote the aromatic sp 2 structure groups present in the GO at 284.66 eV, (iii) the peak at 286.30 eV represents the carboxyl groups (C–O bonds) including epoxy and hydroxyl group [ 38 ]. In the case of the TiO 2 /rGO sample, the deconvoluted XPS peak of the C 1s spectrum shows the four diverse carbon bonds with various binding energies of 283.18 eV, 284.74 eV, 286.07 eV and 288.72 eV.…”

Section: Resultsmentioning

confidence: 99%

Plasmon Effect of Ag Nanoparticles on TiO2/rGO Nanostructures for Enhanced Energy Harvesting and Environmental Remediation

et al. 2022

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We report Ag nanoparticles infused with mesosphere TiO2/reduced graphene oxide (rGO) nanosheet (TiO2/rGO/Ag) hybrid nanostructures have been successfully fabricated using a series of solution process synthesis routes and an in-situ growth method. The prepared hybrid nanostructure is utilized for the fabrication of photovoltaic cells and the photocatalytic degradation of pollutants. The photovoltaic characteristics of a dye-sensitized solar cell (DSSC) device with plasmonic hybrid nanostructure (TiO2/rGO/Ag) photoanode achieved a highest short-circuit current density (JSC) of 16.05 mA/cm2, an open circuit voltage (VOC) of 0.74 V and a fill factor (FF) of 62.5%. The fabricated plasmonic DSSC device exhibited a maximum power conversion efficiency (PCE) of 7.27%, which is almost 1.7 times higher than the TiO2-based DSSC (4.10%). For the photocatalytic degradation of pollutants, the prepared TiO2/rGO/Ag photocatalyst exhibited superior photodegradation of methylene blue (MB) dye molecules at around 93% and the mineralization of total organic compounds (TOC) by 80% in aqueous solution after 160 min under continuous irradiation with natural sunlight. Moreover, the enhanced performance of the DSSC device and the MB dye degradation exhibited by the hybrid nanostructures are more associated with their high surface area. Therefore, the proposed plasmonic hybrid nanostructure system is a further development for photovoltaics and environmental remediation applications.

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“…A graphite standard sample was used for the exact peak position. The binding energies were referenced to the graphitic sp 2 hybridized carbon for C1 s set at 284.4 eV 16 , 24 . The samples for the XPS analysis were prepared inside the glove box.…”

Section: Methodsmentioning

confidence: 99%

Carbon-coated iron nanopowder as a sintering aid for water-atomized iron powder

Manchili

Liu

Hryha

et al. 2022

Sci Rep

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The paper examines the influence of carbon coating on iron nanopowder used as a sintering aid for water-atomized iron powder. Iron nanopowder without such a coating was used as a reference sintering aid to isolate the influence of the carbon coating. Both nanopowder variants were characterised using XPS and HRTEM. The results showed a core–shell structure for both variants. The iron nanopowder is covered by a 3–4 nm thick iron oxide layer, while the carbon-coated iron nanopowder is encapsulated with several nanometric carbon layers. Thermogravimetry conducted in a pure hydrogen environment shows a multipeak behaviour for the carbon-coated iron nanopowder, while a single peak behaviour is observed for the iron nanopowder. Two types of micro/nanobimodal powders were obtained by mixing the nanopowder with water-atomized iron powder. Improved linear shrinkage was observed during sintering when the carbon-coated iron nanopowder was added. This can be explained by the reduction in surface diffusion in the nanopowder caused by the carbon coating, which allows the nanopowder to sinter at higher temperatures and improves densification. Carbon and oxygen analysis, density measurements, optical microscopy and JMatPro calculations were also performed.

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Possibility of graphene growth by close space sublimation

Cited by 22 publications

References 23 publications

Evaluation of mesoporous carbon aerogels as carriers of the non-steroidal anti-inflammatory drug ibuprofen

Evaluation of mesoporous carbon aerogels as carriers of the non-steroidal anti-inflammatory drug ibuprofen

Plasmon Effect of Ag Nanoparticles on TiO2/rGO Nanostructures for Enhanced Energy Harvesting and Environmental Remediation

Carbon-coated iron nanopowder as a sintering aid for water-atomized iron powder

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